What Does It Mean?

This generic powertrain diagnostic trouble code (DTC) generally applies to all OBD-II equipped vehicles with a clutch pedal. This may include, but is not limited to, vehicles from Jaguar, Dodge, Chrysler, Chevy, Saturn, Pontiac, Vauxhall, Ford, Cadillac, GMC, Nissan, etc. Although generic, specific repair steps may vary by make/model.

The OBD-II fault code P0835 is associated with the “B” circuit of the clutch pedal switch. When the Powertrain Control Module (PCM) detects a malfunction in the “B” clutch pedal switch circuit, also referred to as the clutch position sensor or clutch start switch circuit, a number of different codes can be set.

These codes are P0830, P0831, P0832, P0833, P0834, P0835, and P083F depending on the specific malfunction that alerts the PCM to set the code and illuminate the Check Engine light.

The “B” clutch pedal switch circuit functions to monitor the position of the clutch pedal. This process is accomplished by reading the output voltage from the clutch position sensor. The clutch position sensor switch design can vary from one vehicle to another; it is typically a basic “on/off” switch mounted near the clutch pedal on the bracket. Regardless of design, a constant voltage is typically present on one side of the switch, and the contacts are closed by engaging the clutch pedal to transfer voltage to the starter or starter solenoid. This basic circuit and switch prevent the engine from starting before the clutch is engaged.

Code P0835 Clutch Pedal Switch Circuit B High is set by the PCM when the “B” clutch pedal switch circuit experiences a high voltage situation. Refer to a vehicle-specific repair manual to determine which is the “B” circuit for your particular vehicle.

How Severe Is This DTC?

The severity of this code is normally moderate, but it can be severe if the vehicle starts with the clutch disengaged, creating a safety issue.

What Are Some of the Symptoms of the Code?

Symptoms of a P0835 engine code may include:

Engine does not start
Engine starts without engaging the clutch
Check Engine light illuminated

What Are Some of the Possible Causes of the Code?

• Causes

  of this code may include:

• Faulty clutch position sensor switch
• Blown fuse or fuse link (if applicable)
• Corroded or damaged connector
• Faulty or damaged wiring
• Faulty PCM

What Are the P0835 Troubleshooting Steps?

The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and powertrain. In some circumstances, this can save a lot of time in the long run by pointing you in the right direction.

The second step is to locate the clutch position sensor switch and look for obvious physical damage. Perform a thorough visual inspection to check that the associated wiring does not have obvious defects such as scraping, rubbing, bare wires, or burn marks. Then, check the connectors and connections for security, corrosion, and damaged pins. This process should include all wiring connectors and connections to the clutch position sensor switch, PCM, starter, and starter solenoid. Consult vehicle-specific technical data to see if a fuse or fuse link is incorporated into the circuit.
Advanced Steps

Advanced steps become very vehicle-specific and require appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and vehicle-specific technical references. Voltage requirements will be highly based on the specific year and model of the vehicle.
Voltage Checks

When the clutch is disengaged, there should be an appropriate 12-volt voltage on one side of the switch. When the clutch is engaged, you should have voltage on both sides of the switch. The starter solenoid or starter should also be powered depending on the configuration.

If this process identifies the absence of a power source or ground, continuity tests may be required to check the integrity of the wiring and the clutch position sensor switch.

When the clutch is engaged, you should have continuity through the switch, and when the clutch is released, the meter should indicate no continuity through the switch. Continuity tests should always be performed with the power disconnected from the circuit, and normal readings for wiring and connections should be 0 ohms of resistance, unless otherwise indicated by technical data. Resistance or lack of continuity is an indication of faulty wiring that is open or shorted and must be repaired or replaced.

What Are the Common Repairs?

• Replacing the clutch position sensor
• Replacing a blown fuse or fuse link (if applicable)
• Cleaning corrosion from connectors
• Repairing or replacing wiring
• Programming or replacing the PCM

  Common Mistakes

  Replacing the starter or solenoid when the clutch position sensor, damaged wiring, or a faulty connector is the cause.

  I hope the information in this article has been helpful in guiding you in the right direction to correct the issue with the “B” clutch pedal switch circuit fault code. This article is strictly informational, and specific technical data and service bulletins for your vehicle should always take priority.

🚗 Code P0836: 4WD Switch Circuit – Complete Guide

📌 Meaning:
Malfunction detected in the four-wheel drive (4WD) switch circuit or the transfer case.

• Generic Description: “Voltage/resistance issue in the 4WD switch circuit”.
• Affected System: Transfer case, PCM/TCM, switches, wiring.

⚠️ Severity:

• Moderate to High:
• Risk of locking in 4WD Low → Severe mechanical stress.
• Vehicle may remain immobile or experience abrupt gear changes.

🚨 Common Symptoms:

• 4WD or Check Engine light illuminated.
• Stuck transfer case (e.g., in 4L or Neutral position).
• Inability to engage/disengage 4WD.
• Harsh gear shifts.

🔍 Possible Causes:

1. Faulty 4WD switch.
2. Damaged wiring (short circuits, broken wires, corrosion).
3. Transfer case issues (often related to solenoids).
4. Faulty electrical connections (loose, corroded connectors).
5. Blown fuse or poor grounding.
6. Failing PCM/TCM (rare).

🔧 Troubleshooting: Basic Steps

1. Check TSBs (Technical Service Bulletins) for your model/year.
2. Check fluid levels:

• Transmission/transfer case fluid (condition and quantity).

1. Visual inspection:

• Wiring (chafing, burns, exposed wires).
• Connectors (corrosion, bent pins).
• Fuses and ground connections.

⚙️ Advanced Troubleshooting:

1. Test voltage/resistance with a multimeter:

• Compare with manufacturer’s reference values.

1. Wiring continuity:

• Check for breaks or short circuits (resistance ≈ 0 Ω).

1. PCM/TCM control:

• Software update or replacement if necessary.

🛠️ Common Repairs:

• Replace the 4WD switch or solenoid.
• Repair damaged wiring or replace corroded connectors.
• Clean/tighten ground connections.
• Replace blown fuse.
• Reprogram the PCM/TCM (if software is corrupted).

❌ Common Mistake:

⚠️ Do not replace the transfer case without checking the wiring!

• A simple faulty wire or poor connection can trigger this code.

💡 Final Tip:
Always consult a specific technical manual or professional diagnostic tool (e.g., Tech2, Delphi) for accurate data tailored to your vehicle.

Need more help? Share your vehicle’s make and year! 🔧🚙

🔧 Code P0837: 4×4 Switch Circuit – Complete Guide

📌 Meaning

Code P0837 indicates a malfunction in the 4×4 switch circuit (four-wheel drive), typically related to abnormal voltage or resistance detected by the PCM/TCM.

• Generic Description: “Signal out of range in the 4×4 switch circuit”.
• Affected System: Transfer case, 4×4 switch, wiring, PCM/TCM.

⚠️ Severity

• Moderate to Critical:
  • Risk of locking in 4×4 low → Mechanical stress on the transmission.
  • Vehicle may become immobile or experience abrupt gear changes.

🚨 Common Symptoms

• 4×4 or Check Engine light illuminated.
• Transfer case stuck (e.g., in 4L or Neutral position).
• Inability to engage/disengage 4×4.
• Jerky transmission or reluctance to shift gears.

🔍 Possible Causes

1. Faulty 4×4 switch.
2. Damaged wiring (short circuits, cut wires, corrosion).
3. Transfer case malfunction (often related to solenoids).
4. Electrical issues:
   • Oxidized connectors, blown fuse, poor grounding.
5. Failing PCM/TCM (rare, check last).

🔧 Troubleshooting: Basic Steps

1. Consult TSBs (Technical Service Bulletins) for your vehicle.
2. Check levels:
   • Transmission/transfer case fluid (level and quality).
3. Visual inspection:
   • Wiring (chafing, burns, exposed wires).
   • Connectors (corrosion, bent pins).
   • Fuses and ground connections.

⚙️ Advanced Troubleshooting

1. Test the 4×4 switch:
   • Measure resistance with a multimeter (compare to manufacturer specifications).
2. Check voltage:
   • Verify power and ground of the circuit (electrical diagram required).
3. Continuity test:
   • Wiring between the switch, transfer case, and PCM/TCM (resistance ≈ 0 Ω).
4. PCM/TCM diagnosis:
   • Use a professional OBD-II scanner (e.g., Snap-On, Autel) to check live data.

🛠️ Common Repairs

• Replace the 4×4 switch or transfer case solenoid.
• Repair damaged wiring or replace corroded connectors.
• Clean/tighten ground connections.
• Replace blown fuse.
• Reprogram the PCM/TCM (if software is corrupted).

❌ Common Mistake

⚠️ Do not replace the transfer case without checking the wiring!

• A cut wire or poor connection can trigger this code.

💡 Technical Tip:
Use a manufacturer-compatible scanner (e.g., Tech2 for GM, DRB-III for Jeep) to access specific transfer case parameters.

🚗 Need help? Share your vehicle’s make, model, and year for personalized advice! 🔧

What does it mean?

This is a generic powertrain diagnostic trouble code (DTC) that applies to many OBD-II vehicles (1996 and newer). This may include, but is not limited to, vehicles from Chrysler, Ford, Jeep, General Motors, Dodge, Chevrolet, Mercedes, etc. Although generic, the exact repair steps may vary depending on the year, make, model, and powertrain configuration.

The OBD-II fault code P0838 and related codes P0836, P0837, and P0839 are associated with the four-wheel drive (4WD) switch circuit. This circuit is also known as the transfer case control circuit.

The purpose of the four-wheel drive switch circuit is to allow the driver to select the activation of the four-wheel drive system and change the transfer case gear ratios between two-wheel high, two-wheel low, neutral, four-wheel high, and four-wheel low as needed based on the configuration.

When the PCM or TCM detects a voltage or resistance that is too low in the 4WD switch circuit, below the normal range threshold, the P0838 code will be set, and the check engine light, the 4WD malfunction light, or both may illuminate.

How severe is this DTC?

The severity of this code is normally moderate, but issues with the four-wheel drive switch circuit can be serious if the transfer case is stuck in low speed, causing unwanted strain on the internal transmission and engine components, requiring immediate attention. In some circumstances, the vehicle may not move or shift at all.

What are some of the symptoms of the code?

Symptoms of a P0838 fault code may include:

• Transfer case stuck in one gear
• Vehicle will not engage at all
• Transmission shifts harshly
• 4×4 malfunction light illuminated
• Check engine light illuminated

What are some common causes of the code?

Causes of this P0838 code may include:

• Faulty four-wheel drive switch
• Transfer case malfunction
• Faulty or damaged wiring
• Loose or faulty control module ground strap
• Corroded, damaged, or loose connector
• Faulty fuse or fuse link (if applicable)
• Faulty PCM or TCM

What are the troubleshooting steps for P0838?

The first step in the troubleshooting process for any malfunction is to search for technical service bulletins (TSBs) for the specific vehicle by year, model, and powertrain. In some circumstances, this can save a lot of time in the long run by pointing you in the right direction.

The second step is to check the transmission and transfer case fluid to verify its condition and confirm it is at the appropriate level. Then locate all components associated with the 4WD switch circuit and look for obvious physical damage. Based on the specific vehicle, this circuit may integrate several components, including the transfer case, switches, solenoids, PCM, and TCM. Perform a thorough visual inspection to ensure the associated wiring has no obvious defects such as scraping, rubbing, bare wires, or burn marks. Next, check the connectors and connections for security, corrosion, and damaged pins. This process must include all wiring connectors and connections to all components, including the PCM and TCM. Consult vehicle-specific technical data to verify the configuration and see if a fuse or fuse link is incorporated into the circuit.
Advanced Steps

Advanced steps become very vehicle-specific and require appropriate advanced equipment to operate accurately. These procedures require a digital multimeter and vehicle-specific technical references.
Voltage Checks

Reference voltage and acceptable ranges may vary depending on the specific vehicle and circuit configuration. Specific technical data will include troubleshooting charts and the appropriate sequence to follow to help you make an accurate diagnosis.

If this process identifies the absence of a power source or ground, continuity tests may be required to verify the integrity of the wiring, connectors, and other components. Continuity tests should always be performed with the power disconnected from the circuit, and normal readings for wiring and connections should be 0 ohms of resistance. Resistance or lack of continuity indicates faulty wiring that is open or shorted and must be repaired or replaced. A continuity test from the PCM or TCM to the chassis will confirm the service level of the ground straps and wires. The presence of resistance indicates a loose connection or possible corrosion.

What are the common repairs for this code?

• Replacing the 4×4 switch or solenoid
• Cleaning corrosion from connectors
• Repairing or replacing faulty wiring
• Replacing a blown fuse or fuse link (if applicable)
• Repairing or replacing faulty ground straps
• Flashing or replacing the PCM or TCMCommon Mistake

  Replacing the four-wheel drive switch or transfer case when faulty wiring causes the PCM or TCM to set this code.

  I hope the information in this article has been helpful in guiding you in the right direction to fix the issue with your 4WD switch circuit error code. This article is strictly informational, and your vehicle’s specific technical data and service bulletins should always take priority.

What does it mean?

This is a generic powertrain diagnostic trouble code (DTC) that applies to many OBD-II vehicles (1996-newer). This may include, but is not limited to, vehicles from Chrysler, Ford, Jeep, General Motors, Dodge, Chevrolet, Mercedes, etc. Although generic, the exact repair steps may vary depending on the year, make, model, and powertrain configuration.

The OBD-II fault code P0839 and related codes P0836, P0837, and P0838 are associated with the four-wheel drive (4WD) switch circuit. This circuit is also known as the transfer case control circuit.

The purpose of the four-wheel drive switch circuit is to allow the driver to select the activation of the four-wheel drive system and change the transfer case gear ratios between two-wheel high, two-wheel low, neutral, four-wheel high, and four-wheel low as needed based on the configuration.

When the PCM or TCM detects a voltage or resistance that is too high above the expected normal range in the 4WD switch circuit, code P0839 is set, and the check engine light, 4WD malfunction light, or both may illuminate.

How severe is this DTC?

The severity of this code is normally moderate, but four-wheel drive switch circuit issues can be serious if the transfer case is stuck in low gear, causing unwanted strain on the internal transmission and engine components requiring immediate attention. In some circumstances, the vehicle may not move or shift gears at all.

What are some of the symptoms of the code?

Symptoms of a P0839 fault code may include:

• Transfer case stuck in one gear
• The vehicle will not engage at all
• Transmission shifts harshly
• 4×4 malfunction light illuminated
• Check engine light illuminated

What are some of the common causes of the code?

Causes of this P0839 code may include:

• Faulty four-wheel drive switch
• Malfunctioning transfer case
• Defective or damaged wiring
• Loose or faulty control module ground strap
• Corroded, damaged, or loose connector
• Faulty fuse or fusible link (if applicable)
• Faulty PCM or TCM

What are the troubleshooting steps for P0839?

The first step in the troubleshooting process for any malfunction is to search for Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and powertrain. In some circumstances, this can save a lot of time in the long run by pointing you in the right direction.

The second step is to check the transmission and transfer case fluid to verify its condition and confirm it is at the appropriate level. Then locate all components associated with the 4WD switch circuit and look for obvious physical damage. Based on the specific vehicle, this circuit may integrate several components, including the transfer case, switches, solenoids, PCM, and TCM. Perform a thorough visual inspection to ensure the associated wiring has no obvious defects such as scraping, rubbing, bare wires, or burn marks. Next, check the connectors and connections for security, corrosion, and damaged pins. This process must include all wiring connectors and connections to all components, including the PCM and TCM. Consult vehicle-specific technical data to verify the configuration and see if a fuse or fusible link is incorporated into the circuit.
Advanced Steps

Advanced steps become very vehicle-specific and require appropriate advanced equipment to operate accurately. These procedures require a digital multimeter and vehicle-specific technical references.
Voltage Checks

Reference voltage and acceptable ranges may vary depending on the specific vehicle and circuit configuration. Specific technical data will include troubleshooting charts and the proper sequence to follow to help you make an accurate diagnosis.

If this process identifies the absence of a power source or ground, continuity tests may be required to verify the integrity of the wiring, connectors, and other components. Continuity tests should always be performed with the power disconnected from the circuit, and normal readings for wiring and connections should be 0 ohms of resistance. Resistance or lack of continuity is an indication of faulty wiring that is open or shorted and must be repaired or replaced. A continuity test from the PCM or TCM to the chassis will confirm the serviceability of the ground straps and wires. The presence of resistance indicates a loose connection or possible corrosion.

What are the common repairs for this code?

Replacing the 4×4 switch or solenoid
Cleaning corrosion from connectors
Repairing or replacing faulty wiring
Replacing a blown fuse or fusible link (if applicable)
Repairing or replacing faulty ground straps
Reprogramming or replacing the PCM or TCM

Common Mistake

Replacing the four-wheel drive switch or transfer case when faulty wiring is causing the PCM or TCM to set this code.

I hope the information in this article has been helpful in guiding you in the right direction to correct the issue with your 4WD switch circuit error code. This article is strictly informational, and the technical data and service bulletins specific to your vehicle should always take priority.

What does it mean?

This generic powertrain/engine diagnostic code generally applies to all OBD-II equipped vehicles, including but not limited to Nissan, Dodge, Chrysler, Honda, Chevrolet, GMC, Toyota, etc., but seems to be most commonly seen on Nissan vehicles.

The Transmission Fluid Pressure Sensor/Switch (TFPS) is typically found attached to the side of the valve body inside the transmission, although sometimes it may be found screwed into the side of the transmission case/body itself.

The TFPS converts mechanical transmission pressures into an electrical signal for the Powertrain Control Module (PCM) or Transmission Control Module (TCM). Typically, the PCM/TCM will then inform other controllers using the vehicle’s data communication bus.

The PCM/TCM receives this voltage signal to determine transmission operating pressure or when a shift occurs. This code is set if this “G” input does not match the normal operating voltages stored in the PCM/TCM memory. This may also be due to internal mechanical problems inside the transmission. Refer to a vehicle-specific repair manual to determine what the “G” circuit is for your particular vehicle.

P083A is typically an electrical circuit problem (TFPS sensor circuit), although, as mentioned earlier, this code may also be set due to mechanical issues (internal leaks, cracked or missing control balls in the valve body, low system operating pressure/main line pressure, stuck valve in the valve body). This cannot be ignored in the troubleshooting phase, especially when dealing with an intermittent issue.

Troubleshooting steps may vary depending on the manufacturer, TFPS sensor type, and wire colors.

Related “G” Transmission Fluid Pressure Sensor Circuit Codes:

P083B Transmission Fluid Pressure Sensor/Switch “G” Circuit Range/Performance
P083C Transmission Fluid Pressure Sensor/Switch “G” Circuit Low
P083D Transmission Fluid Pressure Sensor/Switch “G” Circuit High
P083E Transmission Fluid Pressure Sensor/Switch “G” Circuit Intermittent

Code Severity and Symptoms

Severity depends on the circuit where the failure occurred. Since it is an electrical failure, the PCM/TCM may compensate to some extent. The failure may mean the PCM/TCM alters transmission shifting if it is electronically controlled.

Symptoms of a P083A engine code may include:

Malfunction Indicator Light illuminated
Change in shift quality
Vehicle starts in 2nd or 3rd gear (limp mode)

Causes

Typically, the causes for this code to be set are as follows:

Open in the signal circuit to the TFPS sensor – possible
Short to voltage in the signal circuit to the TFPS sensor – possible
Short to ground in the signal circuit to the TFPS sensor – possible
Faulty TFPS sensor – probable
Internal mechanical transmission problem – possible
Failed PCM – unlikely (programming required after replacement)

Diagnostic and Repair Procedures

A good starting point is always to check the Technical Service Bulletins (TSBs) for your particular vehicle. Your problem may be a known issue with a known fix published by the manufacturer and can save you time and money when diagnosing.

A good example of this would be if there are known power-related codes set with P083A, or if there is more than one set of pressure sensor/switch codes. If so, begin your diagnosis with the power-related trouble code or multiple code diagnosis first, as this may be the reason for P083A.

Next, locate the Transmission Fluid Pressure Sensor/Switch (TFPS) on your particular vehicle. The TFPS is typically found attached to the side of the valve body inside the transmission, although it is sometimes screwed into the side of the transmission case/body itself. Once located, visually inspect the connector and wiring. Look for chafing, rubbing, bare wires, burn marks, or melted plastic. Separate the connector and carefully inspect the terminals (the metal parts) inside the connector. See if they look burned or have a green tint indicating corrosion, especially if they are mounted outside the transmission case. Use electrical contact cleaner and a plastic bristle brush if cleaning the terminals is necessary. Allow to dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic codes from memory and see if the P083A code returns. If not, the connections were likely your problem.

This is the most common area of concern for this code, as external transmission connections have the highest incidence of corrosion problems.

If the P083A code returns, we will need to test the TFPS sensor and its associated circuits. With the key off, disconnect the electrical connector from the TFPS sensor. Connect a black wire from the digital voltmeter (DVOM) to the ground or low reference terminal at the TFPS sensor harness connector. Connect the red wire from the digital voltmeter to the signal terminal of the TFPS sensor harness connector. Turn the key to the engine off position. Check manufacturer specifications; the voltmeter should read 12 volts or 5 volts. Wiggle the connections to see if they change. If the voltage is incorrect, repair the power or ground wire or replace the PCM/TCM.

If the previous test was successful, connect one wire of an ohmmeter to the signal terminal of the TFPS sensor and the other wire to the ground or low reference terminal of the sensor. Check manufacturer specifications for sensor resistance to accurately test resistance to pressure when no pressure is applied to it. Wiggle the transmission fluid pressure sensor/switch connector while monitoring the resistance. If the ohmmeter readings do not pass, replace the TFPS.

If all previous tests have passed and you continue to get a P083A, this would most likely indicate a faulty TFPS sensor, although a faulty PCM/TCM cannot be ruled out, nor internal transmission malfunctions until the TFPS sensor has been replaced. When in doubt, seek help from a qualified automotive diagnostician. PCMs/TCMs must be programmed or calibrated to the vehicle in order to be installed correctly.

What does it mean?

This generic powertrain/engine diagnostic code generally applies to all vehicles equipped with OBD-II, including but not limited to Jeep, Dodge, Mazda, Nissan, Honda, GM, etc.

The Transmission Fluid Pressure Sensor/Switch (TFPS) is typically found attached to the side of the valve body inside the transmission, although sometimes it may be found screwed into the side of the transmission case/body itself.

The TFPS converts mechanical transmission pressures into an electrical signal for the Powertrain Control Module (PCM) or Transmission Control Module (TCM). Typically, the PCM/TCM will then inform other controllers using the vehicle’s data communication bus.

The PCM/TCM receives this voltage signal to determine the transmission operating pressure or when a change occurs. This code is set if this “G” input does not match the normal operating voltages stored in the PCM/TCM memory. This may also be due to internal mechanical problems inside the transmission. Refer to a vehicle-specific repair manual to determine what the “G” circuit is for your particular vehicle.

P083B is generally an electrical circuit problem (TFPS sensor circuit), although, as mentioned earlier, this code can also be set due to mechanical issues (internal leaks, cracked or missing control balls in the valve body, low system operating pressure/main line pressure, stuck valve in the valve body). This cannot be ignored during the troubleshooting phase, especially when dealing with an intermittent issue.

Troubleshooting steps may vary by manufacturer, TFPS sensor type, and wire colors.

Related “G” Transmission Fluid Pressure Sensor circuit codes:

• P083A Transmission Fluid Pressure Sensor/Switch, “G” circuit
• P083C Transmission Fluid Pressure “G” Sensor/Switch Low
• P083D Transmission Fluid Pressure “G” Sensor/Switch High
• P083E Transmission Fluid Pressure “G” Sensor/Switch, intermittent circuit

Code Severity and Symptoms

The severity depends on the circuit where the failure occurred. Since it is an electrical failure, the PCM/TCM can compensate to some extent. The failure may mean that the PCM/TCM alters the transmission shift if it is electronically controlled.

Symptoms of a P083B engine code may include:

• Malfunction Indicator Lamp illuminated
• Change in shift quality
• Vehicle starts in 2nd or 3rd gear (limp mode)

Causes

Typically, the causes for this code to set are as follows:

• Open in the signal circuit to the TFPS sensor – possible
• Short to voltage in the signal circuit to the TFPS sensor – possible
• Short to ground in the signal circuit to the TFPS sensor – possible
• Failed TFPS sensor – probable
• Internal mechanical transmission problem – possible
• Failed PCM – unlikely (programming required after replacement)

Diagnostic and Repair Procedures

A good starting point is always to check the Technical Service Bulletins (TSBs) for your particular vehicle. Your issue may be a known problem with a known fix published by the manufacturer and can save you time and money during diagnosis.

A good example of this would be if there are known power-related codes with P083B, or if there is more than one set of pressure sensor/switch codes. If so, start your diagnosis with the power-related trouble code or the multiple code diagnosis first, as this may be the reason for P083B.

Next, locate the Transmission Fluid Pressure Sensor/Switch (TFPS) on your particular vehicle. The TFPS is typically found attached to the side of the valve body inside the transmission, although it is sometimes screwed into the side of the transmission case/body itself. Once located, visually inspect the connector and wiring. Look for chafing, rubbing, bare wires, burns, or melted plastic. Disconnect the connector and carefully inspect the terminals (the metal parts) inside the connector. See if they look burned or have a greenish tint indicating corrosion, especially if they are mounted outside the transmission case. Use electrical contact cleaner and a plastic bristle brush if cleaning the terminals is necessary. Let it dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic codes from memory and see if the P083B code returns. If not, the connections were likely your problem.

This is the most common area of concern for this code, as external transmission connections have the highest number of corrosion issues.

If the P083B code returns, we will need to test the TFPS sensor and its associated circuits. With the key off, disconnect the electrical connector from the TFPS sensor. Connect a black wire from the Digital Voltmeter (DVOM) to the ground or low reference terminal at the TFPS sensor wiring harness connector. Connect the red wire from the Digital Voltmeter to the signal terminal at the TFPS sensor wiring harness connector. Turn the key to the engine off position. Check the manufacturer’s specifications

What does it mean?

This generic powertrain/engine diagnostic code generally applies to all OBD-II equipped vehicles, including but not limited to Chevrolet, Acura, Honda, Saturn, Jeep, Toyota, etc.

The Transmission Fluid Pressure Sensor/Switch (TFPS) is typically found attached to the side of the valve body inside the transmission, although it may sometimes be found screwed into the side of the transmission case/body itself.

The TFPS converts mechanical transmission pressures into an electrical signal for the Powertrain Control Module (PCM) or Transmission Control Module (TCM). Typically, the PCM/TCM will then inform other controllers using the vehicle’s data communication bus.

The PCM/TCM receives this voltage signal to determine the transmission’s operating pressure or when a change occurs. This code is set if this “G” input does not match the normal operating voltages stored in the PCM/TCM memory. This could also be due to internal mechanical issues within the transmission. Refer to a vehicle-specific repair manual to determine what the “G” circuit is for your particular vehicle.

P083C is generally an electrical circuit issue (TFPS sensor circuit). This cannot be ignored during the troubleshooting phase, especially when it is an intermittent problem.

Troubleshooting steps may vary by manufacturer, TFPS sensor type, and wire colors.

Related “G” Transmission Fluid Pressure Sensor Circuit Codes:

P083A Transmission Fluid Pressure Sensor/Switch “G” Circuit
P083B Transmission Fluid Pressure Sensor/Switch “G” Circuit Range/Performance
P083D Transmission Fluid Pressure Sensor/Switch “G” High
P083E Transmission Fluid Pressure Sensor/Switch “G” Circuit Intermittent

Code Severity and Symptoms

The severity depends on the circuit where the failure occurred. Since it is an electrical failure, the PCM/TCM can compensate to some extent. The failure may mean the PCM/TCM alters the transmission shift if it is electronically controlled.

Symptoms of a P083C engine code may include:

Malfunction Indicator Light on
Change in shift quality
Vehicle starts in 2nd or 3rd gear (limp mode)

Causes

Typically, the causes for this code to set are as follows:

Short to ground in the signal circuit to the TFPS sensor – possible
Failed/internally shorted TFPS sensor – likely
Failed PCM – unlikely (programming required after replacement)

Diagnostic and Repair Procedures

A good starting point is always to check the Technical Service Bulletins (TSBs) for your specific vehicle. Your issue may be a known problem with a known fix published by the manufacturer and can save you time and money during diagnosis.

Next, locate the Transmission Fluid Pressure Sensor/Switch (TFPS) on your specific vehicle. The TFPS is typically found attached to the side of the valve body inside the transmission, although it is sometimes screwed into the side of the transmission case/body itself. Once located, visually inspect the connector and wiring. Look for chafing, rubbing, bare wires, burns, or melted plastic. Separate the connector and carefully inspect the terminals (the metal parts) inside the connector. See if they look burned or have a greenish tint indicating corrosion, especially if they are attached outside the transmission case. Use electrical contact cleaner and a plastic bristle brush if cleaning the terminals is necessary. Let it dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic codes from the memory and see if the P083C code returns. If not, the connections were likely your problem.

This is the most common area of concern for this code, as external transmission connections have the highest incidence of corrosion issues.

If the P083C code returns, we will need to test the TFPS sensor and its associated circuits. With the key off, disconnect the electrical connector from the TFPS sensor. Connect a black wire from the Digital Volt Ohm Meter (DVOM) to the ground or low reference terminal at the TFPS sensor wiring harness connector. Connect the red wire from the DVOM to the signal terminal at the TFPS sensor wiring harness connector. Turn the key to the engine off position. Check the manufacturer’s specifications; the voltmeter should read 12 volts or 5 volts. Wiggle the connections to see if they change. If the voltage is incorrect, repair the power or ground wire or replace the PCM/TCM.

If the previous test was successful, connect one wire of an ohmmeter to the signal terminal of the TFPS sensor and the other wire to the ground or low reference terminal of the sensor. Check the manufacturer’s specifications for the sensor’s resistance to accurately test the resistance to pressure when no pressure is applied to it. Wiggle the Transmission Fluid Pressure Sensor/Switch connector while monitoring the resistance. If the ohmmeter readings do not pass, replace the TFPS.

If all previous tests were successful and you continue to get a P083C, this would most likely indicate a faulty TFPS sensor, although a faulty PCM/TCM cannot be ruled out, nor can internal transmission malfunctions until the TFPS sensor has been replaced. If in doubt, seek assistance from a qualified automotive diagnostician. PCMs/TCMs need to be programmed or calibrated according to the vehicle to be installed correctly.

What does it mean?

This generic powertrain/engine diagnostic code generally applies to all OBD-II equipped vehicles, including but not limited to Dodge, Chrysler, Chevrolet, GMC, Acura, Toyota, etc., but it seems to be most commonly seen on Honda vehicles.

The Transmission Fluid Pressure Sensor/Switch (TFPS) is typically found attached to the side of the valve body inside the transmission, although it may sometimes be found screwed into the side of the transmission housing/body itself.

The TFPS converts mechanical transmission pressures into an electrical signal for the Powertrain Control Module (PCM) or the Transmission Control Module (TCM). Typically, the PCM/TCM will then inform other controllers using the vehicle’s data communication bus.

The PCM/TCM receives this voltage signal to determine the transmission operating pressure or when a change occurs. This code is set if this “G” input does not match the normal operating voltages stored in the PCM/TCM memory. Refer to a vehicle-specific repair manual to determine what the “G” circuit is for your particular vehicle.

P083D is generally an electrical circuit issue (TFPS sensor circuit). This cannot be ignored in the troubleshooting phase, especially when it is an intermittent problem.

Troubleshooting steps may vary depending on the manufacturer, the type of TFPS sensor, and the wire colors.

Related “G” Transmission Fluid Pressure Sensor circuit codes:

• P083A Transmission Fluid Pressure Sensor/Switch, “G” Circuit
• P083B Transmission Fluid Pressure Sensor/Switch “G” Circuit Range/Performance
• P083C Transmission Fluid Pressure Sensor/Switch “G” Low
• P083E Transmission Fluid Pressure Sensor/Switch “G” Circuit Intermittent

Code Severity and Symptoms

The severity depends on the circuit where the failure occurred. Since it is an electrical failure, the PCM/TCM can compensate to some extent. The failure may mean that the PCM/TCM alters the transmission shift if it is electronically controlled.

Symptoms of a P083D engine code may include:

• Malfunction Indicator Lamp illuminated
• Change in shift quality
• Vehicle starts in 2nd or 3rd gear (limp mode)

Causes

Typically, the causes for this code to set are as follows:

• Short to power in the TFPS sensor signal circuit – possible
• Open circuit to ground of the TFPS sensor – possible
• Failed/shorted internally TFPS sensor – probable
• Failed PCM – unlikely (programming required after replacement)

Diagnostic and Repair Procedures

A good starting point is always to check the Technical Service Bulletins (TSBs) for your particular vehicle. Your problem may be a known issue with a known fix released by the manufacturer and can save you time and money when diagnosing.

A good example of this would be if there are known power-related codes with P083D, or if there is more than one set of pressure sensor/switch codes. If so, start your diagnosis with the power-related trouble code or the multiple code diagnosis first, as this may be the reason for P083D.

Next, locate the Transmission Fluid Pressure Sensor/Switch (TFPS) on your particular vehicle. The TFPS is typically found attached to the side of the valve body inside the transmission, although it is sometimes screwed into the side of the transmission housing/body itself. Once located, visually inspect the connector and wiring. Look for chafing, rubbing, bare wires, burns, or melted plastic. Separate the connector and carefully inspect the terminals (the metal parts) inside the connector. See if they look burned or have a greenish tint indicating corrosion, especially if they are attached outside the transmission case. Use electrical contact cleaner and a plastic bristle brush if cleaning the terminals is necessary. Let it dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic codes from memory and see if the P083D code returns. If it does not, the connections were likely your problem.

This is the most common area of concern for this code, as external transmission connections have the highest number of corrosion issues.

If the P083D code returns, we will need to test the TFPS sensor and its associated circuits. With the key off, disconnect the electrical connector from the TFPS sensor. Connect a black wire from the Digital Volt Ohm Meter (DVOM) to the ground or low reference terminal at the TFPS sensor wiring harness connector. Connect the red wire from the DVOM to the signal terminal at the TFPS sensor wiring harness connector. Turn the key to the engine off position. Check the manufacturer’s specifications; the voltmeter should read 12 volts or 5 volts. Wiggle the connections to see if they change. If the voltage is incorrect, repair the power or ground wire or replace the PCM/TCM.

If the previous test was successful, connect one wire of an ohmmeter to the signal terminal of the TFPS sensor and the other wire to the ground or low reference terminal at the sensor. Check the manufacturer’s specifications for the sensor resistance to accurately test the resistance to pressure when no pressure is applied to it. Wiggle the Transmission Fluid Pressure Sensor/Switch connector while monitoring the resistance. If the ohmmeter readings do not pass, replace the TFPS.

If all previous tests were successful and you continue to get a P083D, this would most likely indicate a faulty TFPS sensor, although a faulty PCM/TCM cannot be ruled out, nor can internal transmission malfunctions until the TFPS sensor has been replaced. If in doubt, seek assistance from a qualified automotive diagnostician. PCMs/TCMs need to be programmed or calibrated to the vehicle in order to be installed correctly.

What does it mean?

This generic powertrain/drivetrain diagnostic trouble code typically applies to all OBD-II equipped vehicles (e.g., GM, Chevrolet, Honda, Toyota, Ford, etc.), but appears more frequently in Nissan vehicles.

The Transmission Fluid Pressure Sensor/Switch (TFPS) is typically found attached to the side of the valve body inside the transmission, although it may sometimes be found screwed into the side of the transmission case/body itself.

The TFPS converts mechanical transmission pressures into an electrical signal for the Powertrain Control Module (PCM) or the Transmission Control Module (TCM). Typically, the PCM/TCM will then inform other controllers using the vehicle’s data communication bus.

The PCM/TCM receives this voltage signal to determine the transmission operating pressure or when a shift occurs. This code is set if this “G” input does not match the normal operating voltages stored in the PCM/TCM’s memory. This can also be due to internal mechanical problems inside the transmission. Refer to a vehicle-specific repair manual to determine what the “G” circuit is for your particular vehicle.

P083E is typically an electrical circuit issue (TFPS sensor circuit), although, as mentioned earlier, this code can also be set due to mechanical problems (internal leaks, cracked or missing check balls in the valve body, low system operating pressure/main line pressure, stuck valve in the valve body). This cannot be ignored in the troubleshooting phase, especially when dealing with an intermittent issue.

Troubleshooting steps may vary depending on the manufacturer, the type of TFPS sensor, and the wire colors.

Related “G” Transmission Fluid Pressure Sensor Circuit Codes:

• P083A Transmission Fluid Pressure Sensor/Switch “G” Circuit
• P083B Transmission Fluid Pressure Sensor/Switch “G” Circuit Range/Performance
• P083C Transmission Fluid Pressure Sensor/Switch “G” Circuit Low
• P083D Transmission Fluid Pressure Sensor/Switch “G” Circuit High

Code Severity and Symptoms

The severity depends on the circuit where the failure occurred. As it can be an electrical failure or a mechanical failure, the PCM/TCM may compensate to some extent. The failure could mean the PCM/TCM alters the transmission shift if it is electronically controlled.

Symptoms of a P083E engine code may include:

• Malfunction Indicator Lamp (MIL) illuminated
• Change in shift quality
• Vehicle starts in 2nd or 3rd gear (limp-in mode)

Causes

Typically, the causes for this code to set are:

• Intermittent open in the signal circuit to the TFPS sensor
• Intermittent short to voltage in the signal circuit to the TFPS sensor
• Intermittent short to ground in the signal circuit to the TFPS sensor
• Failed TFPS sensor – likely
• Internal transmission mechanical problem – possible
• Failed PCM – unlikely (programming required after replacement)

Diagnostic and Repair Procedures

A good starting point is always to check the Technical Service Bulletins (TSBs) for your particular vehicle. Your issue may be a known problem with a known fix issued by the manufacturer and can save you time and money when diagnosing.

A good example of this would be if there are known power-related codes with P083E, or if there is more than one set of pressure sensor/switch codes. If so, start your diagnosis with the power-related trouble code or the multiple code diagnosis first, as this might be the reason for P083E.

Next, locate the Transmission Fluid Pressure Sensor/Switch (TFPS) on your specific vehicle. The TFPS is typically found attached to the side of the valve body inside the transmission, although it is sometimes screwed into the side of the transmission case/body itself. Once located, visually inspect the connector and wiring. Look for chafing, rubbing, bare wires, burn spots, or melted plastic. Disconnect the connector and carefully inspect the terminals (the metal parts) inside the connector. See if they look burned or have a greenish tint indicating corrosion, especially if they are mounted externally on the transmission case. Use electrical contact cleaner and a plastic bristle brush if cleaning the terminals is necessary. Allow it to dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic trouble codes from memory and see if the P083E code returns. If it does not, the connections were likely your problem.

This is the most common area of concern for this code, as external transmission connections have the highest incidence of corrosion issues.

If the P083E code returns, we will need to test the TFPS sensor and its associated circuits. With the key off, disconnect the electrical connector from the TFPS sensor. Connect a black wire from the Digital Volt Ohm Meter (DVOM) to the ground or low reference terminal at the TFPS sensor harness connector. Connect the red wire from the DVOM to the signal terminal at the TFPS sensor harness connector.