P0877 Low Transmission Fluid Pressure Circuit D Sensor / Switch

What does it mean?

This generic powertrain/engine diagnostic code generally applies to all OBD-II equipped engines, but appears more frequently in certain Dodge/Chrysler/Jeep, General Motors, and Toyota 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 housing/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 input does not match the normal operating voltages stored in the PCM/TCM memory. This can also be due to internal mechanical problems inside the transmission.

P0877 is typically 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 by manufacturer, TFPS sensor type, and wire colors.

Related Transmission Fluid Pressure Sensor D codes:

P0875 Transmission Fluid Pressure Sensor/Switch, “D” Circuit
P0876 Transmission Fluid Pressure Sensor/Switch “D” Circuit Range/Performance
P0878 Transmission Fluid Pressure Sensor/Switch “D” High
P0879 Transmission Fluid Pressure Sensor/Switch “D” 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 P0877 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 set are:

Short to ground in the signal circuit to 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 specific vehicle. Your issue may be a known problem with a known fix published by the manufacturer and can save you time and money when diagnosing.

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 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 P0877 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 most corrosion issues.

If the P0877 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 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 were successful and you continue to get a P0877, this would most likely indicate a faulty TFPS sensor, although a failed PCM/TCM could not be ruled out, nor internal transmission malfunctions before replacing the TFPS sensor. If in doubt, seek assistance from a qualified automotive diagnostician. PCMs/TCMs need to be programmed or calibrated to the vehicle to be installed properly.

P0878 High Transmission Fluid Pressure Sensor/Switch D Circuit

What Does It Mean?

This generic powertrain/drivetrain diagnostic trouble code generally applies to all OBD-II-equipped engines but appears more frequently in certain Dodge/Chrysler/Jeep, General Motors, and Toyota vehicles.

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 input does not match the normal operating voltages stored in the PCM/TCM’s memory.

P0878 is typically 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 depending on the manufacturer, the type of TFPS sensor, and the wire colors.

Related Transmission Fluid Pressure Sensor D Codes:

P0875 Transmission Fluid Pressure Sensor/Switch, “D” Circuit
P0876 Transmission Fluid Pressure Sensor/Switch “D” Circuit Range/Performance
P0877 Transmission Fluid Pressure Sensor/Switch “D” Low
P0879 Transmission Fluid Pressure Sensor/Switch, “D” 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 may compensate to some extent. The failure could mean that the PCM/TCM alters the transmission shift if it is electronically controlled.

Symptoms of a P0878 engine code may include:

Malfunction Indicator Lamp (MIL) 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/internally shorted 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 specific vehicle. Your issue might be a known problem with a known fix published by the manufacturer and could save you time and money during diagnosis.

A good example of this would be if there are known codes related to power supply with P0878, 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 diagnostic first, as this might be the reason for P0878.

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 scratches, rubbing, exposed wires, burns, or melted plastic. Disconnect the connector and carefully inspect the terminals (the metal parts) inside the connector. Check if they appear burnt or have a greenish tint indicating corrosion, especially if they are mounted outside the transmission case. Use an electrical contact cleaner and a plastic-bristled 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 P0878 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 P0878 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 TFPS sensor’s signal terminal 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. 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 P0878, 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 to be installed correctly.

P0879 Transmission Fluid Pressure Sensor/Switch D, Intermittent Circuit

What Does It Mean?

This generic powertrain/engine diagnostic code generally applies to all OBD-II equipped engines, but appears more frequently in certain Dodge/Chrysler/Jeep, General Motors, and Toyota vehicles.

P0879 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 during 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 Transmission Fluid Pressure Sensor D Codes:

P0875 Transmission Fluid Pressure Sensor/Switch “D” Circuit
P0876 Transmission Fluid Pressure Sensor/Switch “D” Circuit Performance
P0877 Transmission Fluid Pressure Sensor/Switch “D” Low
P0878 Transmission Fluid Pressure Sensor/Switch “D” High

Code Severity and Symptoms

Severity depends on the circuit where the failure occurred. Since it can be an electrical failure or a mechanical 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 P0879 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:

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 mechanical transmission problem – possible
Failed PCM – unlikely (programming required after replacement)

Diagnostic and Repair Procedures

A good example of this would be if there are known power-related codes with P0879, 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 multiple code diagnosis first, as this may be the reason for P0879.

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 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. 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 P0879 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 P0879 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 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 were successful and you continue to get a P0879, 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 must be programmed or calibrated to the vehicle to be installed correctly.

P087A, P087B, P087C, P087D, P087E, P087F ISO/SAE Reserved

P0395 – P03FF ISO/SAE reserved

P0880 TCM Power Input Signal

What does P0880 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). This may include, but is not limited to, vehicles from Hyundai, Allison, Range Rover, BMW, Chevy, Kia, Dodge, Jeep, etc. Although generic, the exact repair steps may vary by year, make, model, and powertrain configuration.

If your vehicle has stored a P0880 code, accompanied by a malfunction indicator lamp (MIL) and/or a TCM (transmission control module) light, it means that the powertrain control module (PCM) has detected a problem in the TCM power input circuit.

While some transmission control modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P codes, B codes, or even U codes, depending on the vehicle’s make and model. If a P0880 code is stored, it is likely that other PCM and/or TCM codes are also stored. Anti-lock braking system (ABS) codes may also be recorded.

The electronic transmission control systems of OBD-II equipped vehicles are managed using a network of computers (called control modules). This involves constant communication between the various control modules via the controller area network (CAN).

The CAN is a complex system of wiring and connectors used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is not only used for comparison in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems.

The PCM uses input signals from multiple engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows clutches to momentarily disengage from the sprag so that the gear ratio can be smoothly changed. One or more electronic pressure control (EPC) solenoids help regulate fluid pressure. Electronic pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so that the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

As with many other automatic transmission malfunctions, a transmission control system code can be caused by an electrical or mechanical failure. If the PCM detects a malfunction, the MIL should illuminate and a P0880 code will be stored.

How severe is this DTC?

If this code is stored, you may have noticed that your transmission is shifting much harder than normal. If your vehicle has displayed a P0880 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0880 trouble code may include:

Electronic traction control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other related codes
ABS disabled

What are some common causes of the code?

Causes of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle speed sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Defective TCM, PCM, or programming error

What are the troubleshooting steps for P0880?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0880 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

You can save time by looking for technical service bulletins (TSBs) that match the stored code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick fix for your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code turns out to be intermittent). After that, clear the codes and test drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0880 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and the vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system fuses. Replace any blown or faulty fuses as needed and retest.

If voltage and ground are detected at the TCM, test the corresponding circuit at the PCM connector. If no voltage is detected there, suspect an open circuit between the component in question and the PCM. If voltage is found there, suspect a faulty TCM, PCM, or a programming error.

P0880 is typically stored due to a faulty ignition relay

P0881 TCM Power Input Signal Range/Performance

What does P0881 mean?

If your vehicle has stored a P0881 code, accompanied by a malfunction indicator lamp (MIL) and/or a TCM (transmission control module) indicator, it means that the powertrain control module (PCM) has detected an out-of-range voltage or performance issue in the TCM power supply input circuit.

While some transmission control modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P codes, B codes, or even U codes, depending on the vehicle’s make and model. If a P0881 code is stored, it is likely that other PCM and/or TCM codes are also stored. Anti-lock braking system (ABS) codes may also be recorded.

The electronic transmission control systems of OBD-II equipped vehicles are managed using a network of computers (called control modules). This involves constant communication between different control modules via the controller area network (CAN).

The CAN is a complex system of wiring and connectors used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is used not only for comparison in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems.

How severe is this DTC?

If this code is stored, you may have noticed that your transmission is shifting much harder than normal. If your vehicle has presented a P0881 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0881 trouble code may include:

Electronic traction control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other related codes
ABS disabled

What are some common causes of the code?

Causes of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle speed sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Faulty TCM, PCM, or programming error

What are the troubleshooting steps for P0881?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0881 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

You can save time by searching for technical service bulletins (TSBs) that match the stored code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick solution to your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code proves to be intermittent). After that, clear the codes and test-drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0881 to store may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system fuses. Replace blown or faulty fuses as needed and retest.

P0881 is typically stored due to a faulty contact relay

P0882 TCM Low Power Supply Input Signal

What does P0882 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996 and newer). This may include, but is not limited to, vehicles from Hyundai, Allison, Range Rover, BMW, Chevy, Kia, Dodge, Jeep, etc. Although generic, the exact repair steps may vary by year, make, model, and powertrain configuration.
If your vehicle has stored a P0882 code, accompanied by a malfunction indicator lamp (MIL) and/or a TCM (transmission control module) light, it means that the powertrain control module (PCM) has detected a low voltage condition in the TCM power supply input circuit.

While some transmission control modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P codes, B codes, or even U codes, depending on the vehicle’s make and model. If a P0882 code is stored, it is likely that other PCM and/or TCM codes are also stored. Anti-lock braking system (ABS) codes may also be recorded.

The CAN is a complex system of wiring and connectors used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is used not only for comparison in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems.

The PCM uses input signals from multiple engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows the clutches to momentarily disengage from the sprag so that the gear ratio can be smoothly changed. One or more electronic pressure control (EPC) solenoids help regulate fluid pressure. Electronic pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so that the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

How severe is this DTC?

If this code is stored, you may have noticed that your transmission is shifting much harder than normal. If your vehicle has displayed a P0882 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0882 trouble code may include:

Electronic traction control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other related codes
ABS disabled

What are some common causes of the code?

Causes of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle speed sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Defective TCM, PCM, or programming error

What are the troubleshooting steps for P0882?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0882 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code turns out to be intermittent). After that, clear the codes and test-drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0882 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system fuses. Replace any blown or faulty fuses as needed and retest.

P0882 is typically stored due to a faulty contact relay

P0883 TCM High Power Input Signal

What does P0883 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). This may include, but is not limited to, vehicles from Hyundai, Allison, Range Rover, BMW, Chevy, Kia, Dodge, Jeep, etc. Although generic, the exact repair steps may vary depending on the year, make, model, and powertrain configuration.

If your vehicle has stored a P0883 code, accompanied by a malfunction indicator lamp (MIL) and/or a TCM (transmission control module) light, it means that the powertrain control module (PCM) has detected a high voltage condition in the TCM power supply input circuit.

While some transmission control modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P codes, B codes, or even U codes, depending on the vehicle’s make and model. If a P0883 code is stored, it is likely that other PCM and/or TCM codes are also stored. Anti-lock braking system (ABS) codes may also be recorded.

The PCM uses input signals from multiple engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows the clutches to momentarily disengage from the sprag so that the gear ratio can be smoothly changed. One or more electronic pressure control (EPC) solenoids help regulate fluid pressure. Electronic pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so that the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

How severe is this DTC?

If this code is stored, you may have noticed that your transmission is shifting much harder than normal. If your vehicle has displayed a P0883 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0883 fault code may include:

Electronic traction control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other related codes
ABS disabled

What are some common causes of the code?

Causes of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle speed sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Faulty TCM, PCM, or programming error

What are the troubleshooting steps for P0883?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0883 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0883 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system fuses. Replace any blown or faulty fuses as needed and retest.

P0883 is typically stored due to a faulty contact relay

P0884 TCM Intermittent Power Input Signal

What does P0884 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). This may include, but is not limited to, vehicles from Hyundai, Allison, Range Rover, BMW, Chevy, Kia, Dodge, Jeep, etc. Although generic, the exact repair steps may vary depending on the year, make, model, and powertrain configuration.

If your vehicle has stored a P0884 code, accompanied by a Malfunction Indicator Lamp (MIL) and/or a Transmission Control Module (TCM) light, it means the Powertrain Control Module (PCM) has detected an intermittent voltage condition in the TCM power supply input circuit.

While some Transmission Control Modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P-codes, B-codes, or even U-codes, depending on the vehicle’s make and model. If a P0884 code is stored, it is highly likely that other PCM and/or TCM codes are also stored. Anti-lock Brake System (ABS) codes may also be recorded.

The CAN is a complex system of wiring and connectors used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is used not only for comparison purposes in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems.

The PCM uses input signals from various engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows the clutches to momentarily separate from the sprag so the gear ratio can be smoothly changed. One or more Electronic Pressure Control (EPC) solenoids help regulate fluid pressure. Electronic Pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

How severe is this DTC?

If this code is stored, you may have noticed your transmission shifting much harder than normal. If your vehicle has set a P0884 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0884 fault code may include:

Electronic Traction Control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other related codes
ABS disabled

What are some common causes of the code?

The Causes

of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle Speed Sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Defective TCM, PCM, or programming error

What are the P0884 troubleshooting steps?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0884 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

You can save time by searching for Technical Service Bulletins (TSBs) that match the stored code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the correct TSB, it might provide a quick fix for your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code proves to be intermittent). After that, clear the codes and test drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0884 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location charts, wiring diagrams, and diagnostic flowcharts (related to the code and the specific vehicle) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system fuses. Replace any blown or faulty fuses as needed and retest.

P0884 is typically stored due to a faulty ignition relay

P0885 TCM Power Relay Control Circuit / Open

Code P0885: Definition, Symptoms, Causes and Diagnosis

📌 Quick Overview

Definition: Electrical problem in the TCM (Transmission Control Module) power relay circuit.
Severity: Medium to High (risk of transmission damage).
Symptoms: Harsh gear shifts, ABS/traction control system deactivated, associated codes.
Common Causes: Blown fuse, faulty relay, damaged wiring, TCM/PCM failure.

1. Meaning of Code P0885

Code P0885 indicates that the PCM (Powertrain Control Module) has detected an electrical anomaly in the TCM power relay circuit. This relay controls the electrical power supply to the TCM, which is essential for managing the automatic transmission.

Key Operation:

The TCM communicates with the PCM via the CAN (Controller Area Network) bus.
Shared data includes: engine RPM, vehicle speed, hydraulic pressure.
A failure in this circuit disrupts the shift strategy and related systems (ABS, stability control).

2. Severity and Risks

Immediate Problems:
Harsh or impossible gear changes.
Deactivation of safety systems (ABS, traction control).
Long-Term Risks:
Premature wear of clutches and hydraulic components.
Transmission overheating.

3. Common Symptoms

🚨 Check Engine Light illuminated (MIL).
🔧 Erratic or delayed gear changes.
🛑 Automatic deactivation of traction control/ABS.
⚡ Other stored codes (e.g., P0865, U codes related to CAN).

4. Possible Causes

Category	Detailed Causes
Electrical	– Blown fuse or faulty TCM relay.
	– Damaged wiring (short circuits, chafed wires).
	– Oxidized or poorly secured connectors.
Electronic	– TCM or PCM failure.
	– Module programming error.
Mechanical	– Hydraulic pressure problem in the transmission.
CAN System	– Disturbances or failures in the communication network.

5. Diagnostic Steps

Required Tools:

OBD-II scanner (reading codes and live data).
Digital multimeter (testing voltage/resistance).
Oscilloscope (analyzing speed sensor signals).

Procedure:

Code Reading:

Identify all stored codes (P, B, U).
Consult Technical Service Bulletins (TSBs) for known solutions.

Visual Inspection:

Check fuses, relays, and wiring related to the TCM.
Look for signs of burning, corrosion, or cut wires.

Electrical Tests:

Measure the TCM power supply voltage (should be ~12V).
Test the continuity of the CAN circuits between TCM and PCM.

Component Verification:

Replace the TCM relay with a known good relay for testing.
Use the oscilloscope to analyze speed sensor signals.

Advanced Diagnostics:

If the TCM/PCM is suspected, perform a test with a replacement module.
Update module software if programming errors are detected.

6. Common Solutions

🔌 Replace a faulty fuse/relay: Average cost €10–50.
🔧 Repair damaged wiring: Solder or replace problematic wires.
💻 Reset/Update the TCM/PCM: Requires a professional diagnostic tool.
⚠️ Replace the TCM: High cost (€300–1000 depending on model).

7. Practical Tips

Do not ignore intermittent codes: An intermittent P0885 can signal an emerging problem.
Check the transmission fluid level and condition: Low hydraulic pressure can worsen symptoms.
Consult a professional: CAN and TCM systems require expertise for accurate diagnosis.

8. Frequently Affected Models

Hyundai/Kia: Tucson, Sportage (recurring relay issues).
Jeep/Dodge: Grand Cherokee, Ram 1500 (TCM failures).
Ford: Focus, F-150 (fragile wiring near the transmission).

Conclusion

Code P0885 signals a critical electrical problem affecting transmission management. A methodical diagnosis (fuses, relays, wiring) is essential to avoid costly repairs. If technical skills are lacking, entrust the vehicle to a specialist in automotive electronic systems.

⚠️ Reminder: A malfunctioning transmission can endanger your safety. Act quickly!