How severe is this DTC?

The severity of this code can vary significantly from moderate to severe depending on the specific symptoms of the malfunction. A misfire requires immediate attention as it can cause permanent damage to internal engine components.

What are some symptoms of the code?

Symptoms of a P3443 trouble code may include:

• Engine may misfire
• Increased fuel consumption
• Poor engine performance
• Service engine soon light
• Check engine light illuminated

What are some common causes of the code?

Causes

of this P3443 code may include:

• Faulty cylinder deactivation solenoid
• Low engine oil level or pressure
• Restricted oil passage
• Faulty or damaged wiring
• Corroded, damaged, or loose connector
• Faulty ECM

What are the troubleshooting steps for P3443?

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

The second step is to check the engine oil condition and confirm it is maintained at the appropriate level. Then locate all components associated with the cylinder 6 deactivation intake valve control circuit and look for obvious physical damage. Based on the specific vehicle, this circuit may incorporate multiple components including the deactivation solenoid, switches, fault indicators, and ECM. Perform a thorough visual inspection to verify that associated wiring shows no obvious defects such as scraping, rubbing, bare wires, or burn marks. Next, check connectors and connections for security, corrosion, and damaged pins. This process should include all wiring connectors and connections to all components including the ECM. Consult vehicle-specific technical data to verify the configuration of the cylinder 6 deactivation/intake control circuit and confirm each component incorporated in the circuit which may include a fuse or fusible link.

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 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 establish 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 wiring, connectors, and other components. Continuity tests should always be performed with power disconnected from the circuit and normal readings for wiring and connections should be 0 ohms resistance. Resistance or lack of continuity is an indication of faulty wiring that is open, shorted, or corroded and should be repaired or replaced.

What are common repairs for this code?

• Replacing the deactivation solenoid
• Cleaning connector corrosion
• Repairing or replacing faulty wiring
• Changing oil and filter
• Cleaning blocked oil passages
• Replacing the ECM

Common Mistake

Replacing the deactivation solenoid when insufficient oil pressure or faulty wiring is causing the ECM to set this code.
I hope the information in this article has been helpful in pointing you in the right direction to correct the issue with your cylinder 6 deactivation/intake valve control circuit fault code. This article is strictly informational and specific technical data and service bulletins for your vehicle should always take priority.

How severe is this DTC?

The severity of this code can vary significantly from moderate to severe depending on the specific symptoms of the malfunction. A misfire requires immediate attention as it can cause permanent damage to internal engine components.

What are some of the symptoms of the code?

Symptoms of a P3442 trouble code may include:

• The engine may misfire
• Increased fuel consumption
• Poor engine performance
• Service engine soon light illuminated
• Check engine light on

What are some common causes of the code?

Causes

of this P3442 code may include:

• Faulty cylinder deactivation solenoid
• Low engine oil level or pressure
• Restricted oil passage
• Faulty or damaged wiring
• Corroded, damaged, or loose connector
• Faulty ECM

What are the troubleshooting steps for P3442?

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 engine. In some circumstances, this can save you considerable time in the long run by pointing you in the right direction.

The second step is to check the engine oil condition and confirm it is maintained at the proper level. Then locate all components associated with the cylinder 6 deactivation intake valve control circuit and look for obvious physical damage. Based on the specific vehicle, this circuit may incorporate multiple components, including the deactivation solenoid, switches, fault indicators, and the ECM. Perform a thorough visual inspection to check that the associated wiring shows no obvious defects such as scraping, rubbing, bare wires, or burn marks. Next, check connectors and connections for security, corrosion, and damaged pins. This process should include all wiring connectors and connections to all components, including the ECM. Consult vehicle-specific technical data to verify the configuration of the cylinder 6 deactivation/intake control circuit and confirm each component incorporated into the circuit, which may include a fuse or fusible link.

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 Checks

Reference voltage and acceptable ranges can 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 establish 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, shorted, or corroded and should be repaired or replaced.

What are the common repairs for this code?

• Replacing the deactivation solenoid
• Cleaning corrosion from connectors
• Repairing or replacing faulty wiring
• Changing oil and filter
• Cleaning blocked oil passages
• Replacing the ECM

Common Mistake

Replacing the deactivation solenoid when insufficient oil pressure or faulty wiring is causing the ECM to set this code.
I hope the information in this article has been helpful in pointing you in the right direction to correct the issue with your cylinder 6 deactivation/intake valve control circuit fault code. This article is strictly informational, and the technical data and service bulletins specific to your vehicle should always take priority.

Symptoms

Symptoms of a DTC P2800 may include:

• Illumination of the malfunction indicator light (MIL) with DTC code set P2800
• Backup lights may not work
• It may be necessary to move the shift lever slightly up and down for better contact to allow the starter to engage and start the engine.
• It may be impossible to engage the starter
• In some cases, the engine only starts in neutral
• May start in any gear
• Irregular shift RPMs
• Decreased fuel economy
• The transmission may show delayed engagement
• Toyota vehicles, including trucks, may display erratic instrument readings

Potential Causes

Causes

of this DTC may include:

• TRS “B” is loose and poorly adjusted
• The transmission range sensor “B” is faulty
• Bad connector to the external TRS “B”, loose, corroded, or bent pins
• Wiring harness shorted to the external sensor due to rubbing on the transmission linkage
• Blockage in the TRS port of the internal valve body or faulty sensor

Diagnostic Steps

and Possible Solutions

Replacing an internal TRS requires using a Tech II for diagnosis, followed by draining the transmission and removing the pan. The sensor is located at the bottom of the valve body, which is responsible for all transmission functions. The sensor is continuously immersed in hydraulic fluid, which causes housing issues. Often, hydraulic flow is restricted or the O-ring has caused the problem.

In any case, this is a complicated process best left to a transmission specialist.

Replacing External Transmission Range Sensors:

• Block the wheels and set the parking brake.
• Place the transmission in neutral
• Locate the transmission shift linkage. On front-wheel drive vehicles, it will be located on top of the transaxle. On rear-wheel drive vehicles, it will be on the driver’s side
  Remove the electrical connector from the TRS sensor and inspect it carefully. Look for corroded, bent, or pushed back (missing) pins in the sensor. Check the connector on the harness for the same, but in this case, there are female ends that must be in place. The harness connector can be replaced separately if it cannot be saved by cleaning or straightening the female connectors.
• Apply a small amount of dielectric grease to the connector before reconnecting
• Look at the wiring harness location and ensure it is not rubbing on the shift linkage. Check for broken or shorted wires due to lack of insulation
• Check that the sensor is not loose. If it is loose, set the parking brake and the transmission in neutral. Turn the key and rotate the TRS until the backup lights come on. At this point, tighten the two TRS bolts. If the vehicle is a Toyota, you must rotate the TRS until a 5 mm drill bit fits into the housing hole before tightening it
  Remove the nut holding the shift lever and lift the lever
• Remove the electrical connector from the sensor
• Remove the two bolts securing the sensor to the transmission. Unless you want to practice magic and turn this ten-minute job into several hours, do not drop the two bolts into no man’s land
• Lift the sensor from the transmission
• Look at the new sensor and ensure the markings on the shaft and housing, where it is marked “neutral,” are aligned
• Install the sensor on the shift lever shaft and install and tighten the two bolts
• Plug in the electrical connector
• Reinstall the shift lever and tighten the nut
• Additional note: The external TR sensor found on some Fords may be referred to as an MLPS or manual lever position sensor.

Related Transmission Range Sensor Codes: P2801, P2802, P2803, and P2804.

Symptoms

and severity of the code

Because the neutral safety switch is part of the transmission range sensor, the vehicle may start in any gear position and/or the PCM will force the transmission into “limp” mode. In this mode, there is a noticeable lack of power, especially from a complete stop.

There is a serious safety issue when this code is present due to the possibility of the vehicle starting in gear, causing it to move upon starting. This issue must be fixed immediately.

Causes

Potential causes

for setting this code are as follows:

• Faulty transmission range sensor “B”
• Misadjusted transmission range sensor “B”
• Open or shorted transmission range sensor wiring
• Faulty PCM

Diagnostic and repair procedures

There are two possible conditions that will cause this code to be set:

Condition #1- The PCM detects drive or reverse gear when starting the vehicle

Condition #2- The PCM detects park or neutral and the following conditions exist for 10 seconds or more:> Throttle position is 5% or more:> Engine torque is greater than 50 ft-lb. > Vehicle speed is greater than 20 mph

Based on my experience, this code is most common on four-wheel drive trucks that have been “four-wheeling” and have suffered damage to the range sensor and/or wiring harness. It would be very rare for a faulty PCM to cause this code. Diagnosing this code is quite simple. SET THE PARKING BRAKE.

Begin with a thorough visual inspection of the range sensor and cable harness. Repair any damage found. Does the vehicle start in reverse/drive? If it starts, unplug the range sensor and try to restart it in reverse/drive. If it still starts, suspect a short circuit in the harness. If it doesn’t start, suspect a faulty or misadjusted range sensor.

Related transmission range sensor codes: P2800, P2802, P2803 and P2804.

Symptoms and Severity of the Code

The engine may not start due to the park/neutral switch, which is internal to most transmission range sensors. It may experience irregular shifting or even potentially start in gear. There could also be a lack of power because the transmission controls are in “limp home” mode.

There is certainly a safety factor to consider in association with this code, and it should be repaired as soon as possible.

Causes

Potential causes for setting this code are as follows:

• Faulty transmission range sensor “B”
• Open or shorted wiring
• Misadjusted transmission range sensor “B”
• Faulty PCM

Diagnostic and Repair Procedures

To diagnose this code, we first need to have a basic understanding of two things:

1. What is an open circuit?

An open circuit is a circuit that does not form a complete loop from the battery negative to the battery positive. For example, when a light bulb stops working because the filament has broken in two, the circuit would be open at the broken filament.

2. What is a short circuit?

A short circuit occurs when the battery negative comes into contact with the battery positive without any type of load between them. In other words, there must be a component (i.e., a light, motor, sensor, etc.) in the circuit. A short circuit is like dropping a key on top of your car battery, and it touches both terminals and sparks. This is called a direct short.

Now, with basic circuit 101 aside, refer to the diagram below. An open circuit at point A, B, or C would cause low voltage at the PCM. A short circuit at the same points would cause a blown fuse and again low voltage at the PCM. Both of these conditions will set the DTC P2802.

To check the exact cause of the DTC, simply check the voltage at points A, B, and C. If there is voltage at A and B but not at C, suspect a faulty range sensor. If there is voltage at C, suspect shorted wiring or, in rare cases based on my experience, a faulty PCM. If there is voltage at A, check only the fuses.

Related Transmission Range Sensor Codes: P2800, P2801, P2803, and P2804.

The fault code P0705 is related to the transmission range sensor “B”, which is responsible for detecting the position of the gear lever in an automatic transmission. This code indicates a problem with the signal that the sensor sends to the powertrain control module (PCM) or the transmission control module (TCM).

Symptoms associated with code P0705:

• Check Engine Light illuminated.
• Noticeable loss of power, especially during acceleration from a complete stop, as the transmission starts in third gear instead of first gear. This results in slow starts and can make driving difficult.
• Erratic gear shifting or delayed gear changes.
• Disconnection of certain transmission functions, which can make driving more uncomfortable.

If you continue to drive the vehicle without performing the repair, it could lead to serious internal transmission damage, such as premature wear of internal components or complete transmission failure.

Potential causes of code P0705:

1. Faulty transmission range sensor “B”:
   • This sensor sends information to the PCM/TCM about the current position of the gear lever. If the sensor is faulty, it may send incorrect information, leading to abnormal transmission behavior.
2. Misadjusted transmission cable/linkage:
   • If the cable or linkage connecting the gear lever to the transmission is misadjusted, it can interfere with the sensor’s ability to correctly detect the transmission position.
3. Damaged wiring:
   • Damaged wires or connectors between the range sensor and the PCM/TCM can prevent the proper transmission of signals, causing malfunctions.
4. Misadjusted range sensor:
   • If the transmission range sensor “B” is misadjusted, it may not correctly detect the gear lever position and send an erroneous signal to the PCM/TCM.
5. (Rarely) PCM or TCM failure:
   • Although not very common, a faulty transmission control module (TCM) or powertrain control module (PCM) could be the cause of code P0705, especially if a short circuit has damaged the module.

Diagnostic and repair procedures:

1. Checking wiring and connectors:
   • Carefully inspect the wires and connectors between the range sensor and the PCM/TCM. Look for signs of corrosion, cuts, or disconnection. If a wire is damaged, replace it.
2. Testing the range sensor:
   • Use a digital voltmeter to test the sensor signal. In the KOEO (Key On, Engine Off) position, each gear position should send a distinct voltage signal. If a signal is present in multiple gear positions, it may indicate a faulty range sensor.
3. Checking transmission linkage and cable:
   • Check if the cable or linkage connecting the gear lever to the transmission is properly adjusted and functional. If misadjusted, readjust or repair it.
4. Testing PCM/TCM failure:
   • If, after checking the sensor and wiring, you suspect a PCM or TCM failure, it is important to test the module. However, the likelihood of PCM/TCM failure is low, so it is better to start by checking simpler items like the sensor and wiring.

Summary:

Code P0705 is caused by a problem with the transmission range sensor “B”, affecting the transmission’s ability to correctly detect gear lever positions. This can lead to erratic transmission behavior, such as starting in third gear, which can damage the transmission in the long term. To repair the code, check the range sensor, wiring, transmission linkage, and ensure everything is functioning correctly. If necessary, test or replace the range sensor and readjust any faulty cables or connectors.

Symptoms and Severity of the Code

After the second key cycle, the PCM/TCM will illuminate the check engine light and force the transmission into “limp-home” or “safe-mode.” There will be an obvious loss of power, more noticeable when taking off from complete stops. In this mode, the transmission starts in third gear, which is hard on the internal clutches of the transmission.

From my experience, this can cause serious internal damage to the transmission, so it should be fixed as soon as possible. Avoid using the vehicle until repairs can be made.

Causes

Potential causes for setting this code are as follows:

• Faulty transmission range sensor “B”
• Faulty “B” wiring
• (Rarely) Faulty PCM or TCM

Diagnostic and Repair Procedures

The transmission range sensor receives a 12-volt signal from the ignition switch and then sends a 12-volt signal, on the appropriate circuit based on the gear position, to the PCM/TCM.

P2804 is set when the signal is missing at the PCM/TCM. A scan tool with the ability to read live data is the most accurate way to diagnose this DTC, but if it is not available, here are some things that can be checked with a digital volt-ohmmeter (DVOM). From my experience, the most common cause of intermittent signal issues is related to wiring.

In this case, a close visual inspection of the sensor range wiring harness and the internal contacts of the range sensor connector should be done first and thoroughly. If anything is found suspicious during the inspection, repair the issue, clear the codes, and test the vehicle. If the DTC returns, set the DVOM to volts and probe the appropriate circuits at the PCM/TCM and “wiggle” the harness at and leading to the range sensor. If no intermittent voltage loss is visible on the multimeter, suspect a faulty range sensor.

Related transmission range sensor codes: P2800, P2801, P2802, and P2803.

P2805 Possible Causes

• Faulty transmission range sensor “A”/”B”
• Transmission range sensor “A”/”B” circuit open or shorted
• Poor electrical connection in transmission range sensor ‘A’/’B’ circuit

How to Fix Code P2805

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated check engine light (or service engine soon warning light)

P2805 Meaning

The engine control module (ECM) monitors the transmission range sensor circuit. The ECM sets the OBDII code when the transmission range sensor circuit signal is outside factory specifications.

P2806 Possible Causes

• Transmission range sensor is not properly aligned
• Faulty transmission range sensor
• Transmission range sensor harness is open or short-circuited
• Transmission range sensor circuit has poor electrical connection

How to Fix Code P2806

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check engine light on (or service engine soon warning light)

P2806 Meaning

The engine control module (ECM) monitors the transmission range sensor. The ECM sets the OBDII code when the transmission range sensor alignment signal is outside factory specifications.

How severe is this DTC?

The severity of this code typically starts as moderate but can quickly escalate to a more severe level if not corrected promptly.

What are some of the symptoms of the code?

Symptoms of a P2809 trouble code may include:

• Vehicle enters limp mode
• Transmission slips when shifting gears
• Transmission overheating
• Transmission jerks
• Reduced fuel economy
• Symptoms resembling misfires
• Check engine light illuminated

What are some common causes of the code?

Causes of this P2809 transmission code may include:

• Faulty pressure control solenoid
• Dirty or contaminated fluid
• Dirty or clogged transmission filter
• Faulty transmission pump
• Faulty transmission valve body
• Restricted hydraulic passages
• Corroded or damaged connector
• Faulty or damaged wiring
• Faulty PCM

What are the troubleshooting steps for P2809?

Before starting the troubleshooting process for any malfunction, you should research technical service bulletins (TSBs) for the specific vehicle by year, model, and transmission. In some circumstances, this can save you significant time in the long run by pointing you in the right direction. You should also check the vehicle records to verify when the filter and fluid were last changed if possible.

Fluid and Wiring Inspections

The first step is to check the fluid level and examine the condition of the fluid for contamination. Before changing the fluid, you should check the vehicle records to verify when the filter and fluid were last changed.

A detailed visual inspection to check the condition of the wiring for obvious defects is next. Check connectors and connections for security, corrosion, and damaged pins. This should include all wiring and connectors for the transmission pressure control solenoids, transmission pump, and PCM. Depending on the configuration, the transmission pump may be electric or mechanical.

Advanced Steps

Advanced steps always become very vehicle-specific and require appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and vehicle-specific technical references. You should obtain troubleshooting guidelines specific to your vehicle before proceeding with advanced steps. Voltage requirements can be very model-specific. Fluid pressure requirements will also vary depending on transmission design and configuration.

Continuity Checks

Unless otherwise indicated in the technical data, normal readings for wiring and connections should be 0 ohms resistance. Continuity checks should always be performed with power disconnected from the circuit to avoid shorting the circuit and creating more damage. Resistance or lack of continuity indicates faulty wiring that is open or shorted and should be repaired or replaced.

What are the common repairs for this code?

• Replacing fluid and filter
• Replacing faulty pressure control solenoid
• Repairing or replacing faulty transmission pump
• Repairing or replacing faulty transmission valve body
• Flushing transmission to clean passages
• Cleaning corrosion from connectors
• Repairing or replacing wiring
• PCM replacement

Possible misdiagnosis may include:

• Engine misfire issue
• Transmission pump problem
• Internal transmission problem
• Transmission problem

Hopefully, the information in this article has been helpful in pointing you in the right direction to correct the issue with your pressure control solenoid trouble code. This article is strictly informational, and technical data and service bulletins specific to your vehicle should always take priority.