Error Code P0879: What It Means & What To Do?

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The trouble code P0879 can be explicated as Transmission Fluid Pressure Sensor/Switch "D" Circuit Intermittent. The transmission fluid pressure sensor is being monitored by the engine control module. It is the engine control module which would set the P0879 trouble code when the transmission fluid pressure sensor/switch 'D' would not be as per the factory specifications.

Do you want to gain some more knowledge about the P0879 trouble code? The transmission fluid pressure sensor/switch is generally situated to the side of the valve body inside the transmission. It might also be found screwed into the side of the transmission case/body itself. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

What causes this problem with the Transmission Fluid Pressure Sensor/Switch "D" Circuit Intermittent?

• The signal circuit to The TFPS sensor might have an intermittent open
• Issues related to the intermittent short to voltage in the signal circuit to the TFPS sensor
• There can be intermittent short to ground in the signal circuit to the TFPS sensor
• Malfunctioning TFPS sensor
• Some issues related to the internal mechanical transmission
• The PCM might be damaged

1. Powertrain Control Module - There can be some issues with the Powertrain Control Module due to which you may see P0879 code appearing over and over again. Visit us to buy best quality Powertrain Control Module online.
2. Oil Pressure Sender - A lot of issues can arise do to defective Oil Pressure Sender. Did you just see P0879 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
3. Fuel Pressure Sensor - Faulty Fuel Pressure Sensor be the reason why P0879 code is flashing. Visit us to purchase top notch Fuel Pressure Sensor online.
4. Auto Transmission Valve Body Kit - It is an important auto part which needs full care. A faulty Auto Transmission Valve Body Kit can be a reason behind the flashing up of P0879 code.
5. Auto Transmission Control Module - OBD Code P0879 can appear because of faulty Auto Transmission Control Module.
6. Body Control Module Component - P0879 error code also relates to problems with the Body Control Module Component. Find Body Control Module Component with us.
7. Auto Transmission Shift Solenoid - OBD Error Code P0879 can simply be due to faulty Auto Transmission Shift Solenoid. Replace old and damage components now!
8. Electronic Control Unit - If there is any fault detected in the Electronic Control Unit then it will flash OBD Code P0879. Replace faulty Electronic Control Unit now!

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0879 here:

Common Symptoms

• The service engine soon light can start lighting up
• There can be a change in shift condition

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• You must fix the defective powertrain control module
• Make sure to mend the faulty oil pressure sender
• It is essential to restore the flawed fuel pressure sensor
• Repair or replace the quirky auto transmission valve body kit
• Rehabilitate the defaults in the auto transmission control module
• Carefully adjust the faults in the body control module component 

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Here are some steps which you should follow in order to diagnose this fault code:

It is very important to use the correct tools to diagnose a problem with a very professional outlook

A diagnostic scanner, a reliable source of vehicle information, and a digital volt/ohmmeter (DVOM) will be required in order to arrive at an accurate diagnosis of a code P0879. You can start the process of diagnosis with the power associated trouble code or with a number of code diagnosis. This might be the reason why P0879 error code is appearing. After that the transmission fluid pressure sensor/switch should be situated on your specific automobile.

The TFPS is generally found attached to the side of the valve body inside the transmission. It can also be situated on the side of the transmission case. Now once it has been located, then the connector as well as wiring should be visually located. You can always search for the wires which are bare, burned spots as well as plastic which has been melted. The connector should be pulled apart and the terminals which are inside the connector should be inspected properly. You must check if they are appearing burnt and if there is a green tint, then it would indicate that there is corrosion.

This can happen if they are attached outside the case of the transmission. An electrical contact cleaner as well as plastic bristle brush should be used to clean the terminals as per the requirement. It should be allowed to dry properly and then electrical grease should be applied at the places where the terminals are in contact. By using a scan tool, all the diagnostic trouble codes should be cleared up from the memory. Then check if the P0879 code has returned or not. If you find out that it is not appearing again, then it would mean that there were some defects in the connections. Now if this error code returns, then you should definitely test the TFPS sensor as well as the related circuits. The electrical connector at the TFPS sensor should be disconnected with the key off.

A digital voltmeter should be connected to the ground or low reference terminal at the TFPS sensor wiring harness connector. Then a read lead should be connected to the digital voltmeter. Then the key should be turned on and then engine should be off. You should carefully check the manufacturer's specifications. The reading of the voltmeter should be either 12 volts or 5 volts. You can always wiggle the connections to check if they are changing or not. Now if the voltage is not correct, then the ground wire should be repaired properly. Make sure to restore the PCM/TCM. Then one lead of an ohmmeter should be connected to the signal terminal at the TFPS sensor. Then the other lead should be connected to the ground at the sensor. You can always inspect the manufacturers specifications on the resistance of the sensor so that the resistance can be properly tested when no pressure has been applied to it. The resistance should be monitored and the connector at the transmission fluid pressure sensor/switch should be wiggled.

Common Mistakes When Diagnosing the P0879 Code

• If the error code P0879 is being diagnosed by a technician, then he might mend the leakage in the transmission and might not realize the less fluid situation which has internally damaged the transmission. 
• This may result in the restoring of the transmission because of the transmission overheating problem