P0878 - OBD Trouble Code

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The trouble code P0878 can be explicated as Transmission Fluid Pressure Sensor/Switch "D" Circuit High. This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

The brighter you are, the more you have to learn! That’s why we are here to provide you more knowledge about the P0878 trouble code. The P0878 is an OBD-II generic code and it will appear if transmission fluid would increase or decrease to a level that is not within the limits which have been programmed.

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

• Issue of low transmission fluid level
• There can be inoperative pump
• Unusable or sliding transmission
• Transmission temperature sensor might be flawed
• There can be distorted PCM
• There might be a lot of heat in the car engine

1. Auto Transmission Control Module - OBD Code P0878 can appear because of faulty Auto Transmission Control Module.
2. Auto Transmission Valve Body Kit - There can be some issues with the Auto Transmission Valve Body Kit due to which you may see P0878 code appearing over and over again. Visit us to buy best quality Auto Transmission Valve Body Kit online.
3. Body Control Module Component - Are you facing some faults in your Body Control Module Component? Don’t worry and get them replaced or else P0878 code can turn up.
4. Auto Transmission Shift Solenoid - Common cause behind this P0878 error code can be some fault in Auto Transmission Shift Solenoid. So, it will be a good decision to replace them now.
5. Electronic Control Unit - ECM is perfectly fine but still but having that trouble code P0878 flashing? In such a situation your Electronic Control Unit might be faulty. Why don’t you think of getting that replaced?
6. Powertrain Control Module - The P0878 code can also arise due to some issues in Powertrain Control Module. So, it is advised to replace them as soon as possible.
7. Oil Pressure Sender - P0878 code does not really end up spoiling your PCM, but it might also accompany few Oil Pressure Sender issues. We have best Oil Pressure Sender with us.
8. Fuel Pressure Sensor - Are you facing OBD Error Code P0878? Don’t worry as you can fix this issue with new Fuel Pressure Sensor. We care for our customers, that’s why we have Fuel Pressure Sensor for every make and model.

It is essential 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 P0878 here:

Common Symptoms

• Check engine light might come into signal
• The transmission fluid might start overheating
• Appearance of the smoke from the transmission
• The transmission might not engage properly
• Slipping of the transmission
• Driver might put the vehicle into gear

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0878:

• It is very important to rebuild the transmission
• You must fix the defective components, wiring, or connectors
• Make sure to mend the faulty torque converter
• It is essential to restore the flawed PCM
• Rehabilitate the defaults in the transmission temperature sensor

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

• A suitable OBD-II scanner (or code reader) and a digital volt/ohmmeter will be most helpful in performing a successful diagnosis. Use the vehicle information source to search for applicable technical service bulletins (TSB).
• 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 P0878 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 P0878 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.

Common Mistakes When Diagnosing the P0878 Code

Most of the times the mechanics do not consider that there can be an internal damage with the transmission because of less fluid situation and at the same time they might assume that the faults in the transmission would need restoration when in reality there is just an overheating of the transmission and there is no need to replace it.