Guide To P0873 OBD Error Code Solutions

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The trouble code P0873 can be described as Transmission Fluid Pressure Sensor/Switch "C" Circuit High. This code is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system, especially those made from 1996 up to present. It’s also more common among Audi, Citroen, Chevrolet, Ford, Hyundai, Nissan, Peugeot, and Volkswagen vehicles. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model, powertrain configuration type, to another.

Don’t worry if P0873 error code is triggering again and again. We offer a wide range of auto parts at affordable prices to our dear customers. A voltage signal is received by the PCM/TCM to decide the transmission operating pressure or when a shift is happening. This error code would start triggering up when the "C" input would not match usual operating voltages stored in the memory of the PCM/TCM's. This can also be because of inner mechanical problems which are inside the transmission. You can always refer to the vehicle specific repair manual to decide which is the "C" circuit for your specific automobile.

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

• The transmission fluid might be grimy or polluted
• Excessive heat in the car engine
• There can be some mechanical issues with the transmission system
• There can be inoperative transmission system
• Malfunctioning sensor

1. Oil Pressure Sender - Do you remember when was the last time you got your car Oil Pressure Sender checked up? A dirty Oil Pressure Sender can cause a lot of issues like displaying P0873 code.
2. Auto Transmission Shift Solenoid - Poor Auto Transmission Shift Solenoid can cause a lot of difficulties, so why not get it replaced at time?
3. Fuel Pressure Sensor - Are there some faults in your Fuel Pressure Sensor? Don’t waste time and get them replaced or else P0873 code can turn up.
4. Auto Transmission Valve Body Kit - OBD Code P0873 can appear because of faulty Auto Transmission Valve Body Kit.
5. Electronic Control Unit - Everything is fine with Fuel Pressure Sensor and still P0873 code triggering? Then you must get your Electronic Control Unit checked.
6. Body Control Module Component - There can be some issues with the Body Control Module Component due to which you may see P0873 code appearing over and over again. Visit us to buy best quality Body Control Module Component online.
7. Auto Transmission Control Module - A lot of issues can arise do to defective Auto Transmission Control Module. Did you just see P0873 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
8. Powertrain Control Module - Faulty Powertrain Control Module can be the reason why P0873 code is flashing. Visit us to purchase top notch Powertrain Control Module online.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P0873 code by mentioning some major symptoms below:

Common Symptoms

• Visibility in the check engine light
• There can be a change in movement quality
• Car might begin off in 2nd or 3rd 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 P0873:

• You must fix the leaky segments in the transmission system
• Make sure to mend the faulty components in the transmission system
• It is essential to restore the flawed corroded, broken or faulty wiring related to the transmission system
• Repair or replace the quirky powertrain control module

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

You will require some important things like a diagnostic scanner, a digital volt/ohmmeter, and a reliable vehicle information source to diagnose this trouble code. In some circumstances this can save a lot of time in the long run by pointing you in the right direction.

You can always check the vehicle records to verify the last time that the filter and fluid was changed if possible. 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 P0873 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 P0873 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. Now if all the tests have been passed and still the P0873 error code is appearing, then there is some issue with the TFPS sensor or there can be some failures in the internal transmission as well.

So make sure that you replace the TFPS sensor. If you are not sure about it, then you can always take help from the technician. The PCM/TCM should be programmed properly and at the same time should be calibrated so that it can be installed in a right manner.

Common Mistakes When Diagnosing The P0873 Code

• Many a times the mechanics think that there is some issue with the transmission fluid due to which the P0873 fault code is appearing, but in reality the fluid issues occur because of a defective transmission pump.