Fault code P0C2D – auxiliary transmission fluid pump control module feedback signal low

Fault code P0C2D is called “Auxiliary Transmission Fluid Pump Control Module Feedback Signal Low” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P0C2D

This diagnostic trouble code (DTC) is a generic transmission code. Error P0C2D is considered a general code because it applies to all makes and models of vehicles. Although the specific repair steps may vary slightly depending on the model.

Fault code P0C2D – auxiliary transmission fluid pump control module feedback signal low

Modern vehicles have an automatic transmission control module called a transmission control module (TCM). The Powertrain Control Module (PCM) communicates with the TCM. To monitor the automatic transmission for malfunctions.

If your vehicle retains code P0C2D, it means that the powertrain control module (PCM) has not received a data input feedback signal. Which indicates that a problem has been detected that requires the malfunction indicator lamp (MIL) to turn on.

The transmission controller sets an OBDII code when the electronic transmission auxiliary pump control circuit signal does not meet factory specifications.

The transmission controller activates this fault when the auxiliary transmission pump control module circuit signal does not meet factory specifications. In this case the fault is related to the feedback signal.

Some models may require up to 8 drive cycles with the problem before the malfunction indicator will illuminate.

Symptoms of vehicle malfunctions

The main signal that an error P0C2D has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. Gear mode switch does not work.
  2. Unstable or abrupt gear shifting.
  3. Takes a long time to shift gears.
  4. Low power at high load.
  5. Transmission may be put into emergency mode.

A stored P0C2D code indicates that a potentially serious fault has been detected. This can cause the transmission and its components to fail.

Factors that can cause this error code

The error code P0C2D can mean that one or more of the following problems have occurred:

  • Transmission fluid auxiliary pump control module is defective.
  • Defective auxiliary transmission fluid pump.
  • Corrosion of connectors or contacts causing high resistance.
  • Wiring problem, e.g. breakage.
  • Defective transmission fluid pump control relay.
  • Blown fuse or fusible link.
  • Sometimes faulty PCM or TCM module is the cause.

How to fix or reset OBD-2 code P0C2D

Some suggested steps for troubleshooting and fix the error code P0C2D:

  1. Connect an OBD-II scanner to the vehicle’s diagnostic connector and read all stored data and error codes.
  2. Clear the error codes, perform a test drive, and check if the P0C2D fault appears again.
  3. Visually inspect the electrical wires and connectors.
  4. If necessary, repair or replace any shorted, broken, damaged, or corroded components.
  5. Test the auxiliary transmission fluid pump control module.
  6. Check the fuse or fusible link.
  7. Inspect the auxiliary transmission fluid pump.
  8. Test the pump control relay.

Diagnose and repair of problems

The first thing to do when starting to diagnose a P0C2D fault is to check the electrical section for damage. In today’s vehicles, electrical and electronic signals require good cabling for proper data transmission. Any malfunctions, such as breaks, disconnected connectors, or corrosion, can interrupt signals, causing transmission control failures.

Check the battery pack, as some PCM and TCM modules are sensitive to low voltage. If the battery is low, the system may detect this as a failure. Make sure the battery is delivering at least 12 volts and that the alternator is running properly, at least 13 volts at idle.

If the vehicle does not detect a failure caused by faulty wiring, the problem is most likely with the auxiliary transmission fluid pump control module. Its replacement should solve the problem with the P0C2D error. But don’t overlook fuses either, because a blown fuse is a common problem.

As with any transmission malfunction, always make sure the fluid levels and quality are at the proper level, and keep them in good condition.

On which vehicles does this problem occur most frequently

Fault code P0C2D can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Audi
  • Porsche
  • Volkswagen

Fault code P0C2D can sometimes be found with other errors. The most common are the following: P0C2B, P0C2C, P0C2E.

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