The automobile fault code P0C21 indicates a problem with the Auxiliary Transmission Fluid Pump.

This can be identified by the Engine Light or Service Engine Soon Warning Light turning on. The cause of this fault code could be a faulty pump, an open or shorted harness, or a poor electrical connection in the pump circuit. To fix this issue, it is recommended to visually inspect the wiring harness and connectors for any damage.

Look out for broken, bent, pushed out, or corroded pins in the connectors.

The repair time for this problem is estimated to be around 1.0 hour. It is important to address this issue promptly to prevent further damage to the transmission system.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p0c21 fault code.

  • The symptoms of the automobile fault code p0c21 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code p0c21 can be caused by a faulty auxiliary transmission fluid pump, an open or shorted harness, or a poor electrical connection in the pump circuit.

  • The fault code p0c21 can be caused by: a faulty auxiliary transmission fluid pump, an open or shorted harness for the auxiliary transmission fluid pump, and a poor electrical connection in the auxiliary transmission fluid pump circuit.

To fix the automobile fault code p0c21, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p0c21, first, check the possible causes mentioned above.
  • Then, visually inspect the wiring harness and connectors related to the issue.
  • Look for any damaged components and check for broken, bent, pushed out, or corroded pins in the connectors.
  • This fix is estimated to take approximately 1.0 hour.

The factors influencing the cost of diagnosing and fixing the automobile fault code p0c21 are the estimated repair time and the hourly rate charged by auto repair shops. The estimated repair time for this fault code is 1.0 hour. Auto repair shops typically charge between $75 and $150 per hour for their services.

These factors will determine the overall cost of diagnosing and fixing the p0c21 fault code.

The P0C21 fault code refers to a problem with the Auxiliary Transmission Fluid Pump in your vehicle.

The Engine Control Module (ECM) is responsible for monitoring this pump, and if it detects that the Auxiliary Transmission is not operating within the factory specifications, it will set the P0C21 code.

This code specifically indicates a low voltage condition in the U-V-W circuit of the Auxiliary Transmission Fluid Pump. When this fault code is triggered, it means that there is an issue with the electrical circuitry of the Auxiliary Transmission Fluid Pump. The low voltage condition in the U-V-W circuit can be caused by a variety of factors, such as a faulty pump motor, damaged wiring, or a malfunctioning ECM.

It is important to address this issue promptly, as it can lead to poor performance or even failure of the Auxiliary Transmission system.

A qualified technician will be able to diagnose the exact cause of the problem and recommend the necessary repairs or replacements to resolve the P0C21 fault code.

What are the possible causes for the automobile fault code p0c21?

If you see the engine light or service engine soon warning light on, the fault code P0C21 could be the culprit. This code is often caused by a faulty auxiliary transmission fluid pump, an open or shorted harness, or a poor electrical connection in the pump circuit. To fix the issue, visually inspect the wiring harness and connectors, checking for any damage or corrosion. Also, look out for broken, bent, pushed out, or corroded pins in the connectors. Don’t forget to check the possible causes mentioned above.

How can I visually inspect the wiring harness and connectors to fix the fault code p0c21?

If you’re dealing with the fault code p0c21 and your engine light is on, it’s time to visually inspect the wiring harness and connectors. This code is often caused by a faulty auxiliary transmission fluid pump or issues with the pump’s harness. To fix it, check for any open or shorted circuits and ensure there are no poor electrical connections. Take a close look at the wiring harness and connectors for any signs of damage, such as broken or corroded pins. Don’t forget to examine the components as well.

What should I look for when checking for damaged components and connector’s pins to resolve the fault code p0c21?

When resolving the fault code p0c21, start by checking for damaged components and connector’s pins. Visually inspect the related wiring harness and connectors, looking for any signs of damage such as broken, bent, pushed out, or corroded pins. This can help identify if the cause of the fault code is a faulty auxiliary transmission fluid pump, an open or shorted harness, or a poor electrical connection. Take the time to thoroughly examine these areas to ensure a proper fix.

p0c21 error fault code explained

To fix the p0c21 fault code, start by visually inspecting the wiring harness and connectors. Look for any damage or corrosion. Check for broken, bent, pushed out, or corroded connector pins.

This will help identify any issues with the faulty auxiliary transmission fluid pump or its circuit.

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