P0C21 – U-V-W Phase Circuit of Lower Auxiliary Transmission Fluid Pump

P0C21 Possible Causes

  • Faulty auxiliary transmission fluid pump
  • Auxiliary transmission fluid pump harness is open or shorted
  • Poor electrical connection in auxiliary transmission fluid pump circuit

What Does It Mean?

How to Fix Code P0C21

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

P0C21 Possible Symptoms

Check engine light on (or service engine soon warning light)

P0C21 Meaning

The engine control module (ECM) monitors the auxiliary transmission fluid pump. The ECM sets the OBDII code when the auxiliary transmission does not meet factory specifications.

P0C22 – High Auxiliary Transmission Fluid Pump Phase U-V-W Circuit

P0C22 Possible Causes

  • Faulty auxiliary transmission fluid pump
  • Auxiliary transmission fluid pump harness is open or shorted
  • Poor electrical connection in auxiliary transmission fluid pump circuit

What Does It Mean?

How to Fix Code P0C22

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

P0C22 Possible Symptoms

Check Engine Light on (or Service Engine Soon warning light)

P0C22 Meaning

The Engine Control Module (ECM) monitors the auxiliary transmission fluid pump. The ECM sets the OBDII code when the auxiliary transmission does not meet factory specifications.

P0C23 – Auxiliary Transmission Fluid Pump Control Module Circuit / Open

P0C23 Possible Causes

  • Faulty auxiliary transmission fluid pump control module
  • Auxiliary transmission fluid pump control module harness is open or shorted
  • Poor auxiliary transmission fluid pump control module circuit electrical connection

What Does It Mean?

How to Fix Code P0C23

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0C23 Possible Symptoms

Check engine light on (or service engine soon warning light)

P0C23 Meaning

The engine control module (ECM) monitors the auxiliary transmission fluid pump. The ECM sets the OBDII code when the auxiliary transmission does not meet factory specifications.

P0C24 – Lower Auxiliary Transmission Fluid Pump Control Module Circuit

P0C24 Possible Causes

  • Faulty auxiliary transmission fluid pump control module
  • Auxiliary transmission fluid pump control module harness is open or shorted
  • Poor electrical connection in auxiliary transmission fluid pump control module circuit

What Does It Mean?

How to Fix Code P0C24

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

P0C24 Possible Symptoms

Check engine light on (or service engine soon warning light)

P0C24 Meaning

The engine control module (ECM) monitors the auxiliary transmission fluid pump. The ECM sets the OBDII code when the auxiliary transmission does not meet factory specifications.

P0C25 – Auxiliary High Transmission Fluid Pump Control Module Circuit

P0C25 Possible Causes

  • Faulty auxiliary transmission fluid pump control module
  • Auxiliary transmission fluid pump control module harness is open or shorted
  • Poor electrical connection in auxiliary transmission fluid pump control module circuit

What Does It Mean?

How to Fix Code P0C25

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

P0C25 Possible Symptoms

Check engine light on (or service engine soon warning light)

P0C25 Meaning

The engine control module (ECM) monitors the auxiliary transmission fluid pump. The ECM sets the OBDII code when the auxiliary transmission does not meet factory specifications.

P0C26 – Auxiliary Transmission Fluid Pump Motor Current

P0C26 Possible Causes

  • Faulty auxiliary transmission fluid pump
  • Auxiliary transmission fluid pump harness is open or shorted
  • Poor electrical connection in auxiliary transmission fluid pump circuit

What Does It Mean?

How to Fix Code P0C26

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

P0C26 Possible Symptoms

Check engine light on (or service engine soon warning light)

P0C26 Meaning

The Engine Control Module (ECM) monitors the auxiliary transmission fluid pump. The ECM sets the OBDII code when the auxiliary transmission does not meet factory specifications.

P0C27 – Electric Transmission Fluid Pump Motor Control Module

P0C27 Possible Causes

  • Faulty electronic transmission fluid auxiliary pump
  • Electronic transmission fluid auxiliary pump harness is open or shorted
  • Poor electrical connection in electronic transmission fluid auxiliary pump circuit

What Does It Mean?

How to Fix Code P0C27

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0C27 Possible Symptoms

Check engine light on (or service engine soon warning light)

P0C27 Meaning

The electronic transmission fluid auxiliary pump is used to keep the transmission engaged when the engine is stopped and the transmission is running. The Transmission Control Module (TCM) monitors the electronic transmission fluid auxiliary pump control circuit. The TCM sets the OBDII code when the signal from the electronic transmission fluid auxiliary pump control circuit is outside factory specifications.

P0C28 – Low Transmission Fluid Pump Motor Current

P0C28 Possible Causes

  • Faulty electronic transmission fluid auxiliary pump
  • Electronic transmission fluid auxiliary pump harness is open or shorted
  • Poor electrical connection in electronic transmission fluid auxiliary pump circuit

What Does It Mean?

How to Fix Code P0C28

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0C28 Possible Symptoms

Check engine light on (or service engine soon warning light)

P0C28 Meaning

The electronic transmission fluid auxiliary pump is used to keep the transmission engaged when the engine is stopped and the transmission is running. The Transmission Control Module (TCM) monitors the electronic transmission fluid auxiliary pump control circuit. The TCM sets the OBDII code when the signal from the electronic transmission fluid auxiliary pump control circuit is outside factory specifications.

P0C29 – High Current in the Electric Transmission Fluid Pump Motor

Error Code P0C29: Problems and Solutions

Meaning of Code P0C29

The error code P0C29 is related to the electronic transmission fluid auxiliary pump. This pump is used to keep the transmission engaged when the engine is stopped and the transmission is running.

The Transmission Control Module (TCM) monitors the control circuit of this pump. When the circuit signal is outside factory specifications, the TCM triggers the error code P0C29.

Possible Symptoms

  • Engine light on (or “Service Engine Soon” warning light).

Possible Causes

  • Faulty electronic transmission fluid auxiliary pump.
  • Open or shorted auxiliary pump wiring harness.
  • Poor electrical connection in the auxiliary pump circuit.

How to Fix Code P0C29?

  1. Check the possible causes mentioned above.
  2. Visually inspect the wiring harness and associated connectors.
  3. Check for any damaged components.
  4. Look for broken, bent, pushed out, or corroded connector pins.

If the problem persists after these checks, it may be necessary to consult a professional for further diagnosis.

P0C2A – Stalled Electric Transmission Fluid Pump Motor

Error Code P0C2A: Problems and Solutions

Meaning of Code P0C2A

The error code P0C2A is related to the electronic transmission fluid auxiliary pump. This pump is used to keep the transmission engaged when the engine is stopped and the transmission is running.

The Transmission Control Module (TCM) monitors the control circuit of this pump. When the circuit signal is outside factory specifications, the TCM triggers the error code P0C2A.

Possible Symptoms

  • Engine light on (or “service engine soon” warning light).

Possible Causes

  • Faulty electronic transmission fluid auxiliary pump.
  • Open or shorted auxiliary pump wiring harness.
  • Poor electrical connection in the auxiliary pump circuit.

How to Fix Code P0C2A?

  1. Check the possible causes mentioned above.
  2. Visually inspect the wiring harness and associated connectors.
  3. Check for any damaged components.
  4. Look for broken, bent, pushed out, or corroded connector pins.

If the problem persists after these checks, it may be necessary to consult a professional for further diagnosis.