Auxiliary Transmission Fluid Pump Control Module Feedback Signal Issue
The P0C2C code indicates that the Auxiliary Transmission Fluid Pump Control Module has detected a feedback signal that is out of the expected range or performance. This pump is typically used in hybrid or electric vehicles to circulate transmission fluid when the main engine is off, such as during electric-only operation or start-stop events. The control module monitors the pump's speed or pressure feedback to ensure proper operation. A range/performance issue suggests the signal is erratic, missing, or not matching the commanded state, which can lead to inadequate transmission lubrication or cooling.
01. Most Common Causes
- Faulty auxiliary transmission fluid pump
- Wiring or connector issues in the pump control circuit
- Defective pump control module
- Low transmission fluid level or contamination
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission overheating or slipping
- Reduced fuel economy or hybrid system performance
- Unusual noises from the transmission area
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Inspect wiring and connectors to the auxiliary pump for damage, corrosion, or loose connections.
Step 3: Test the pump's electrical resistance and operation using a multimeter or scan tool command.
Step 4: Check transmission fluid level and condition; top off or replace if necessary.
Step 5: If all else is normal, replace the auxiliary transmission fluid pump or control module.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the auxiliary pump failure can lead to transmission damage due to insufficient lubrication, especially in hybrid vehicles that rely on it during electric mode.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, including parts and labor, depending on the vehicle and whether the pump or control module needs replacement.