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 responsible for circulating transmission fluid when the engine is off (e.g., in hybrid vehicles) to maintain lubrication and cooling. The control module monitors the pump's speed or position feedback; a discrepancy suggests a fault in the pump, wiring, or module itself.
1. Symptoms You Will Notice
- Transmission overheating or slipping
- Check Engine Light illuminated
- Reduced fuel economy
- Transmission warning messages on dashboard
2. Most Common Causes
- Faulty auxiliary transmission fluid pump
- Open or shorted wiring in the pump control circuit
- Failed pump control module
- Poor electrical connections or corroded terminals
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and document freeze frame data.
Step 2: Visually inspect the auxiliary pump wiring and connectors for damage or corrosion.
Step 3: Test the pump's resistance and voltage supply using a multimeter.
Step 4: If wiring is intact, replace the auxiliary transmission fluid pump.
Step 5: Clear codes and test drive to verify repair.
4. 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 inadequate lubrication, especially during start-stop events.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and minor repairs like wiring fixes, but pump replacement can cost $200-$500 or more including labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.