Auxiliary Transmission Fluid Pump Control Module Feedback Signal Issue
The P0C2B code indicates a problem with the feedback signal from the auxiliary transmission fluid pump control module. This pump is typically found in hybrid vehicles to circulate transmission fluid when the engine is off. The control module monitors pump operation and reports back to the main transmission control module. A faulty signal can lead to improper pump operation, affecting transmission cooling and lubrication, potentially causing transmission damage.
01. Most Common Causes
- Faulty auxiliary transmission fluid pump control module
- Wiring or connector issues in the pump control circuit
- Defective auxiliary transmission fluid pump
- Low transmission fluid level or contamination
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission overheating or slipping
- Reduced fuel economy
- Hybrid system warning light
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the auxiliary pump control module power and ground circuits.
Step 4: Verify transmission fluid level and condition.
Step 5: Use a scan tool to command the pump on/off and monitor feedback signal.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving could lead to transmission overheating and damage, especially in hybrid vehicles that rely on the auxiliary pump for cooling when the engine is off.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the root cause. Replacing the pump control module or pump itself can be more expensive.