Auxiliary Transmission Fluid Pump Motor Stalled
The P0C2A code indicates that the auxiliary transmission fluid pump motor has stalled or is not operating as expected. This pump is typically used in hybrid or start-stop vehicles to maintain transmission fluid pressure when the engine is off. A stalled motor can lead to insufficient lubrication and cooling, potentially causing transmission damage.
01. Most Common Causes
- Faulty auxiliary transmission fluid pump motor
- Wiring or connector issues (open/short circuit)
- Low transmission fluid level or contamination
- Failed pump control module or relay
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission slipping or harsh shifting
- Reduced fuel economy
- Vehicle may not restart after stop-start event
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 or corrosion.
Step 3: Check transmission fluid level and condition; top up or replace if necessary.
Step 4: Test pump motor operation using a scan tool or by applying direct power/ground.
Step 5: If motor is inoperative, replace the auxiliary transmission fluid pump assembly.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive for extended periods, as the auxiliary pump failure can lead to transmission overheating and damage. Have the vehicle inspected promptly.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, including parts and labor. The pump itself costs $100-$300, and labor adds $100-$300 depending on vehicle accessibility.