Auxiliary Transmission Fluid Pump Control Module Circuit High
The P0C25 code indicates a high voltage condition in the auxiliary transmission fluid pump control module circuit. This module manages the electric pump that circulates transmission fluid when the engine is off (e.g., in hybrid vehicles). A high circuit voltage typically points to a short to power, faulty module, or wiring issue. This can lead to transmission overheating or failure if not addressed.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission overheating or slipping
- Reduced fuel economy
2. Most Common Causes
- Short to battery voltage in the control circuit
- Faulty auxiliary transmission fluid pump control module
- Damaged wiring or connector corrosion
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Visually inspect the auxiliary pump wiring and connectors for damage or corrosion.
Step 3: Test the control module power and ground circuits with a multimeter for high voltage.
Step 4: If wiring is okay, replace the auxiliary transmission fluid pump control module.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with this code can cause transmission damage due to inadequate fluid circulation, especially in stop-and-go traffic.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Replacing the control module may add $200-$500, depending on the vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.