Auxiliary Transmission Fluid Pump Motor Current Fault
The P0C26 code indicates a problem with the current of the auxiliary transmission fluid pump motor. This pump is typically used in hybrid or electric vehicles to circulate transmission fluid when the main engine is off, ensuring proper lubrication and cooling. The diagnostic trouble code (DTC) is set when the powertrain control module (PCM) detects that the pump motor current is outside the expected range, which could be due to a faulty pump motor, wiring issues, or a malfunctioning control module.
1. Symptoms You Will Notice
- Transmission overheating or slipping
- Check Engine Light illuminated
- Reduced fuel economy or hybrid system warning
2. Most Common Causes
- Internal failure of the auxiliary transmission fluid pump motor
- Short circuit, open circuit, or abnormal resistance in the pump motor circuit wiring
- Corroded, loose, or moisture-contaminated connectors in the auxiliary pump harness
- Faulty transmission control module (TCM) or associated power inverter
- Low, degraded, or incorrect transmission fluid level causing excessive pump load
- Damaged fuse or relay in the auxiliary pump circuit
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Visually inspect the pump and wiring for damage or corrosion.
Step 3: Test the pump motor resistance and current draw with a multimeter.
Step 4: Check the pump relay and fuse for proper operation.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can lead to transmission damage due to inadequate lubrication and cooling.
How much does it cost to fix?▼
The cost to fix this issue typically ranges from $50 to $150 for parts and labor, depending on the specific cause and vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.