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 responsible for circulating transmission fluid to cool and lubricate the transmission, especially during stop-start events or low engine RPM. The powertrain control module (PCM) monitors the motor's current draw; if it detects a current that is too high or too low, it sets this code. Common causes include a faulty pump motor, wiring issues, or a defective PCM.
01. Most Common Causes
- Faulty auxiliary transmission fluid pump motor
- Open or shorted wiring or connectors in the pump circuit
- Blown fuse or relay for the pump
- Defective PCM
02. Symptoms You Will Notice
- Transmission overheating
- Check Engine Light illuminated
- Reduced fuel economy
- Transmission slipping or harsh shifting
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Visually inspect the pump, wiring, and connectors for damage or corrosion.
Step 3: Test the pump motor's resistance and current draw using a multimeter.
Step 4: Check the fuse and relay for the auxiliary pump.
Step 5: If all else is fine, test the PCM output signal to the pump.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code, as the auxiliary pump failure can lead to transmission overheating and damage.
How much does it cost to fix?▼
The cost to fix P0C26 typically ranges from $50 to $150 for parts and labor, depending on the cause and vehicle.