Auxiliary Transmission Fluid Pump Temp Sensor Circuit Low
The P0C1E code indicates that the control module for the auxiliary transmission fluid pump has detected a low voltage or resistance in the internal temperature sensor circuit. This sensor monitors the temperature of the pump's internal components to prevent overheating. A low circuit condition typically means the signal voltage is below the expected range, which can be caused by a short to ground, a faulty sensor, or wiring issues. This can lead to inaccurate temperature readings, potentially causing the pump to operate incorrectly or fail, affecting transmission cooling and performance.
01. Most Common Causes
- Faulty auxiliary transmission fluid pump internal temperature sensor
- Short to ground in the sensor circuit wiring
- Corroded or damaged connector at the pump module
- Open circuit in the sensor signal wire
- Failed auxiliary transmission fluid pump control module
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission shifting issues or harsh shifts
- Reduced fuel economy
- Transmission overheating or warning messages
- Auxiliary pump not operating when needed
03. Step-by-Step Diagnosis
Step 1: Connect a scan tool and verify the P0C1E code. Check for any related codes.
Step 2: Inspect the auxiliary transmission fluid pump connector and wiring for damage, corrosion, or shorts to ground.
Step 3: Measure the resistance of the temperature sensor at the pump connector. Compare to manufacturer specifications.
Step 4: If sensor resistance is out of range, replace the auxiliary transmission fluid pump assembly (sensor is integral).
Step 5: If sensor is okay, check for continuity and shorts in the wiring between the pump and control module. Repair as needed.
Step 6: If wiring and sensor are fine, replace the auxiliary transmission fluid pump control module.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can lead to transmission overheating and damage. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but if the pump module needs replacement, it can be higher.