Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Issue
The P0C1D code indicates that the internal temperature sensor circuit within the auxiliary transmission fluid pump control module is out of range or has a performance issue. This sensor monitors the temperature of the control module to prevent overheating. A fault can cause the module to malfunction, potentially leading to inadequate transmission fluid cooling or pump operation, especially in hybrid or electric vehicles with auxiliary pumps.
01. Most Common Causes
- Faulty internal temperature sensor in the auxiliary transmission fluid pump control module
- Damaged wiring or connectors to the control module
- Control module internal failure
- Overheating of the control module due to external factors
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission overheating or poor shifting performance
- Reduced fuel economy
- Auxiliary pump not operating correctly
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Inspect the wiring and connectors to the auxiliary transmission fluid pump control module for damage or corrosion.
Step 3: Test the internal temperature sensor resistance and compare to manufacturer specifications.
Step 4: If sensor and wiring are okay, 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 with this code as it can lead to transmission overheating and potential damage. Have the vehicle inspected promptly.
How much does it cost to fix?▼
The cost typically ranges from $200 to $600, including parts and labor, depending on the vehicle and whether the control module or pump assembly needs replacement.