Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit Range/Performance
The P0C1D code indicates that the internal temperature sensor circuit within the auxiliary transmission fluid pump control module is reporting a value outside the expected 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 limit pump operation or trigger a fail-safe mode, potentially affecting transmission cooling and shifting performance.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission overheating or reduced performance
- Harsh or delayed shifts
- Transmission enters limp mode
2. Most Common Causes
- Internal failure of the auxiliary pump control module temperature sensor
- Short to ground or voltage in the sensor wiring
- High resistance or open circuit in the control module harness
- Defective auxiliary transmission fluid pump control module
- Corroded or loose electrical connections at the pump module
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Inspect the auxiliary pump control module connector for corrosion, damage, or loose pins.
Step 3: Using a multimeter, check the temperature sensor circuit resistance and compare to manufacturer specifications.
Step 4: If sensor readings are out of range, replace the auxiliary transmission fluid pump control module.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may overheat or shift poorly, leading to internal damage. Limp mode may limit speed and gear selection.
How much does it cost to fix?▼
The cost typically ranges from $200 to $600, including parts (control module) and labor. Diagnostic fees may add $100-$150.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.