Auxiliary Transmission Fluid Pump Control Module Feedback Signal Low
The P0C2D code indicates that the auxiliary transmission fluid pump control module is reporting a low voltage or signal level on its feedback circuit. This pump is used in hybrid and electric vehicles to circulate transmission fluid when the main engine is off. A low feedback signal suggests a wiring issue, faulty pump module, or low battery voltage affecting the circuit.
01. Most Common Causes
- Faulty auxiliary transmission fluid pump control module
- Open or shorted wiring in the feedback circuit
- Poor electrical connection at the pump module connector
- Low system voltage (battery or charging issue)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission may not shift properly or go into limp mode
- Reduced fuel economy or hybrid system warning
- Transmission fluid overheating
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Inspect the auxiliary pump connector for corrosion, damage, or loose pins.
Step 3: Measure voltage and ground at the pump module connector with a multimeter.
Step 4: Test the feedback signal wire for continuity and shorts to ground or power.
Step 5: If wiring is OK, 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. The auxiliary pump is critical for transmission cooling and lubrication when the engine is off. Driving could cause transmission damage or overheating.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. The control module itself is often $100-$250, plus diagnostic time.