Motor Electronics Coolant Pump Control Circuit High
The P0A07 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the control circuit of the motor electronics coolant pump. This pump is responsible for circulating coolant through the inverter and motor electronics in hybrid/electric vehicles. A high circuit voltage typically points to a short to battery voltage, a faulty pump motor, or a PCM issue. If left unresolved, it can lead to overheating of the motor electronics, reduced performance, or potential damage to the hybrid system.
01. Most Common Causes
- Short to battery voltage in the pump control circuit
- Faulty motor electronics coolant pump
- Damaged wiring or connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Overheating of motor electronics or inverter
- Reduced hybrid system performance
- Coolant pump not running or running continuously
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check for related codes.
Step 2: Visually inspect the coolant pump wiring and connector for damage or corrosion.
Step 3: Measure voltage at the pump control circuit; compare to manufacturer specs.
Step 4: Test the pump motor resistance and operation; replace if out of spec.
Step 5: If wiring and pump are good, suspect PCM fault and perform further diagnostics.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a high control circuit voltage can cause the pump to fail, leading to overheating of the motor electronics and potential damage to the hybrid system.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. The pump itself costs $50-$150, and labor adds $100-$250 depending on vehicle accessibility.