Motor Electronics Coolant Pump Control Circuit Low
The P0A06 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the control circuit of the motor electronics coolant pump. This pump is responsible for circulating coolant through the inverter and electric motor assembly in hybrid/electric vehicles. A low circuit voltage typically points to a faulty pump, wiring issues, or a failed control module. If left unaddressed, the electric drive components can overheat, leading to reduced performance or damage.
01. Most Common Causes
- Faulty motor electronics coolant pump
- Open or shorted wiring in the pump control circuit
- Poor electrical connection at the pump or PCM
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Overheating of electric drive components
- Reduced hybrid system performance or limp mode
- Coolant pump not running or running intermittently
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Visually inspect the coolant pump connector and wiring for damage or corrosion.
Step 3: Test the pump control circuit voltage with a multimeter (should be near battery voltage with key on).
Step 4: Check pump resistance and operation by applying direct battery power (if safe).
Step 5: If pump and wiring are good, test PCM output or replace PCM as last resort.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a low circuit voltage can cause the coolant pump to fail, leading to overheating of the electric motor and inverter, which may result in costly damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but can be higher if the pump or PCM needs replacement.