P0A06Motor Electronics Coolant Pump A Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The control line of pump A in the drive electronics coolant loop sits at a voltage below what the module expects for the commanded state, usually because the line or the pump input is shorted to ground. Depending on the driver design, the pump then runs uncontrolled or not at all. No manufacturer documents P0A06 publicly; GM's Volt reports a short of the comparable pump control line under P0CE9 (16 of 20 samples at 250 ms, Type B). CARB requires circuit checks of inverter cooling outputs, and Toyota patents show why a failed pump must be separated from radiator or fan faults. P0A05 is the open case, P0A07 the short to voltage. A failing pump soon leads to power reduction.
- What you may notice
- Hybrid system or check engine light
- Electronics temperature rising quickly, power limited
- Pump silent when commanded on, or running continuously
- Likely causes
- LikelyControl wire chafed against the body and shorted to ground
- PossibleInternal short at the pump's control input
- PossibleWater or coolant in the pump connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.