P0A07Motor Electronics Coolant Pump A Control Circuit High
- 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 module measures a voltage on the pump A control line that is higher than the commanded state allows, typically because the line touches a supply wire or the pump input has failed internally. The pump in the inverter and motor cooling loop may then be stuck on or never receive a valid command. No manufacturer documents P0A07 publicly. GM's Volt flags a short to voltage on its equivalent pump line as P0CE9, with 16 failures in 20 samples at 250 ms and a two-trip MIL. CARB requires inverter cooling outputs to be monitored for such circuit faults; Toyota patents describe pump speed and coolant flow checks for the same loop. P0A05 and P0A06 cover open and short to ground.
- What you may notice
- Hybrid system or check engine light
- Pump running all the time, even with the vehicle off
- Possible power limitation if cooling cannot be confirmed
- Likely causes
- LikelyControl wire shorted to a battery or ignition supply wire
- PossiblePump control electronics failed, pulling the input high
- RareOutput driver in the control module damaged
- 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.