P0EEFDrive Motor A Control Module Overtemperature
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0EEF reports that the control module of drive motor A, the inverter electronics that switch the motor phases, has run too hot. The temperature reading itself is considered valid; faults of the inverter temperature sensors, such as P0AEF, are separate codes. No manufacturer documents P0EEF publicly. GM gives an idea of the limits on the 2016 Volt: its motor control processor A sets P0C11, P0C12 or P0C13 when power inverter phase U, V or W stays above 126 °C for 1.2 s within a 2 s window, rated Type A with the MIL after one trip. CARB demands that hybrid systems monitor electric motor performance. Low coolant in the electronics loop, a weak coolant pump, trapped air or long heavy load in hot weather heat the module, which then reduces motor torque to protect itself.
- What you may notice
- Reduced drive power or hybrid system warning
- MIL on (manufacturer-dependent)
- Electric drive switched off until the module cools
- Likely causes
- LikelyLow coolant level or air in the power electronics cooling loop
- PossibleElectronics coolant pump weak or failed
- PossibleLong full-load operation such as towing or climbing in high ambient heat
- RareDegraded power semiconductors or thermal interface inside the module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.