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.
High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.
Symptoms
- Reduced drive power or hybrid system warning
- MIL on (manufacturer-dependent)
- Electric drive switched off until the module cools
Most likely causes
- Low coolant level or air in the power electronics cooling loop
- Electronics coolant pump weak or failed
- Long full-load operation such as towing or climbing in high ambient heat
- Degraded power semiconductors or thermal interface inside the module
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P0EEF means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- E: Subsystem depends on the code range
- EF: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0EEF?
If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.
What causes code P0EEF?
The most common causes are: low coolant level or air in the power electronics cooling loop; electronics coolant pump weak or failed; long full-load operation such as towing or climbing in high ambient heat.
Related codes
- P0C11Drive Motor A Inverter Phase U Over Temperature
- P0C12Drive Motor A Inverter Phase V Over Temperature
- P0C13Drive Motor A Inverter Phase W Over Temperature
- P0A78Drive Motor A Inverter Performance
- P0A1BDrive Motor A Control Module Performance
- P0AEFDrive Motor Inverter Temperature Sensor A Circuit Low
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.