U01BELost Communication With Drive Motor A Clutch Actuator
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Some electrified drivetrains can uncouple a drive motor from its wheels so that an idle motor is not spun by the road. The Chevrolet Corvette E-Ray has such a disconnect: GM bulletin 24-NA-273 (January 2025, 2024–2025 models with LT2 engine) ties U01BE with a lit MIL to an internal microchip fault in the M162 drive motor disconnect clutch actuator, and the remedy is a new actuator. A Rivian patent shows why the actuator matters: before engagement the motor speed is matched to the output speed, and the control system judges from the motor's reaction whether the clutch has engaged. With the actuator silent, the system can neither couple the motor nor confirm its state, so electric drive on that axle is lost. U04BF covers invalid data from the actuator.
- What you may notice
- MIL on
- Electric drive on one axle or all-wheel drive unavailable
- Reduced acceleration
- Likely causes
- LikelyInternal electronic fault in the clutch actuator (GM M162 replaced)
- PossibleConnector or wiring fault at the actuator on the drive unit
- RareActuator without supply voltage or ground
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.