U01BE code meaning
Lost Communication With Drive Motor A Clutch Actuator
Network system Generic code U01xx codes Check engine light
What U01BE means
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.
U01BE at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U01BE
- MIL on
- Electric drive on one axle or all-wheel drive unavailable
- Reduced acceleration
Common causes of U01BE
- Most likelyInternal electronic fault in the clutch actuator (GM M162 replaced)
- PossibleConnector or wiring fault at the actuator on the drive unit
- Less likelyActuator without supply voltage or ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor a clutchCAN bus
What each part of U01BE means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| BE | The exact fault in that area. |
What to do next
- Note U01BE and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U01BE
What does U01BE mean?
U01BE means "Lost Communication With Drive Motor A Clutch Actuator". Some electrified drivetrains can uncouple a drive motor from its wheels so that an idle motor is not spun by the road. It is a generic code, so it means the same on every make.
Is it safe to drive with U01BE?
Drive gently and only to a workshop. With U01BE the car can go into limp mode (reduced power) to protect itself.
Will U01BE fail an emissions test?
Yes, it can. U01BE is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U01BE to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will U01BE clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.