U04BFInvalid Data Received From Drive Motor A Clutch Actuator
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- Some electric and hybrid drivetrains can separate a drive motor from its wheels with a clutch so that an unused axle does not drag the motor along. A Rivian patent describes such a disconnect without a position sensor: the motor speed is brought within a small window of the output speed before engaging, and the control system judges success from how the motor responds to the load. U04BF is set when the actuator for drive motor A sends messages that the receiving controller finds implausible, for example a clutch state that contradicts the speeds. No manufacturer documents this code publicly. On hybrids CARB 1968.2 calls for monitoring of drive motor performance. U01BE marks a silent actuator. Expect reduced power, all-wheel drive or the second motor locked out, and a drive system warning.
- What you may notice
- Drive system or all-wheel-drive warning
- Reduced power or one motor not used
- Clunk or jerk when the motor is coupled
- Likely causes
- PossibleClutch actuator motor or its electronics faulty
- PossibleWorn or sticking disconnect clutch giving a state that does not match the command
- PossibleBus wiring or connector at the drive unit damaged
- RareSoftware of actuator and drive controller not matching
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.