U05BFInvalid Data Received From Trailer Backup Assist Control Module
- Generic OBD-II code · Network
- How the car detects it
- Trailer backup assist lets the driver reverse a trailer by turning a knob rather than the wheel; the vehicle measures the hitch angle and steers for the chosen path. Ford's Pro Trailer Backup Assist reads the angle from a target sticker via the rear camera or from a sensor on the trailer, and a Ford patent caps the steering command according to how fast the hitch angle changes, so the rig does not jackknife. Ram calls its version trailer reverse steering. On the 2021 Ram 1500 the lost-communication partner U02BE turned up in the ABS, steering and engine controllers with a throttle control message and the MIL, caused by internal module software; pulling fuse 53 restarted the module (STAR S2108000067). No maker documents U05BF; it means the module talks but sends invalid data, and the assist is then blocked.
- What you may notice
- Trailer backup assist cannot be activated or cancels
- Rear park assist temporarily unavailable
- Warning messages in other modules, on some trucks with MIL
- Likely causes
- LikelyInternal software fault in the trailer backup assist module
- PossibleImplausible hitch angle input from trailer target, camera or trailer sensor
- PossibleTrailer profile incomplete or measured dimensions wrong
- RareModule supply interrupted or connector loose
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.