Network
generic / SAE
U02BE
Lost Communication With Trailer Backup Assist Control Module
The vehicle bus reports loss of communication with the trailer backup assist module. Steer-by-knob trailer reverse guidance, hitch angle sensing and trajectory planning are unavailable.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number2 / BE
Possible causes
- Bus wiring open or shorted high
- Module without power or ground medium
- Module failed medium
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 0.5–3 h
- Component: trailer backup assist module
- Component: vehicle bus wiring
- drive cycle required
Sources
References
sae:J2012