Network
generic / SAE
U064D
Lost Communication With Trailer Brake Control Switch
The vehicle bus reports loss of communication with smart trailer brake control switch. The driver-adjustable trailer brake gain input is unavailable; trailer braking falls back to default behaviour.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number6 / 4D
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: easy
- DIY: possible
- Estimated cost: 60–300 €
- Estimated time: 0.5–1.5 h
- Component: trailer brake control switch
- Component: vehicle bus wiring
- MIL / check engine light
- drive cycle required
Sources
References
sae:J2012