ABS for trailer
â–¶ How to fix
Try uncoupling the trailer to see whether the fault code is still active. If it is, make sure the circuit from the coordinator is not shorting to earth or open.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The voltage in the circuit for the trailer ABS control unit has been either too high or too low.
Possible cause
Short circuit or open circuit in trailer ABS control unit. There may also be a problem with the trailer contact or an internal fault in the trailer ABS control unit.