Code result
U0137
Lost Communication with Trailer Brake Control Module
Moderate severity
What it means
The vehicle network has lost the integrated trailer brake controller. Trailer braking falls back to passive operation; trailer-related warnings appear in the cluster.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Trailer module unpowered or fuse blown
highOne of the most commonly reported causes for this code — check this first.
Gateway module routing CAN messages incorrectly
lowLess common, but worth ruling out after the more likely causes.
CAN terminating resistor (120 Ω) drifted out of spec
lowLess common, but worth ruling out after the more likely causes.
Related help
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