Code result
U0139
Lost Communication with Active Roll Control Module
Moderate severity
What it means
The active anti-roll bar / dynamic chassis controller has dropped off the bus. The vehicle behaves as if the system is disabled; rolling motion is not actively counteracted.
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
Active roll module unpowered
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
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose U0139 freeNo credit card required