OBD-II code · Network
U0139 Lost Communication with Active Roll Control Module
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 with U0139?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyActive roll module unpowered
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Active Roll Module, Can Bus Wiring
Related codes
- U0136Lost Communication with Park Brake Module B
- U0137Lost Communication with Trailer Brake Control Module
- U0138Lost Communication with All Terrain Control Module
- U013CLost Communication With Accelerator Pedal Module
- U013DLost Communication With Vacuum Sensor A
- U013ELost Communication With Vacuum Sensor B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.