OBD-II code · Network
U0122 Lost Communication with Vehicle Dynamics Control Module
The Vehicle Dynamics Control Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Stability control (ESC/ESP) is disabled, leaving the car without electronic stabilisation. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
Is it safe to drive with U0122?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyVehicle dynamics module unpowered
- PossibleCAN wiring to dynamics module broken
- Less likelyGateway module routing CAN messages incorrectly
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
- 1–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Vehicle Dynamics Module, Can Bus Wiring
Related codes
- U011FLost Communication With V2X Module
- U0120Lost Communication with Starter/Generator Control Module
- U0121Lost Communication with ABS Control Module
- U0123Lost Communication with Yaw Rate Sensor Module
- U0124Lost Communication with Lateral Acceleration Sensor Module
- U0125Lost Communication with Multi-axis Acceleration Sensor
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.