U0122
Lost Communication With Vehicle Dynamics Control Module
Communication network (stability control)
Generic OBD-II
Medium
What it means
U0122 means the network has lost communication with the vehicle dynamics (stability control) module, which manages ESP/ESC and traction control. With the module offline those systems shut down and their warning lights come on. The car still drives, steers, and brakes, but you lose the electronic help that keeps it stable in hard cornering or on slippery roads, so it's worth fixing promptly.
Medium
Can I keep driving? The car drives and brakes normally, but stability and traction control are disabled — drive gently, especially in the wet or snow, until it's fixed.
Common symptoms
What you'll notice
- Stability control (ESP/ESC), traction, and often ABS warning lights on
- Stability and traction control disabled
- Vehicle dynamics/stability module missing when scanned
- Related chassis U-codes stored alongside it
Common causes
Most likely first
- Open, shorted, or chafed CAN wiring to the vehicle dynamics moduleLikely
- Corroded or loose connector at the moduleCommon
- Blown fuse or lost power/ground to the moduleCommon
- Failed vehicle dynamics control moduleLess often
- Bus fault preventing the module from reportingLess often
How to diagnose & fix
Work through it in order
- Scan all modules and confirm the vehicle dynamics module is offline.
- Check its power, ground, and fuse feeds.
- Inspect wiring and the connector at the module for damage or corrosion.
- Test the CAN bus lines to the module for open or short.
- If wiring and power check out, replace the module, clear the code, and confirm stability control returns.
FAQ
Quick answers
Is it safe to drive with U0122?+
The brakes and steering still work, but stability and traction control are off, so the car is more likely to slip in hard cornering or on slick roads. Drive cautiously and get it fixed soon.
Can I just clear U0122?+
It comes back while the module stays offline. The underlying wiring, power, or module fault has to be repaired.
Related codes
Often seen with U0122
Read & clear U0122 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX