U0122 — Lost Communication with Vehicle Dynamics Control Module
Seen on: Heavy Truck
Lost Communication with Vehicle Dynamics Control Module. Common causes: VDC/stability module offline.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- VDC/stability module offline
- Module power fault
- CAN wiring
First moves (roadside)
- Check VDC module power and CAN connections
FAQ
Lost Communication with Vehicle Dynamics Control Module. Common causes: VDC/stability module offline.
Caution — Limp to the next safe stop.
The most common cause is: VDC/stability module offline. Other possibilities include Module power fault; CAN wiring.
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.