OBD-II code · Network
U0106 Lost Communication with Glow Plug Control Module
The Glow Plug Control Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Cold-start pre-heating is no longer coordinated, causing hard diesel starts. 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 U0106?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyGlow plug module unpowered
- PossibleCAN wiring to glow plug 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
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Glow Plug Control Module, Can Bus Wiring
Related codes
- U0103Lost Communication with Gear Shift Module
- U0104Lost Communication with Cruise Control Module
- U0105Lost Communication with Fuel Injector Control Module
- U0107Lost Communication with Throttle Actuator Control Module
- U0108Lost Communication With Alternative Fuel Control Module
- U0109Lost Communication with Fuel Pump Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.