U0106
NetworkModule Communicationhigh severityLost Communication with Glow Plug Control Module
What U0106 Means
Cannot communicate with the glow plug control module on diesel vehicles.
Symptoms
- Hard cold starting
- Glow plug light stays on
- Extended cranking
- White exhaust smoke on cold start
Common Causes
- Glow plug module failure
- CAN bus wiring issue
- Fuse blown
- Module connector corrosion
- Glow plug module water damage
Diagnostic Steps
- Check glow plug module fuse
- Test module power and ground
- Inspect module connector
- Check CAN bus wiring
- Test glow plug module directly
Where to start: Check fuses and power supply. Glow plug modules often fail from heat exposure.
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