OBD-II code · Network
U0307 Software Incompatibility with Glow Plug Control Module
The glow plug controller and the engine ECU run incompatible software versions. Cold-start preheating may be inhibited and the glow plug warning lamp can stay on.
Is it safe to drive with U0307?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySoftware flash mismatch after parts swap
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
- 0.5–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Glow Plug Module, Ecm
Related codes
- U0304Invalid Data Received from Transmission Control Module
- U0305Software Incompatibility with Cruise Control Module
- U0306Software Incompatibility with Fuel Injector Control Module
- U0308Software Incompatibility with Body Control Module
- U0309Software Incompatibility With Alternative Fuel Control Module
- U030ASoftware Incompatibility With Evaporative Emission System Leak Detection Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.