OBD-II code · Network
U0306 Software Incompatibility with Fuel Injector Control Module
The injector driver module identifies itself with a software version that does not match what the engine ECU expects. Engine may not start or runs roughly until both modules are reflashed to compatible versions.
Is it safe to drive with U0306?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySoftware flash incomplete or wrong file
- 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
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Injector Driver Module, Ecm
Related codes
- U0303Software Incompatibility with Transfer Case Control Module
- U0304Invalid Data Received from Transmission Control Module
- U0305Software Incompatibility with Cruise Control Module
- U0307Software Incompatibility with Glow Plug Control Module
- U0308Software Incompatibility with Body Control Module
- U0309Software Incompatibility With Alternative Fuel Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.