OBD-II code · Network
U0168 Lost Communication with Vehicle Immobilizer Control Module
The ECU cannot reach the immobilizer / vehicle security module. Engine start is usually blocked because the rolling code cannot be exchanged.
Is it safe to drive with U0168?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyImmobilizer module unpowered
- PossibleWiring or antenna ring damaged
- 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
- 0.5–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Immobilizer Module, Can Bus Wiring
Related codes
- U0165Lost Communication with Auxiliary HVAC Control Module
- U0166Lost Communication with Auxiliary Heater Control Module
- U0167Lost Communication with Vehicle Immobiliser Control Module
- U0169Lost Communication with Sun Roof Control Module
- U016ALost Communication With Global Positioning System Module
- U016BLost Communication With A/C Compressor Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.