Network
generic / SAE
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.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number1 / 68
Possible causes
- Immobilizer module unpowered high
- Wiring or antenna ring damaged medium
- Gateway module routing CAN messages incorrectly low
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 80–900 €
- Estimated time: 0.5–4 h
- Component: immobilizer module
- Component: can bus wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012