OBD-II code · Network
U0408 Invalid Data Received from Vehicle Immobilizer Control Module
The ECU receives an authorisation message from the immobilizer that does not match the expected rolling code. Engine start is blocked.
Is it safe to drive with U0408?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyKey not properly learned
- PossibleSoftware version mismatch
- 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
- 0.3–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Immobilizer Module, Ecm
Related codes
- U0425Invalid Data Received from Vehicle Immobilizer Control Module
- U0405Invalid Data Received from Cruise Control Module
- U0406Invalid Data Received from Cruise Control Front Distance Range Sensor
- U0407Invalid Data Received from Steering Angle Sensor Module
- U0409Invalid Data Received from Vehicle Security Control Module
- U040AInvalid Data Received From Air Conditioning Control Module
- U040BInvalid Data Received From Exhaust Gas Recirculation Control Module A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.