Network
generic / SAE
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.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number4 / 08
Possible causes
- Key not properly learned high
- Software version mismatch 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: 80–800 €
- Estimated time: 0.3–3 h
- Component: immobilizer module
- Component: ecm
- MIL / check engine light
Sources
References
sae:J2012