Network
generic or reserved
U3035
Communication Authentication Signal Invalid Data
The received authentication signal contains invalid data — message authentication code does not match expected value, suggesting tampering or corruption.
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number– / 35
Possible causes
- Authentication code mismatch high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec 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: 100–1500 €
- Estimated time: 1–5 h
- Component: can bus
- Component: security module
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012