Network
generic / SAE
U0400
Invalid Data Received
A controller flags that the data received over the bus is implausible without identifying a specific source. Used as a generic placeholder when the more specific U04xx codes do not apply.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number4 / 00
Possible causes
- Marginal signal on bus 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: 80–600 €
- Estimated time: 0.5–4 h
- Component: can bus wiring
- Component: control module
- MIL / check engine light
Sources
References
sae:J2012
iso:11898