Network
generic / SAE
U0042
Vehicle Communication Bus D (+) Open
The plus line of vehicle bus D is open. The fault is reported by the gateway when traffic from this segment disappears.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number– / 42
Possible causes
- Bus-D high wire broken 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: 80–700 €
- Estimated time: 1–5 h
- Component: can high wire
- Component: gateway module
- MIL / check engine light
Sources
References
sae:J2012
iso:11898