Network
generic / SAE
U007C
Control Module Communication Bus J Off
The control module communication bus J is off — the gateway has shut down or isolated this bus, often due to repeated bus errors or a "bus off" event in the CAN controller.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number– / 7C
Possible causes
- CAN controller in bus-off state 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: 120–1500 €
- Estimated time: 1–6 h
- Component: bus j gateway
- Component: bus j wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012