Vehicle Communication Bus B
Generic fault on vehicle communication bus B (second physical bus, e.g. body CAN, comfort CAN, or LIN). One or more nodes cannot communicate.
Affected components
- Bus b wiring
- Bus b nodes
Common causes
- High likelihood: Wiring or node fault on bus B
- Low likelihood: Gateway module routing CAN messages incorrectly
- Low likelihood: CAN terminating resistor (120 Ω) drifted out of spec
Possible 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
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.