Vehicle Communication Bus B Off
A controller on bus B has reached its transmit error limit and shut its transceiver off. All traffic on this segment stops until the cause is removed.
Affected components
- Can transceiver
- Can bus wiring
Common causes
- High likelihood: Persistent wiring 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
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.