Vehicle Communication Bus A (-) shorted to Bus A (+)
The two lines of differential bus A are shorted together. Communication impossible — both lines see the same voltage.
Affected components
- Bus a wiring
Common causes
- High likelihood: CAN-H/CAN-L shorted together
- 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.