High Speed CAN Communication Bus (+) High
The CAN-High line is held above its valid voltage range, usually because of a short to battery voltage. Bus communication collapses for every connected module.
Affected components
- Can high wire
- Module connector
Common causes
- High likelihood: CAN-High shorted to battery voltage
- Medium likelihood: Chafed harness against power wire
- Low likelihood: Gateway module routing CAN messages incorrectly
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
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.