High Speed CAN Communication Bus (+) Open
The CAN-High line of the high-speed bus is open. Without the differential pair, the controller cannot decode any traffic and reports loss of all participating modules at once. Often follows a wiring repair, accident damage, or a corroded connector pin.
Affected components
- Can high wire
- Module connector
- Can transceiver
Common causes
- High likelihood: CAN-High wire broken or pin pushed back
- Medium likelihood: Corroded module connector
- Medium likelihood: Harness damage after repair or accident
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.