High Speed CAN Communication Bus
A general fault on the high-speed CAN bus has been detected. This bus typically connects powertrain modules (ECM, TCM, ABS) at 500 kbit/s and a fault disables communication between them, often triggering multiple secondary DTCs in other modules.
Affected components
- Can bus wiring
- Can terminating resistor
- Control module
Common causes
- High likelihood: CAN-High and CAN-Low shorted together
- High likelihood: Open circuit in CAN bus wiring
- Medium likelihood: Terminating resistor failed (not 60 ohms across bus)
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.