High Speed CAN Communication Bus Performance
The high-speed CAN bus is functional but performance is degraded — frame errors, bit errors or excessive bus load have been detected. Communication may be intermittent rather than completely lost, leading to sporadic warning lamps.
Affected components
- Can bus wiring
- Control module
Common causes
- High likelihood: Corrosion or poor contact in CAN connectors
- Medium likelihood: Electromagnetic interference (aftermarket electronics)
- Medium likelihood: One module sending malformed frames
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.