Network
generic / SAE
U0002
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.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number– / 02
Possible causes
- Corrosion or poor contact in CAN connectors high
- Electromagnetic interference (aftermarket electronics) medium
- One module sending malformed frames medium
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 80–1200 €
- Estimated time: 1–6 h
- Component: can bus wiring
- Component: control module
- MIL / check engine light
Sources
References
sae:J2012
iso:11898