Network
generic / SAE
U0011
Medium Speed CAN Communication Bus Performance
The medium-speed CAN bus is operating but with degraded performance — frame errors or excessive error counters. Comfort and infotainment functions may operate intermittently.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number– / 11
Possible causes
- Corrosion in body harness connectors high
- One module sending malformed frames medium
- Gateway module routing CAN messages incorrectly low
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: 80–1000 €
- Estimated time: 1–5 h
- Component: can bus wiring
- Component: body control module
Sources
References
sae:J2012
iso:11898