Network
generic / SAE
U0028
Vehicle Communication Bus A
Generic fault on vehicle communication bus A. The controller flags an unspecified electrical or protocol fault on this bus segment that does not match the more specific U0xxx subcodes.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number– / 28
Possible causes
- Intermittent CAN wiring fault high
- Marginal node corrupting traffic 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: 80–700 €
- Estimated time: 1–5 h
- Component: can bus wiring
- Component: control module
- MIL / check engine light
Sources
References
sae:J2012
iso:11898