Network
generic / SAE
U0024
Low Speed CAN Communication Bus Off
The low-speed CAN controller has gone bus-off after repeated error frames. The fault-tolerant single-wire fallback is exhausted and the bus stops carrying traffic.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number– / 24
Possible causes
- Wiring short keeps bus in bus-off high
- One failing node spamming errors 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: low speed can wiring
- Component: body control module
- MIL / check engine light
Sources
References
sae:J2012
iso:11898