OBD-II code · Network
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.
Is it safe to drive with U0024?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyWiring short keeps bus in bus-off
- PossibleOne failing node spamming errors
- Less likelyGateway module routing CAN messages incorrectly
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Low Speed Can Wiring, Body Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.