OBD-II code · Network
U0026 Low Speed CAN Communication Bus (-) Low
CAN-Low on the low-speed bus is shorted to ground. Differential signaling is no longer reliable, modules drop offline.
Is it safe to drive with U0026?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyCAN-Low shorted to ground
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
- 0.8–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Low Speed Can Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.