OBD-II code · Network
U0014 Medium Speed CAN Communication Bus (-) High
CAN-Low on the medium-speed bus is shorted to battery voltage. The differential bus cannot work, body and comfort modules drop out of the network.
Is it safe to drive with U0014?
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 battery
- 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
- 0.8–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Can Low Wire, Module Connector
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.