OBD-II code · Network
U0055 Vehicle Communication Bus D
Generic fault on bus D (fourth bus, often dedicated subsystem like infotainment or driver assistance).
Is it safe to drive with U0055?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWiring or node fault on bus D
- 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
- 1–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Bus D Wiring, Bus D Nodes
Related codes
- U0028Vehicle Communication Bus A
- U0029Vehicle Communication Bus B
- U0037Vehicle Communication Bus B
- U0046Vehicle Communication Bus C
- U0064Vehicle Communication Bus E
- U0089Vehicle Communication Bus G
- U009BVehicle Communication Bus I
- U009DVehicle Communication Bus J
- U0052Vehicle Communication Bus C (-) Low
- U0053Vehicle Communication Bus C (-) High
- U0054Vehicle Communication Bus C (-) shorted to Bus C (+)
- U0056Vehicle Communication Bus D Performance
- U0057Vehicle Communication Bus D (+) Open
- U0058Vehicle Communication Bus D (+) Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.