U0042 — Vehicle Communication Bus B (–) Open
Severity: Serious
Can you drive? With caution: limp mode possible, have it checked soon
Make: All makes (OBD-II standard)
| Meaning | Vehicle Communication Bus B (–) Open. |
| Family | Network (U) |
Frequently asked questions
What does code U0042 mean?
Vehicle Communication Bus B (–) Open. Vehicle Communication Bus B (–) Open.
Can I keep driving with code U0042 active?
With caution: limp mode possible, have it checked soon
How do you fix code U0042?
Diagnosis starts from reading the live ECU parameters: the code points to the fault area, not to the part to replace. A vehicle-electronics specialist can test the component and clear the code after the repair.
Need help with this fault?
We are ECU specialists: diagnosis, file repair and remapping for cars, bikes, trucks and agricultural vehicles.
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Where to get it fixed
Related codes
- U0001 — High Speed CAN Communication Bus
- U0002 — High Speed CAN Communication Bus Performance
- U0003 — High Speed CAN Communication Bus (+) Open
- U0004 — High Speed CAN Communication Bus (+) Low
- U0005 — High Speed CAN Communication Bus (+) High
- U0006 — High Speed CAN Communication Bus (–) Open
- U0007 — High Speed CAN Communication Bus (–) Low
- U0008 — High Speed CAN Communication Bus (–) High
- U0009 — High Speed CAN Communication Bus (–) shorted to Bus (+)
- U0010 — Medium Speed CAN Communication Bus
- U0011 — Medium Speed CAN Communication Bus Performance
- U0012 — Medium Speed CAN Communication Bus (+) Open