Error code
OBD2 U0034
OBD2U0034
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Vehicle Communication Bus A (Low).
Severity
highYou may be able to drive, but communication issues can cause other problems.
Summary
U0034 indicates that the Vehicle Area Network (VAN) data bus A has low voltage, which can affect communication between different parts of your vehicle's electronic systems.
Common Causes
- Loose or damaged wiring in VAN data bus A
- Faulty power distribution module
Fixes
FAQ
What should I do if my car shows U0034?
Check for loose or damaged wiring in the VAN data bus A and inspect the power distribution module. If issues persist, consult a professional mechanic.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus (Performance)
- U0003High Speed CAN Communication Bus (Open)
- U0004High Speed CAN Communication Bus (Low)
- U0005High Speed CAN Communication Bus (High)
- U0006High Speed CAN Communication Bus (Open)
- U0007High Speed CAN Communication Bus (Low)
- U0008High Speed CAN Communication Bus (High)
- U0009High Speed CAN Communication Bus (shorted to Bus)
- U0010Medium Speed CAN Communication Bus
- U0011Medium Speed CAN Communication Bus (Performance)
- U0012Medium Speed CAN Communication Bus (Open)