Error code
OBD2 U0031
OBD2U0031
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Vehicle Communication Bus A (Low).
Severity
highDriving may be possible but could lead to further damage and safety issues.
Summary
U0031 indicates that there is an issue with the Vehicle Communication Bus A, specifically a low voltage condition on the data bus.
Common Causes
- Low voltage in the VAN data bus A (+) circuit
- Faulty connectors or wiring related to the VAN data bus A
Fixes
FAQ
What should I do if my car shows U0031?
You may need to check the wiring and connectors related to the VAN data bus A for any signs of damage or corrosion. It's recommended to 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)