Error code
OBD2 U0009
OBD2U0009
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
High Speed CAN Communication Bus (shorted to Bus).
Severity
severeDriving may be unsafe due to potential electrical issues and system failures.
Summary
U0009 indicates a short circuit in the high-speed Controller Area Network (CAN) data bus, specifically where the negative (-) line is shorted to the positive (+) line.
Common Causes
- Short circuit between CAN bus lines
- Faulty wiring or connectors on the CAN bus
Fixes
FAQ
What does U0009 mean?
U0009 indicates a short circuit in the high-speed CAN data bus, specifically where the negative (-) line is shorted to the positive (+) line.
How do I fix U0009?
Fixing U0009 typically involves identifying and repairing the faulty wiring or connectors on the CAN bus. This may require professional diagnosis and repair.
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)
- U0010Medium Speed CAN Communication Bus
- U0011Medium Speed CAN Communication Bus (Performance)
- U0012Medium Speed CAN Communication Bus (Open)
- U0013Medium Speed CAN Communication Bus (Low)