Error code
OBD2 U0003
OBD2U0003
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
High Speed CAN Communication Bus (Open).
Severity
severeDriving may be possible but is not recommended due to potential safety risks.
Summary
U0003 indicates an open circuit in the high-speed Controller Area Network (CAN) data bus, which is a critical communication network for vehicle systems.
Common Causes
- Open circuit in the high-speed CAN data bus cable or connector
- Faulty module connected to the high-speed CAN
Fixes
FAQ
What does U0003 mean?
U0003 indicates an issue with the high-speed CAN data bus, specifically an open circuit.
How serious is this code?
This code is severe because it affects critical communication between vehicle systems and can lead to safety issues if not addressed.
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)
- 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)
- U0013Medium Speed CAN Communication Bus (Low)