Error code
OBD2 U0023
OBD2U0023
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Low Speed CAN Communication Bus (High).
Severity
highDriving may be possible but could lead to further issues. It's best to address this soon.
Summary
U0023 indicates an issue with the Low Speed CAN Communication Bus, specifically that the voltage is too high on the positive side of this bus. This affects communication between vehicle modules.
Common Causes
- Faulty wiring or connector in the low-speed CAN network
- Malfunctioning module connected to the low-speed CAN
Fixes
FAQ
What does U0023 mean?
U0023 indicates a high voltage issue on the low-speed CAN bus, which can disrupt communication between vehicle modules.
How do I fix U0023?
Fixing U0023 typically involves diagnosing and repairing faulty wiring or connectors in the low-speed CAN network. It may also involve replacing a malfunctioning module connected to this bus.
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)