U CODE FAMILY

Network code references.

Communication and network diagnostic references. A communication code does not identify a failed module by itself.

Generic OBD-II

U0001

These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.

High Speed CAN Communication Bus

High Speed CAN Communication Bus Performance

High Speed CAN Communication Bus (+) Open

High Speed CAN Communication Bus (+) Low

High Speed CAN Communication Bus (+) High

High Speed CAN Communication Bus (-) Open

High Speed CAN Communication Bus (-) Low

High Speed CAN Communication Bus (-) High

High Speed CAN Communication Bus (-) shorted to Bus (+)

Medium Speed CAN Communication Bus

Medium Speed CAN Communication Bus Performance

Medium Speed CAN Communication Bus (+) Open

Medium Speed CAN Communication Bus (+) Low

Medium Speed CAN Communication Bus (+) High

Medium Speed CAN Communication Bus (-) Open

Medium Speed CAN Communication Bus (-) Low

Medium Speed CAN Communication Bus (-) High

Medium Speed CAN Communication Bus (-) shorted to Bus (+)

Low Speed CAN Communication Bus

Low Speed CAN Communication Bus Performance

Low Speed CAN Communication Bus (+) Open

Low Speed CAN Communication Bus (+) Low

Low Speed CAN Communication Bus (+) High

Low Speed CAN Communication Bus (-) Open

Low Speed CAN Communication Bus (-) Low

Low Speed CAN Communication Bus (-) High

Low Speed CAN Communication Bus (-) shorted to Bus (+)

Vehicle Communication Bus A

Vehicle Communication Bus A Performance

Vehicle Communication Bus A (+) Open

Vehicle Communication Bus A (+) Low

Vehicle Communication Bus A (+) High

Vehicle Communication Bus A (-) Open

Vehicle Communication Bus A (-) Low

Vehicle Communication Bus A (-) High

Vehicle Communication Bus A (-) shorted to Bus A (+)

Vehicle Communication Bus B

Vehicle Communication Bus B Performance

Vehicle Communication Bus B (+) Open

Vehicle Communication Bus B (+) Low

Vehicle Communication Bus B (+) High

Vehicle Communication Bus B (-) Open

Vehicle Communication Bus B (-) Low

Vehicle Communication Bus B (-) High

Vehicle Communication Bus B (-) shorted to Bus B (+)

Vehicle Communication Bus C

Vehicle Communication Bus C Performance

Vehicle Communication Bus C (+) Open

Vehicle Communication Bus C (+) Low

Vehicle Communication Bus C (+) High

Vehicle Communication Bus C (-) Open

Vehicle Communication Bus C (-) Low

Vehicle Communication Bus C (-) High

Vehicle Communication Bus C (-) shorted to Bus C (+)

Vehicle Communication Bus D

Vehicle Communication Bus D Performance

Vehicle Communication Bus D (+) Open

Vehicle Communication Bus D (+) Low

Vehicle Communication Bus D (+) High

Vehicle Communication Bus D (-) Open

Vehicle Communication Bus D (-) Low

Vehicle Communication Bus D (-) High

Vehicle Communication Bus D (-) shorted to Bus D (+)

Vehicle Communication Bus E

Vehicle Communication Bus E Performance

Vehicle Communication Bus E (+) Open

Vehicle Communication Bus E (+) Low

Vehicle Communication Bus E (+) High

Vehicle Communication Bus E (-) Open

Vehicle Communication Bus E (-) Low

Vehicle Communication Bus E (-) High

Vehicle Communication Bus E (-) shorted to Bus E (+)

Control Module Communication Bus A Off

Control Module Communication Bus B Off

Control Module Communication Bus C Off

Control Module Communication Bus D Off

Control Module Communication Bus E Off

Control Module Communication Bus F Off

Control Module Communication Bus G Off

Control Module Communication Bus H Off