U00xx codes: Network codes U0000-U0099
116 network trouble codes from U0001 to U009E. They mostly involve the module connector, CAN transceiver, CAN low wire and CAN high wire.
All U00xx codes
6 of these codes usually turn on the check engine light; 0 can often be fixed at home.
| Code | Meaning | Difficulty |
|---|---|---|
| U0001 | High Speed CAN Communication Bus | Hard |
| U0002 | High Speed CAN Communication Bus Performance | Hard |
| U0003 | High Speed CAN Communication Bus (+) Open | Hard |
| U0004 | High Speed CAN Communication Bus (+) Low | Hard |
| U0005 | High Speed CAN Communication Bus (+) High | Hard |
| U0006 | High Speed CAN Communication Bus (-) Open | Hard |
| U0007 | High Speed CAN Communication Bus (-) Low | Hard |
| U0008 | High Speed CAN Communication Bus (-) High | Hard |
| U0009 | High Speed CAN Communication Bus (-) Shorted to Bus (+) | Hard |
| U0010 | Medium Speed CAN Communication Bus | Hard |
| U0011 | Medium Speed CAN Communication Bus Performance | Medium |
| U0012 | Medium Speed CAN Communication Bus (+) Open | Medium |
| U0013 | Medium Speed CAN Communication Bus (+) Low | Medium |
| U0014 | Medium Speed CAN Communication Bus (+) High | Medium |
| U0015 | Medium Speed CAN Communication Bus (-) Open | Medium |
| U0016 | Medium Speed CAN Communication Bus (-) Low | Medium |
| U0017 | Medium Speed CAN Communication Bus (-) High | Medium |
| U0018 | Medium Speed CAN Communication Bus (-) Shorted to Bus (+) | Medium |
| U0019 | Low Speed CAN Communication Bus | Hard |
| U0020 | Low Speed CAN Communication Bus Performance | Medium |
| U0021 | Low Speed CAN Communication Bus (+) Open | Medium |
| U0022 | Low Speed CAN Communication Bus (+) Low | Medium |
| U0023 | Low Speed CAN Communication Bus (+) High | Medium |
| U0024 | Low Speed CAN Communication Bus (-) Open | Medium |
| U0025 | Low Speed CAN Communication Bus (-) Low | Medium |
| U0026 | Low Speed CAN Communication Bus (-) High | Medium |
| U0027 | Low Speed CAN Communication Bus (-) Shorted to Bus (+) | Medium |
| U0028 | Vehicle Communication Bus A | Hard |
| U0029 | Vehicle Communication Bus A Performance | Hard |
| U0030 | Vehicle Communication Bus A (+) Open | Hard |
| U0031 | Vehicle Communication Bus A (+) Low | Hard |
| U0032 | Vehicle Communication Bus A (+) High | Hard |
| U0033 | Vehicle Communication Bus A (-) Open | Hard |
| U0034 | Vehicle Communication Bus A (-) Low | Hard |
| U0035 | Vehicle Communication Bus A (-) High | Hard |
| U0036 | Vehicle Communication Bus A (-) Shorted to Bus A (+) | Hard |
| U0037 | Vehicle Communication Bus B | Hard |
| U0038 | Vehicle Communication Bus B Performance | Hard |
| U0039 | Vehicle Communication Bus B (+) Open | Hard |
| U0040 | Vehicle Communication Bus B (+) Low | Hard |
| U0041 | Vehicle Communication Bus B (+) High | Hard |
| U0042 | Vehicle Communication Bus B (-) Open | Hard |
| U0043 | Vehicle Communication Bus B (-) Low | Hard |
| U0044 | Vehicle Communication Bus B (-) High | Hard |
| U0045 | Vehicle Communication Bus B (-) Shorted to Bus B (+) | Hard |
| U0046 | Vehicle Communication Bus C | Hard |
| U0047 | Vehicle Communication Bus C Performance | Hard |
| U0048 | Vehicle Communication Bus C (+) Open | Hard |
| U0049 | Vehicle Communication Bus C (+) Low | Hard |
| U0050 | Vehicle Communication Bus C (+) High | Hard |
| U0051 | Vehicle Communication Bus C (-) Open | Hard |
| U0052 | Vehicle Communication Bus C (-) Low | Hard |
| U0053 | Vehicle Communication Bus C (-) High | Hard |
| U0054 | Vehicle Communication Bus C (-) Shorted to Bus C (+) | Hard |
| U0055 | Vehicle Communication Bus D | Hard |
| U0056 | Vehicle Communication Bus D Performance | Hard |
| U0057 | Vehicle Communication Bus D (+) Open | Hard |
| U0058 | Vehicle Communication Bus D (+) Low | Hard |
| U0059 | Vehicle Communication Bus D (+) High | Hard |
| U0060 | Vehicle Communication Bus D (-) Open | Hard |
| U0061 | Vehicle Communication Bus D (-) Low | Hard |
| U0062 | Vehicle Communication Bus D (-) High | Hard |
| U0063 | Vehicle Communication Bus D (-) Shorted to Bus D (+) | Hard |
| U0064 | Vehicle Communication Bus E | Hard |
| U0065 | Vehicle Communication Bus E Performance | Medium |
| U0066 | Vehicle Communication Bus E (+) Open | Hard |
| U0067 | Vehicle Communication Bus E (+) Low | Hard |
| U0068 | Vehicle Communication Bus E (+) High | Hard |
| U0069 | Vehicle Communication Bus E (-) Open | Hard |
| U0070 | Vehicle Communication Bus E (-) Low | Hard |
| U0071 | Vehicle Communication Bus E (-) High | Hard |
| U0072 | Vehicle Communication Bus E (-) Shorted to Bus E (+) | Hard |
| U0073 | Control Module Communication Bus A Off | Hard |
| U0074 | Control Module Communication Bus B Off | Hard |
| U0075 | Control Module Communication Bus C Off | Hard |
| U0076 | Control Module Communication Bus D Off | Medium |
| U0077 | Control Module Communication Bus E Off | Hard |
| U0078 | Control Module Communication Bus F Off | Medium |
| U0079 | Control Module Communication Bus G Off | Hard |
| U007A | Control Module Communication Bus H Off | Hard |
| U007B | Control Module Communication Bus I Off | Hard |
| U007C | Control Module Communication Bus J Off | Hard |
| U007D | Control Module Communication Bus K Off | Medium |
| U007E | Control Module Communication Bus L Off | Hard |
| U007F | Control Module Communication Bus M Off | Hard |
| U0080 | Vehicle Communication Bus F | Hard |
| U0081 | Vehicle Communication Bus F Performance | Hard |
| U0082 | Vehicle Communication Bus F (+) Open | Hard |
| U0083 | Vehicle Communication Bus F (+) Low | Hard |
| U0084 | Vehicle Communication Bus F (+) High | Hard |
| U0085 | Vehicle Communication Bus F (-) Open | Hard |
| U0086 | Vehicle Communication Bus F (-) Low | Hard |
| U0087 | Vehicle Communication Bus F (-) High | Hard |
| U0088 | Vehicle Communication Bus F (-) Shorted to Bus F (+) | Hard |
| U0089 | Vehicle Communication Bus G | Hard |
| U008A | Vehicle Communication Bus G Performance | Hard |
| U008B | Vehicle Communication Bus G (+) Open | Hard |
| U008C | Vehicle Communication Bus G (+) Low | Hard |
| U008D | Vehicle Communication Bus G (+) High | Hard |
| U008E | Vehicle Communication Bus G (-) Open | Hard |
| U008F | Vehicle Communication Bus G (-) Low | Hard |
| U0090 | Vehicle Communication Bus G (-) High | Hard |
| U0091 | Vehicle Communication Bus G (-) Shorted to Bus G (+) | Hard |
| U0092 | Vehicle Communication Bus H | Hard |
| U0093 | Vehicle Communication Bus H Performance | Hard |
| U0094 | Vehicle Communication Bus H (+) Open | Hard |
| U0095 | Vehicle Communication Bus H (+) Low | Hard |
| U0096 | Vehicle Communication Bus H (+) High | Hard |
| U0097 | Vehicle Communication Bus H (-) Open | Hard |
| U0098 | Vehicle Communication Bus H (-) Low | Hard |
| U0099 | Vehicle Communication Bus H (-) High | Hard |
| U009A | Vehicle Communication Bus H (-) Shorted to Bus H (+) | Hard |
| U009B | Vehicle Communication Bus I | Hard |
| U009C | Vehicle Communication Bus I Performance | Hard |
| U009D | Vehicle Communication Bus J | Hard |
| U009E | Vehicle Communication Bus J Performance | Hard |