| Mercedes Fault Code | Fault Code Meaning |
|---|
| U0002 | High Speed CAN Communication Bus Performance |
| U0003 | High Speed CAN Communication Bus (+) open |
| U0004 | High Speed CAN Communication Bus (+) low |
| U0005 | High Speed CAN Communication Bus (+) high |
| U0006 | High Speed CAN Communication Bus (-) open |
| U0007 | High Speed CAN Communication Bus (-) low |
| U0008 | High Speed CAN Communication Bus (-) high |
| U0009 | High Speed CAN Communication Bus (-) shorted to Bus (+) |
| U0010 | Medium Speed CAN Communication Bus |
| U0011 | Medium Speed CAN Communication Bus Performance |
| U0012 | Medium Speed CAN Communication Bus (+) open |
| U0013 | Medium Speed CAN Communication Bus (+) low |
| U0014 | Medium Speed CAN Communication Bus (+) high |
| U0015 | Medium Speed CAN Communication Bus (-) open |
| U0016 | Medium Speed CAN Communication Bus (-) low |
| U0017 | Medium Speed CAN Communication Bus (-) high |
| U0018 | Medium Speed CAN Communication Bus (-) shorted to Bus (+) |
| U0019 | Low Speed CAN Communication Bus |
| U0020 | Low Speed CAN Communication Bus Performance |
| U0021 | Low Speed CAN Communication Bus (+) open |
| U0022 | Low Speed CAN Communication Bus (+) low |
| U0023 | Low Speed CAN Communication Bus (+) high |
| U0024 | Low Speed CAN Communication Bus (-) open |
| U0025 | Low Speed CAN Communication Bus (-) low |
| U0026 | Low Speed CAN Communication Bus (-) high |
| U0027 | Low Speed CAN Communication Bus (-) shorted to Bus (+) |
| U0028 | Vehicle Communication Bus A |
| U0029 | Vehicle Communication Bus A Performance |
| U0030 | Vehicle Communication Bus A (+) open |
| U0031 | Vehicle Communication Bus A (+) low |
| U0032 | Vehicle Communication Bus A (+) high |
| U0033 | Vehicle Communication Bus A (-) open |
| U0034 | Vehicle Communication Bus A (-) low |
| U0035 | Vehicle Communication Bus A (-) high |
| U0036 | Vehicle Communication Bus A (-) shorted to Bus (+) |
| U0037 | Vehicle Communication Bus B |
| U0039 | Vehicle Communication Bus B (+) open |
| U0040 | Vehicle Communication Bus B (+) low |
| U0041 | Vehicle Communication Bus B (+) high |
| U0042 | Vehicle Communication Bus B (-) open |
| U0043 | Vehicle Communication Bus B (-) low |
| U0044 | Vehicle Communication Bus B (-) high |
| U0045 | Vehicle Communication Bus B (-) shorted to Bus (+) |
| U0046 | Vehicle Communication Bus C |
| U0047 | Vehicle Communication Bus C Performance |
| U0048 | Vehicle Communication Bus C (+) open |
| U0049 | Vehicle Communication Bus C (+) low |
| U0050 | Vehicle Communication Bus C (+) high |
| U0051 | Vehicle Communication Bus C (-) open |
| U0052 | Vehicle Communication Bus C (-) low |
| U0053 | Vehicle Communication Bus C (-) high |
| U0054 | Vehicle Communication Bus C (-) shorted to Bus (+) |
| U0055 | Vehicle Communication Bus D |
| U0056 | Vehicle Communication Bus D Performance |
| U0057 | Vehicle Communication Bus D (+) open |
| U0058 | Vehicle Communication Bus D (+) low |
| U0059 | Vehicle Communication Bus D (+) high |
| U0060 | Vehicle Communication Bus D (-) open |
| U0061 | Vehicle Communication Bus D (-) low |
| U0062 | Vehicle Communication Bus D (-) high |
| U0063 | Vehicle Communication Bus D (-) shorted to Bus (+) |
| U0064 | Vehicle Communication Bus E |
| U0065 | Vehicle Communication Bus E Performance |
| U0066 | Vehicle Communication Bus E (+) open |
| U0067 | Vehicle Communication Bus E (+) low |
| U0068 | Vehicle Communication Bus E (+) high |
| U0069 | Vehicle Communication Bus E (-) open |
| U0070 | Vehicle Communication Bus E (-) low |
| U0071 | Vehicle Communication Bus E (-) high |
| U0072 | Vehicle Communication Bus E (-) shorted to Bus (+) |
| U0073 | Control Module Communications Bus Off |
| U0100 | Lost Communication with ECM/PCM A |
| U0101 | Lost Communication with TCM |
| U0102 | Lost Communication with Transfer Case Control Module |
| U0103 | Lost Communication with Gear Shift Module |
| U0104 | Lost Communication with Cruise Control Module |
| U0105 | Lost Communication with Fuel Injector Control Module |
| U0192 | Lost Communication with Television |
| U0197 | Lost Communication with Telephone Control Module |
| U0198 | Lost Communication with Telematic Control Module |
| U0222 | Lost Communication with Door Window Motor A |
| U0235 | Lost Communications with Cruise Control Front Distance Range Sensor |
| U0301 | Software Incompatibility with ECM/PCM |
| U0302 | Software Incompatibility with TCM (Transmission Control Module) |
| U0303 | Software Incompatibility with Transfer Case Control Module |
| U0321 | Software Incompatibility with Ride Level Control Module |
| U0326 | Software Incompatibility with Vehicle Immobilizer Control Module |
| U0327 | Software Incompatibility with Vehicle Security Control ModuleMercedes new Bosch drive-by-wire throttle body failing |
| U0038 | Vehicle Communication Bus B Performance |
