Network and communication

The vehicle's data buses and the modules on them. These codes usually indicate a module that has stopped responding or a wiring fault on the bus, rather than a mechanical failure.

U0xxxStandardised (SAE/ISO)

Standardised meaning, consistent across manufacturers.

• U00xxNetwork electrical98 codes
• U01xxNetwork communication100 codes
• U02xxNetwork communication36 codes
• U03xxNetwork software32 codes
• U04xxNetwork data32 codes
• U05xxU0500 – U05FFby structure
• U06xxU0600 – U06FFby structure
• U07xxU0700 – U07FFby structure
• U08xxU0800 – U08FFby structure
• U09xxU0900 – U09FFby structure
• U0AxxU0A00 – U0AFFby structure
• U0BxxU0B00 – U0BFFby structure
• U0CxxU0C00 – U0CFFby structure
• U0DxxU0D00 – U0DFFby structure
• U0ExxU0E00 – U0EFFby structure
• U0FxxU0F00 – U0FFFby structure

U1xxxManufacturer-specific

Check a source specific to your make and model year.

• U10xxU1000 – U10FFby structure
• U11xxU1100 – U11FFby structure
• U12xxU1200 – U12FFby structure
• U13xxU1300 – U13FFby structure
• U14xxU1400 – U14FFby structure
• U15xxU1500 – U15FFby structure
• U16xxU1600 – U16FFby structure
• U17xxU1700 – U17FFby structure
• U18xxU1800 – U18FFby structure
• U19xxU1900 – U19FFby structure
• U1AxxU1A00 – U1AFFby structure
• U1BxxU1B00 – U1BFFby structure
• U1CxxU1C00 – U1CFFby structure
• U1DxxU1D00 – U1DFFby structure
• U1ExxU1E00 – U1EFFby structure
• U1FxxU1F00 – U1FFFby structure

U2xxxManufacturer-specific

Check a source specific to your make and model year.

• U20xxU2000 – U20FFby structure
• U21xxU2100 – U21FFby structure
• U22xxU2200 – U22FFby structure
• U23xxU2300 – U23FFby structure
• U24xxU2400 – U24FFby structure
• U25xxU2500 – U25FFby structure
• U26xxU2600 – U26FFby structure
• U27xxU2700 – U27FFby structure
• U28xxU2800 – U28FFby structure
• U29xxU2900 – U29FFby structure
• U2AxxU2A00 – U2AFFby structure
• U2BxxU2B00 – U2BFFby structure
• U2CxxU2C00 – U2CFFby structure
• U2DxxU2D00 – U2DFFby structure
• U2ExxU2E00 – U2EFFby structure
• U2FxxU2F00 – U2FFFby structure

U3xxxReserved

If this appears, treat it as manufacturer-specific.

• U30xxU3000 – U30FFby structure
• U31xxU3100 – U31FFby structure
• U32xxU3200 – U32FFby structure
• U33xxU3300 – U33FFby structure
• U34xxU3400 – U34FFby structure
• U35xxU3500 – U35FFby structure
• U36xxU3600 – U36FFby structure
• U37xxU3700 – U37FFby structure
• U38xxU3800 – U38FFby structure
• U39xxU3900 – U39FFby structure
• U3AxxU3A00 – U3AFFby structure
• U3BxxU3B00 – U3BFFby structure
• U3CxxU3C00 – U3CFFby structure
• U3DxxU3D00 – U3DFFby structure
• U3ExxU3E00 – U3EFFby structure
• U3FxxU3F00 – U3FFFby structure