U0305
Software Incompatibility with Cruise Control Module
- Severity
- Low
- Driving
- No driving restriction
The software in the cruise control module is not compatible with the rest of the vehicle. Cruise control will not be available. Nothing about the way the car drives or stops is affected - and on many vehicles this appears after cruise control has been retrofitted without the rest of the car being told about it.
Possible causes
- CommonThe cruise control module replaced but never coded to this vehicle
- CommonCruise control retrofitted without coding the vehicle's option list
- CommonUsed module fitted from a different vehicle or specification
- CommonSoftware update interrupted during programming
- CommonWrong part number - adaptive and conventional cruise modules are not interchangeable
What you might notice
- Cruise control will not engage
- Cruise control warning message
- Cruise control switches doing nothing
- No effect on ordinary driving
What to check, in order
- Ask whether cruise control was retrofitted. Fitting the hardware without coding the vehicle to expect it is a very common cause of this code.
- Check whether the vehicle's option coding lists cruise control as fitted.
- Check the part number - adaptive cruise and conventional cruise modules look similar and are not interchangeable.
- Confirm ordinary driving is unaffected, in which case this can wait.
- This needs manufacturer-level coding rather than a replacement part.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
U00xxU01xxU02xxU03xxU04xxU05xxU06xxU07xxU08xxU09xxU0AxxU0BxxU0CxxU0DxxU0ExxU0FxxU10xxU11xxU12xxU13xxU14xxU15xxU16xxU17xxU18xxU19xxU1AxxU1BxxU1CxxU1DxxU1ExxU1FxxU20xxU21xxU22xxU23xxU24xxU25xxU26xxU27xxU28xxU29xxU2AxxU2BxxU2CxxU2DxxU2ExxU2FxxU30xxU31xxU32xxU33xxU34xxU35xxU36xxU37xxU38xxU39xxU3AxxU3BxxU3CxxU3DxxU3ExxU3Fxx