Unknown DTCs within the Volvo Application

Under correct use, the Volvo application will very rarely return unknown DTCs to the user. However, there is a situation when the user may experience this. This may happen when the ECU cannot be recognised from the identifier code returned when queried. This can happen when an ECU has been updated with later software by the dealer. When this happens the Volvo application can't identify it correctly so has to rely on the information entered by the user, i.e. the model, model year and system. It is quite possible for the model year selected to be incorrect. Therefore, it is always useful to try accessing the system using the model year either side of the one originally selected. Should the user still experience the same unknown DTC then please contact Autodiagnos supplying the full vehicle details including VIN, the ECU identifier string, ECUDIAG code (if displayed) and the unknown DTC number so this can be investigated.