Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information DEM-U03004A

Condition
The Differential electronic module (DEM) checks the configuration in the connector to the differential unit (AOC unit).

Note! A control module from another make of vehicle with a similar four wheel drive system can be incorrectly installed in a Volvo.

The diagnostic trouble code (DTC) is stored if the control module detects that:
- The connector in the control module does not have the correct configuration.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Ignition switch position II.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.





Substitute value
- Four wheel drive is disengaged.

Possible source

- Incorrect Differential Electronic Module (DEM).

Fault symptom[s]
- 4-wheel/all wheel drive/Does not work
- Text window and warning symbol/Text message