Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-U041800

Condition
Engine control module (ECM) and Brake control module (BCM) contain a code that is unique code for each vehicle for electronic immobilizer. In addition to this, each key for the vehicle is electronically coded for the intended vehicle only. Internal checks are made at the start to check that the key is the correct one for the vehicle and that the immobilizer codes in the Engine control module (ECM) and Central electronic module (CEM) correspond.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- Engine control module (ECM) registers problems with reading out immobilizer codes.
- The immobilizer codes do not match.

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
- None.

Possible source
- Engine control module (ECM) has incorrect code for electronic immobilizer.
- Brake control module (BCM) has incorrect code for electronic immobilizer.
- Damaged engine control module (ECM).

Fault symptom[s]
- The engine does not start.
- Message in the display.