Fault code: 42049 SCANIA

Error identification:

The pressure in the SCR system does not fall as expected when the injection valve is open.

Cause:

The fault may be due to:

Frozen reductant in the pressure line.

Frozen or crystallised reductant in the reductant doser, pipes or injection nozzle.

Notes:

The fault causes reductant injection to be switched off.

Action:

Check that the coolant level in the engine is not too low.

To check that heating of the line between the main unit and the reductant doser is working. Start the engine and check that the suction pipe is getting warm. If not, check that coolant from the engine is reaching it as it should do. Also check that the water valve is opening fully.

If heating is taking place, remove and clean the injection nozzle, reductant doser and pipes.

Carry out the system checks that are available in SDP3 for the SCR system. The system checks can help to detect some of the above faults.

To verify that the fault has been rectified and that the fault code does not recur, you can click on fault code monitoring and look at the fault code. This fault code is not activated immediately. In order for the control unit to set an active fault code, the fault must occur in four consecutive cycles, i.e. the power must be turned off and on four times with the starter key. You can use fault code monitoring to see whether the fault code is pending, i.e. the fault code is about to be generated.