Check Engine light came on - Codes P0642 and 2004 - what do these mean and what are possible solutions?
What are codes P06742 and 2004 on 2007 Volkswagen Passat
This is for an ECM short or poor electrical connection. The ECM may need replaced or there is a shorted sensor on 5 volt circuit. The 2004 code is for an intake manifold runner control bank 1 stuck open. This could be the cause of the ECM fault code. Check the manifold runner for a possible short.