How to clear the DTCs (check engine light) on your Cummins without using a code reader.
NOTE: Depending on which flash is on your PCM, there is a chance that this procedure will not work. In that case, it is best to use an OBD-II scanner to clear the codes.
Put the key in the ignition with doors closed.
Cycle the key FIVE times from the OFF position to the RUN position without cran... read more ›