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First off, do you ahve the Cummins Insite software to be able to see waht the switch is showing to tule out any issues with it? You didn;t specify the model of the truck so I'm not sure if it has smart switches or analog switches. I would check there first.
Then if you are getting the full switch values for all stages, then flash the ECM. It may have a programming loss issue causing the issues you are having. I've seen that so many times that it has gotten to where I will automatically do that. Cummins has no explanation as to why it does it either.
Let me know the results of those steps.
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