This truck has more than one 5v regulator and we are chasing a problem on the REF 2 circuit (P0651). It is also setting false random misfire (P0300) and crank sensor (P0335) trouble codes.

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Related videos:
How to check the 5v reference circuit for a short to ground (Cadillac)
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No Start from a shorted MAP sensor (Honda, Acura)
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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