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.
How to check the 5v reference circuit for a short to ground (Cadillac)
No Start from a shorted MAP sensor (Honda, Acura)
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Troubleshooting A Shorted 5V Reference Circuit (Chevy Silverado)