just a w.a.g.
seat switch wiring? bad connection under the dash? bad ground or bad alt connection. a low battery, barely getting a charge will toss up weird intermittent codes like that.
does it have the sealed alt? (LPS rated truck)
Closely check the connections to the alt for a broken wire inside the insulation.
what voltage does the Alt put out at idle? under a load at idle? (Lights on?) what is the battery voltage at rest?
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