Could be literally anything that sets a code.
Depending on which truck and engine this should work.
Start with the key OFF,
Turn the key ON (not start just ON),Then OFF, ON, OFF, Now ON and leave
Now look in the odometer window and it should display the stored code.
It will read something like PXXXX with the x's replaced with the code(s)
stored. If there is more than one code there will be a small delay
between them, once the last stored code is displayed the
display will read PDONE telling you it is finished.
Turn the key OFF.
Post the codes you get with the Make-Model-Engine-Trans- Also any
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