Hi Anna , How's the truck run ? no problems ? This code just means someone had the battery disconnected or cleared the keep alive memory !
P1000 - Monitor Testing Not Complete
The on board diagnostic II (OBD II) monitors are performed during the OBD II Drive Cycle. The DTC will be stored in continuous memory if any of the OBD II monitors do not complete.
The DTC does not need to be cleared from the PCM except to pass an inspection/maintenance
My info shows it having something to do with the fuel pump. Hope this helps.
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