05 chevy van after changing water pump 3 years ago check enginee light not reset now wont stay off

Question

2005 chevy express van 2500

Answer 1

There are soft code which when clear has to go through a set of monitor readiness and meet certain criteria before the code set, Then there are hard code, these set righ away, Unfortunately you have a hard code. Depeding on the code that has set will help determine the cause for the code to set.