Needing help my car want crank when it did crank it was but for bout 2 or 3 second . I replaced key switch/ignition. And battery.starter.altenator. bcm. My security light is on. Flashing. I'm going to flash/reset my ecm in the morning will this do me any good ?
2002 Monte Carlo ss 3800

 

Needs a CASE relearn. If you go on ZZP’s website they have multiple CASE relearn methods pretty well written under the 1.0 PCM description. Takes about 30mins to do. Flashing the PCM shouldn’t do anything for you to gain.