I was wondering if gm can tell if i switch out my pcm. I have the gm stage 2 but i wanted a little more power while still maintaining my warranty. I was thinking that i will buy another pcm get it tuned and then switch back if i have any problems. Would they have anyway of noticing this?

 

negative i believe

 

If you have the stock stage II tune on one pcm, that was never tuned, and then have a completely separate pcm with a modded tune, and interchange them for dealer issues, I don't think you'll have a problem.

 

nope, you would need to do a crankcase relearn on the PCM which is a dealer only thing since they need to do it with a tech 2 scanner and $50 so they will know you changed the pcm anyway

 

Ahhh yes, the inevitable crankcase relearn. Forgot about that biatch...my bad...

 

Couldn't you just swap tunes?

 

yep. but if u know a friend that works at a GM dealer and can do the relearn then umm good stuff there lol only he will know

 

HP tuners will do a relearn.

 

^^ yup

 

on yeah thats what i was going to do but ended up using my own pcm so it was not needed

 

Yeah but gm has been checking for tunes lately