Join Date: Dec 2009
Location: Fayetteville, NC
I would doubt that is the case. If that were the case, then whatever "stock tune" GM installs would no doubtedly be wiped out as well causing you to have to take a trip to the dealer after reinstalling the battery. I would think the PCM memory is more like a hard drive or non-volatile memory meaning if it loses power, it doesn't lose what's stored on it. Again, I'm not the expert but losing the tune changing out your battery doesn't make sense IMO.