Okay so, my fault I did not put the cover back on the battery after boosting, and if you didn’t know the pcm/ecm (not sure which is correct term) is mounted on said cover. I drove it to a shop to have it looked at for safety, got my list, and was excited to take on the challenge of fixing the few issues it has. However on my drive home everything went wrong. Dash lit up, all gauges going completely haywire, transmission shifting irregularly. So I stopped tried to go again it stalled with white smoke coming out from under the hood. No start! So I say great, got it towed home and guess what smelled of burnt electrical, none other than the pcm/ecm.

So my question is where do I go from here? I’d like to test to be sure of the issue before spending money on a new one, and I just got thinking right now actually, would it not being mounted correctly, have cause it to burn or is there another issue at Hand. Anyways I know I need to test it somehow but I can’t find diagrams anywhere. I am certainly not a professional, in fact I have little to no experience dealing with electrical issues, but I am willing to try. How do I test the functionality of the pcm/ecm? And in the case of replacement how does the programming work? Can I install the replacement and drive it to the dealer to have it programmed. Or does that all need to be done before it’ll start. any help would be appreciated

 

To be frank you're not equipped to diagnose, repair or program. Paying a shop is well worth it in time and money not to mention frustration. At the very least you'll need a scanner and not just a cheap OBDII scanner but one that can check all modules for power and communication issues. A junkyard PCM with matching part number. A laptop or tablet and a subscription to Alldata or similar and access to GM Techline Connect service. Setting yourself up with the tools and information alone would be in excess of a grand easily. Gone are the days of switch and relay controls. Not to demean your talents but all this difficulty is partly by design. Support Right To Repair legislation whenever you see it. Meanwhile a trip to the auto recyclers to find a matching module would be time well spent. Good Luck!