I am a little concerned over the possible loss of "flash" memory if I unplug the old PCM and swap with the replacement I have. Incidentally, the replacement is a previously installed unit.

No worries mate////the pcm will retain its "flash" indefinately///i swapped mine for a used unit...was out of a grand prix////fuel gage didnt work right....i put the old pcm back in.....no problems...good luck.....

Hi:

Thanks again to everyone'* replies - the info is always appreciated. Not that I am doubting, but can anyone else confirm that swapping PCM'* will not cause the loss of the flashed programming? Towing to the nearest dealership would be a little expensive....

Thanks again.

just bought a used pcm for my 97 that was sitting on the shelf for two years...put it in...started right up////no problems..you'll be fine....

Hi

I recently had to replace the PCM in my 96 Bonneville to fix a high idle problem. I called a local salvage yard and was able to buy a PCM that came out of the same year Bonneville and I did not have to have it reflased. It fixed my problem and I was very happy. He just wanted the old one back.

When I first called the yard, he was going to sell me one out of a 96 Monte Carlo which meant that I would of had to have it re-flashed. I called the local Pontiac dealer and he quoted me $70.00. Luckily when I called the yard back, he was able to find one out of a Bonneville.