Northstar Engines and System Technical Discussion Discussion, HELP...car wont start in Cadillac Engine Technical Discussion; 2001 Seville SLS (Northstar 4.6) will NOT give us the time of day. it made NO noises when turning key. ...
Sounds like you have some major electrical problem.
Turn on your headlights, and turn the ignition key as if it start it. What do the lights do?
I think you're ultimately going to have to bring it to the dealer. Checksum error is very bad. It means your ECM was fried somehow. It may not be permanently damaged, but it's memory was probably erased. I don't know if the theft system will disable the starter or not on the 2001 model, but I really do think you've got one or more big problems.
Did this happen suddenly? Was your car hit by lightning?
I had a similar problem.. car wouldnt start...but all electrical worked (windows lights etc.) In my case the cluster computer was fried...3500$ for a new unit...luckily there just happens to b a place around here that remans them for 500 bux...but if u can pull your codes then Id say its something else...so really I am of no help at all