I did all of that. It just don't work on my car

 

Very odd, i have the blue and orange cheap elm 327 with torque pro on an android phone. Never had an issue in any chevy vehicle and i've used it in quite a few.

 

My ELM adapter is one just like the pic below. It's paired to my laptop and I use a program I had to buy (I believe it's called Scan Pro XL). As far as phone apps, Torque is one of the most popular and I've seen it work on a bunch of GM cars like our Montes. Going to '06+ would be where there *might* be issues from many GM cars (as that changed the network a bit in the car).

May want to check out another app for grins. Maybe even try re-pairing the adapter. Just weird it works on one vehicle and not the Monte.
Do you have access to another scanning device? Maybe someone messed up something with the ODB-II port. Just throwing out ideas....

 

I tried 2 other scanners and it worked. So I ordered the same model as my friends, and put my old one on offerup

 

Ok I got one that works. What did everyone put as the vehicle weight on the profile?

 

Here's what Car & Driver says for a 2004 SS, Supercharged.

DIMENSIONS:

Wheelbase: 110.5 in Length: 197.9 in
Width: 72.7 in Height: 55.2 in
Curb weight: 3530 lb

 

Well good new is the car is showing 0 kr