I own a 2007 monte carlo with 93k miles on it. I was driving the car and out of nowhere my check engine light, ABS light, service traction control, service tire pressure system came on. (However no reduced power system came on) So as I'm turning around to drive back home all of my gauges drop as if the car was shut off so i couldn't see how fast i was going or how much gas was in the car or the RPM. I then noticed that my acceleration from stop to go was extremely slow so once i got back to the house and turnt the car off, it was still running. After 10 min, i hit the OEM remote start button and then the lock and it shut off. I then went to try and start the car again and nothing. Dead. I had it towed to a local midas and after the diagnostic test they said that my starter was getting half the power to it and would need to be changed and the ignition switch they said that the abs and traction control and tps were fine. After having it changed think that would resolve the issue. It was firing up fine but the now the when starting and shutting the car off it still runs for 15-20 seconds and then it turns off. I open the driver side car door and it beeps like the key is in the ignition when its not so i put the key in and turn it to the on position and turn it off and take the key off and it stops beeping. (Beeping as in car door ajar with key still in it). I drove it to work a couple of days ago and on a cold start it fired right up but it still accelerated slow up until i get it up to 45-50+ miles an hr. Then it seem to accelerate normal but when i come to a stop and accelerate it still accelrates slow. I got out of work and tried to start it and it was dead. Lights and everything still worked and i had the battery check out and my battery is fine so i give it a cppl mins and tried to start again. Still nothing. So i have it 5 more mins and tried to start it again and it eventually started up and i drove my beautiful ss like a turtle. Im wondering if my BCM would be the cause of the slow acceleration and the car taking 15 seconds after the car is has been turned off to finally shut off. Ive also noticed that now that my gauges are back working but now my check engine light is on along with my tps light and traction control light. Havent had the money to take to a dealer to get a diagnostic test to check the BCM. This has been my worst nightmare. Any insight on what may be happening?

 

I Had a sort of similar issue a while back on my 06 SS. My car sits in the garage most of the time. Its just a toy basically. Anyhow I had let it sit for about 4 months inside the garage untouched. When I decided to get it out finally the battery was dead a hell. Tried to charge it up but no good. So I put a new battery in it, And the car started and ran fine. but still had different messages and lights on the dash. Like service charging system etc.
The alternator was charging fine and the car ran and drove fine though other than those stupid messages and lights. Turns out there was an update for the BCM to be reflashed that needed to be done to get everything back to normal. No idea if the car sitting so long it lost all its prior memory or wtf. But its been fine since the reflash of the bcm.
And note to self, I keep a battery tender on it now when sitting for more than a couple weeks.

 

I had one go out before and it sounds the same. They replaced it at the Garage and all was well. I did some research on this subject and found several vids on it at youtube check the link. good luck


https://www.youtube.com/results?sear...onte+carlo+bcm