2002 Grand Am V6.
Happened late last Sunday night. Drove the car after cold start 15 mins to Fairlanes and was in there for about an hour.
Came out, put the key in and cranked. Let it go before it started because I was paying attention to something else. Tried again and car would just crank and crank. First thing I notice is there is dead silence from the fuel pump whenever I'm turning the ignition on. So I get out and under the tank with a hammer while someone else cranks. Nothing.
Open the hood and pull out the fuel pump relay from the fuse block. Doesn't smell burned so I put it back in.
So, I sat down for a few minutes and thought about my next move. All in all, about 10-15 minutes passed since the last crank attempt. I decide to give it one more try. I hear the fuel pump energize as soon as I turn it and the car starts no problem.
Next day, car starts fine again so I go to work. At lunch, I haul out the AVR machine on a hunch and test the battery. Battery drops to 10.06 volts under load and obviously tests bad.
We had a Malibu in the shop one time that kept going into theft mode and we couldn't figure it why. We sent it to the dealer and they cited the battery as being the cause. They said when the volts drop to 10.5 or lower when cranking, the car can enter theft mode.
So I put a new battery in and haven't had a problem in a week.
My question is does that ring true with you real GM techs in here?