I have a 2012 Buick Lacrosse A few days ago it wouldn't start and appeared to be the battery or related issue. I just started it, ran it for a while, then turned it off and restarted it just fine. Well a few hours later it wouldn't start again. I jumped it a second time and took it to Autozone to be tested; the battery, alternator, and starter were all said to be fine. I replaced the key fob battery and nothing. I checked the fuses and they're all fine too.
So basically the car doesn't have power for ANYTHING, the key fob won't lock/unlock anything, and I can't push the brake down to put the car in neutral ... but the car will start and work fine when jumped. What could the problem be?