Two problems related to alternator/generator/regulator have been reported for the 2012 GMC Acadia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 GMC Acadia based on all problems reported for the 2012 Acadia.
My GMC Acadia denali has a little over 80,000 miles. I have other vehicles for everyday use so I only drive the Acadia for long distances over the weekend. The vehicle sits in the garage when not in use. I have had no issues with the vehicle until I took it to the dealer to have one of the head light bulbs on the passenger side replaced. After I picked the vehicle up I drove it to new york and on my way back (the next day) had the service light come on to let me know there was a problem with the battery. I looked at the battery indicator in the dash and noticed the charge was getting lower and lower. By the time I got to baltimore, MD the indicator was below 12 and the vehicle finally shut off. Towed the vehicle to the dealership and they first replaced the battery but that didn't fix the problem. They then replaced the alternator. I drove the vehicle three times and it worked fine. Three weeks later I tried to start the vehicle and had no battery power. Tried jumping the vehicle but it would not gather enough powere to start the engine. Had the vehicle towed to the dealer. They said that the new battery that was installed had a bad cell. I am afraid that's not the issue; it's obvious that something is draining the battery when the car is not in operation and it all started when I had the headlamp. I think gm is aware of electrical issues with the Acadia. I just want to make sure I put this complaint out there. I am not confident that this problem won't occur three weeks from now.
When we first purchased the vehicle the alternator went bad. The dealer replaced the alternator and battery for us. Then 6 months later the alternator went out again. They again replaced the alternator. Since then the vehicle has had a dead battery at least 4 times. Also noticed that when it rains you can hear water sloshing in the ac vents and then pours down from under dash on both the passenger and drivers side. Now my sound in the vehicle has started to cut on and off. This water issue is obviously leading to the electrical issues.