Two problems related to battery have been reported for the 2008 GMC Acadia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 GMC Acadia based on all problems reported for the 2008 Acadia.
I own a 2008 GMC Acadia with melting headlights. The plastic housing is melting and the bulbs are melting into the sockets. I have had problems for many months with the electrical system including replacing 3 batteries in 1 1/2 years. I have had the vehicle checked by the dealer which finds "no problem" with the electrical system, and no explanation for the battery life. With intense heat that would be necessary to cause this socket to melt, metal and all, is of great concern, and is a potential fire hazard. This vehicle also was involved in a recent recall for possible fire with heated windshield wipers (now disconnected). Hopefully, this can be investigated, so that no one gets hurt.
Turned down a road and felt something pop and then the transmission would not shift out of 2nd. Gear. Since then have had several issues with the transmission shifting to excessively. That some issues with extremely excessive shifting. Once my wife pulled out into traffic and the transmission would not shift causing a man in a truck to slid off of the road to avoid hitting her because the vehicle would not shift and go down the road. And also with the battery dying for no reason. This has happened 4 different times.