Two problems related to transfer case have been reported for the 2012 GMC Terrain. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 GMC Terrain based on all problems reported for the 2012 Terrain.
Transfer case went at 67k just bought it used at 63k. I had no warranty only 60 day from used dealer I bought it from. Ruined my passenger side axel also when transfer case went $1137 was the bill. 500 for used case 16k 170 for axel 30 for fluid rest in labor. Should be a recall car sounded awful back up and in drive loss a bit of power when driving. Also.
While driving a short distance on a city street I heard a thud followed by a grinding noise and lack of power. Vehicle was towed to a trusted mechanic that I have known and used for years. Diagnosed with a crack in the transfer case. Mechanic had difficulty finding a part and was informed by someone at the GMC dealer that this part was on back order because of an issue known by GMC but a recall had not been issued. New part would not be available for over a month and repairs were needed since it is my primary vehicle. A used part with a warranty was found and was installed for a total of $1500. Vehicle power train warranty was expired. Less than 3 months after transfer case was replaced with a used part - the replacement part cracked in the same exact spot as the original. Luckily, the part was still covered by a warranty but local mechanic recommended diagnosis by dealer to determine if there is an issue with the transmission. Contacted GMC to see if they were aware of the issue and they said they were not.