One problem related to alternator/generator/regulator has 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.
Emission control has went out twice within 3 months of being fixed. Cam shaft both sides had to be replaced. 4 times with 6 months the fuel light has came on stating the cap needs repaired, even though it was replaced. Alternator, battery has been replaced October 2019, while in another sate. Engine light has been on since I purchased it in Feb. 2019. Electrical shortage because of previous right side damage. Throttle has went out, while driving 65 on highways. Stability control stopped working. Crankshaft was replaced. Exhaust leak. Body control short, jerking while driving, timing warning.
| Electrical System problems | |
| Car Will Not Start problems | |
| Battery Dead problems | |
| Starter problems | |
| Ignition Switch problems | |
| Crankshaft Position Sensor problems | |
| Wiring problems | |
| Alternator/generator/regulator problems |