One problem related to horn assembly has been reported for the 2010 GMC Terrain. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 GMC Terrain based on all problems reported for the 2010 Terrain.
Engine cutting out and dying while driving, horn honking at times, vehicle starts itself sometimes, blowing fuses. Vehicle tried to die on my wife while driving almost causing a serious accident. Dealer has not found a solution yet. They have replaced the bcm with no good results.