One problem related to manifold/header/muffler/tail pipe has been reported for the 2014 GMC Terrain. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2014 GMC Terrain based on all problems reported for the 2014 Terrain.
Plugged pvc orifice in intake manifold. Pvc orifice was plugged due to cold weather and was filled with ice and other sludge. This caused pressure to build and blow the rear crankshaft main bearing seal. This caused the vehicle to lose all oil and subsequently stall. Engine stall occurred while vehicle was being driven and without any warning.