Six problems related to manifold/header/muffler/tail pipe have been reported for the 2011 GMC Terrain. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 GMC Terrain based on all problems reported for the 2011 Terrain.
On 08/05/2020 I was sold this vehicle with a cracked manifold. Upon replacement of the manifold it was discovered that two manifold bolts were seared on the engine block side. After consulting my mechanic and another, I was advised that 1) to repair the engine has to be lifted as the space between the firewall and the engine is too small to make repairs without lifting the engine ( manufacture defect) . Further, it was advised to me that completely sealing the manifold could lead to a fire in the catalytic converter because � these engines run hot�. As I expressed that this vehicles �antifreeze� level is not stable as I have experienced with other vehicles. In other words this vehicle burns up antifreeze quicker than I've seen occur in other vehicles. After researching the topic it was discovered by consumer reports that these vehicles have major defective engines with repairs to manifold being notorious. And to have to have the engine lifted each time is unreasonably costly. And I no longer feel safe driving this vehicle if a defective engine runs hot and there's a risk of fire. This is exacerbated by the fact of the tiny space between the engine and firewall within the vehicle.
2011 GMC Terrain with cracked exhaust manifold found during safety inspection.
Tl the contact owns a 2011 GMC Terrain. The contact stated that the vehicle exhibited the same failure as listed in the manufacturer special coverage adjustment (plugged pcv orifice in intake manifold sb-10057977-8108, bulletin no. 14882). Bob brown Buick GMC (1405 se oralabor rd, ankeny, IA 50021, (515) 344-3574) diagnosed that the rear main seal failed and needed to be replaced. The vehicle was not repaired since it was excluded from the manufacturer service campaign. The manufacturer was notified. The vehicle was unable to be driven. The approximate failure mileage was 113,000.
Tl the contact owns a 2011 GMC Terrain. While driving approximately 65 mph, the contact heard a loud noise coming from the engine compartment. There were no warning indicators illuminated. The contact also stated that there was a fuel odor coming through the vents from the exhaust manifold. The vehicle was taken to an independent mechanic where it was diagnosed that the exhaust manifold detached and needed to be replaced. The vehicle was repaired, but the failure recurred. The vehicle was not taken to a dealer. The manufacturer was not notified of the failure. The approximate failure mileage was 116,707.
Exhaust manifold cracked, allowing fumes into car.
The contact owns a 2011 GMC Terrain. The contact stated that the tail pipe overheated while driving 50 mph, causing the rear cargo carrier basket to catch on fire. The fire spread to the bumper and the contact was able to extinguish the fire but the fire department was also present. The vehicle was taken to a local body shop for repair. The cause of the failure was not determined. The manufacturer was not made aware of the failure. The failure and current mileage was 25,232.