Three problems related to manifold/header/muffler/tail pipe have 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.
My exhaust manifold has a crack/broken in it. It started out with a little noise, but, now it is roaring under the hood. Exsessive amount of exhaust gasses and smell into the cabin, and has caused numerous headaches from noise and smell. During start up, driving around town, on the highway, in the hot or cold.
In sept. 2017, the dealer fixed the catalytic converter b/c it was under a "special warranty" for free however I had to pay $582 to replace the cracked manifold which caused the converter issue. I recently went to the dealership b/c the check engine light came on again, the catalytic converter is still under warranty and they have to fix the oil consumption problem the is under a "special coverage" and again I was told that I had to pay for another cracked manifold. I asked what causes it and why and was told they did not know but I believe it must have to do with the original catalytic converter issue. I understand that there is a special coverage to fix the cc however something must be causing it to fail and gm is aware of it.
Tl the contact owns a 2010 GMC Terrain. While the vehicle was stationary or while driving various speeds, the engine indicator illuminated. An independent mechanic replaced the catalytic converter twice in the vehicle, but the failure recurred. It was later determined that there was a cracked intake manifold and moisture in the manifold. A dealer was not contacted about the failure. The manufacturer was not made aware of the failure. The failure mileage was unknown.