Six problems related to crankcase (pcv) have 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.
As I was driving on December 24, 2022, (the temperature outside was 7 degrees). I heard my vehicle making a funny sound. I pulled over to a safe location then my truck cut off by itself. I got out of my truck and noticed that oil was on the back of the rear tire wall and on the ground. I had to get it towed to a repair shop. They told me a couple days later that the pcv valve was gone and that caused the rear main seal to go bad. Several days later, I happen to see a recall on youtube about the pcv valve that GMC had issued back in March 2015, but I never received a letter through the mail. To get this fixed it’s gonna cause me a lot of money. Unless GMC is willing to pay for it.
My pcv valve clogged and caused the rear main seal to blow out. This is a common known problem with this vehicle and gm has recalled certain vins with the same issue and the same engine. Now my car is at the dealership having $1200 worth of work done that could have been prevented with a $12 part. I just had my vehicle at a gm certified shop 7 months ago for warranty work and was not notified of this possible problem.
Pcv system froze. . . Air cleaner has water in it// rear main seal pushed out due to excessive crankcase pressure. #14882 special coverage adjustment covers exact issue however my VIN is not included. Requesting my VIN be added to #14882 special adjustment as it applies to my exact make/model/year and issue.
On Jan 1st it was 3�f out my wife wormed up her Terrain we drove it approximately 12 miles when we started to smell something burning. Next came the engine knocking really bad. We stopped the Terrain and had it towed to the dealership found out the rear main seal blew with such force that the oil covered the muffler. This happened from the pcv being plugged and/or frozen from the cold weather. I recently found a service bulletin for that year make and model that indicates that will happen and there is a special coverage for that. (14882: special coverage adjustment) I also received a letter from GMC about high oil consumption warranty. The Terrain may exhibit engine oil consumption. That is also a part of that 14882:adjustment now to the point I was told that this issue my wife's Terrain would be covered under the 100k/5year power train warranty our Terrain only has 71k miles on it. But the 5year are up. So gm is not taking responsibility for this issue according to both special coverage the 14882: they adjusted to 10 years or 120k miles but they are claiming even though its for that year make and model and engine and that everything that's listed is what happened to our GMC its not for our Terrain. I told them I also had a letter that they sent to us stating the oil consumption that has a adjustment of 7years 6months/120k warranty witch was part of that 14882: special coverage they still will not take responsibility for fixing. I believe we are getting taken advantage of in this situation. They are making us pay for all repairs it may need a new engine in result of the rear seal blowing because it lost all the oil. But we would not know till the repairs start or after all repairs are made and the engine seizes. I also was told from the dealer that if we fix it and drive it down the road there is no guaranty that it will not happen again.
On the 2. 4l ecotec engine, the pcv orifice in the intake manifold becomes clogged which causes oil to be pulled into the engine combustion chamber and burned. This causes an excess build up of carbon inside the engine and on the spark plugs which in turn causes the vehicle to idle roughly and stall out while sitting idle, such as at a stop light. Gm has issued a special coverage service bulletin (#: 14882) but only for specific VIN's. It has become known that there are many other vehicles that fall under the year groups stated by gm in their service bulletin, even if it's a VIN that they deem is safe from the problem, but they refuse to recall the vehicles even if they are affected by the known problem. This is a safety issue that causes the vehicle to die while trying to leave from a stationary position once the engine has warmed up, for example passing through an intersection after a red light.
The contact owns a 2012 GMC Terrain. While driving approximately 35 mph, there was an abnormal noise coming from the engine and the vehicle started to decelerate. The contact coasted into a parking lot and noticed an oil odor around the vehicle. The contact noticed that the vehicle was leaking oil all over the parking lot. The vehicle was towed to an independent mechanic where it was diagnosed that the pcv valve was frozen and was not circulating caused by excessive pressure leaking out oil. The intake manifold and cam cover needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 11,000.