Four problems related to manifold/header/muffler/tail pipe 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.
The contact owns a 2012 GMC Terrain. The contact stated while driving 30 mph the vehicle was consuming engine oil. The contact stated no warning light was illuminated. The contact took the vehicle to an independent mechanic who diagnosed. The contact took the vehicle to the local dealer, where it was diagnosed with needing the manifold on the engine to be replaced. The vehicle was not repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 92,000.
Burns oil, which gm will cover to fix but will not cover the issues that happens when oil is burnt and what it caused. Had to replace exhaust manifold, O2 sensor, catalytic converter and cam shaft senors; these I had to pay for out of pocket. Not sure exactly when it happened but was middle of 2019. Went to GMC about how to get resolved on an issue that they caused that I had to pay for, which first resulted in a 1 yr engine warranty which they pulled with out my knowledge, then after a complaint to the bbb the best they could offer was a $1000 coupon for a new car. Gm should cover those other issues since its an issue they know and fixed.
Engine blew in vehicle due to excessive oil consumption from piston ring damage. Car had only 95k miles. Vehicle was being driven at 20 mph, bucked and turned off completely. We notified gm dealership at every oil change of excessive consumption. We put in a quart of oil every 1000 miles . A consumption test was never recommended . We then could not do one as the engine blew. Also damaged exhaust manifold , O2 sensors and cat converter . We have also replaced the manifold and sensors and have the cat converter repair this week. All told over 5000$ in damages that we have paid out of pocket. There was no recall for the piston rings. Some vehicles have since been issued a letter indicating that emissions issues due to excessive oil consumption would be repaired at no cost. Our car apparently did not meet that criteria . A lawsuit against gm has been litigated and won for the excessive consumption . We are part of the class action however have already been denied once for unknown reason. We resubmitted 3 months ago and have heard nothing. It is criminal that these vehicles have not been completely recalled .
Excessive engine oil consumption. Timing chain failure. Pistons, rings, exhaust manifold, muffler, door regulator, wiper motor, transmission failure. Vehicle cannot be driven.