One problem related to service engine light on has been reported for the 2018 GMC Terrain. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 GMC Terrain based on all problems reported for the 2018 Terrain.
Purchased a brand new GMC Terrain. 12 days and 460 miles later the service engine soon light came on. Took it to dealership for a p050f. This is code for a leak in the booster. They did not repair anything, just checked for leak and reset engine light. As I read more, the problem affects the brakes ability to function properly increasing danger to driver. There is also defective stop/idle on the engine that no longer works. I was just driving down the road in town when it popped on. Gm and young's have refused to refund this defective vehicle.
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