2017 GMC Terrain

The head unit quit working around 98k. The head unit is the radio, and screen which includes the back up camera. From what we have been told and find online, this is a known problem with them and affects other models as well. For the most part the head unit doesn't work but once in a while, once a month, it comes on but shows the Chevy logo on the screen which is odd because it is a GMC. Once you turn the car off, it will be gone again until it decides to come back. We took it into a dealer who tried to hook up to it and reprogram or update it, but he had no luck. Now we are without a backup camera that is a safety issue. I do not know why this isn't a recall as it is well known about issue.

NHTSA ID

11733049

Incident

Sep 1, 2025

Have had to replace the VVT solenoids several times within a year spam. Had to replace the rear main seal because it blew out due to carbon build up. Having issues with excessive oil consumption. Now the vehicle just started with: going from a stop position to accelerating at low speeds the vehicle stalls and dies. I want GM to take accountability and fix this issue as it is a safety issue to myself and everyone on the road.

NHTSA ID

11727804

Incident

Mar 25, 2026

Wiper blades transmission plastic parts keep popping or breaking this is the THIRD time this has happened at a cost of $350. Why would you use plastic parts for this knowing that it will break easily? Who can afford to keep replacing this? 12

NHTSA ID

11725197

Incident

Mar 15, 2026

The contact owns a 2017 GMC Terrain. The contact stated that after the vehicle was taken to a local car wash, while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the residence; however, the next day, the vehicle hesitated while starting. The message "Stabilizer - Power to Engine Reduced" was displayed. The vehicle was taken to a local independent mechanic, where it was diagnosed, and it was determined that the engine possibly needed to be replaced because the engine failed to turn over. The vehicle was towed to a local dealer, where it was diagnosed, and it was determined that the engine was blown. The contact was informed that the engine and the starter needed to be replaced. The vehicle was not repaired due to the cost and remained with the local dealer. The manufacturer was made aware of the failure. The failure mileage was approximately 104,750. The VIN was not available.

NHTSA ID

11720905

Incident

Feb 16, 2026

Mileage

104,750 mi

I had a message flash that said the power to the engine was reduce. Next message said check stabilink ( or something similar).. it said drive with caution. I live 2 mins from my job I drove home and pulled in the driveway I then felt the car act like it wanted to shake. This was on 2-10-26 I contacted onstar asked them to run a diagnostic. The codes that came back P0016 p0089 p228D are very well known codes with many people with the same vehicle/engine that have had to replace the engine. The engines have known issues had I known that maybe I could have replaced a part or two or three or four to have a stable vehicle now my vehicle is currently at GMC DEALER since Tuesday morning actually had it towed there monday night. I called Wednesday evening they still wasn't sure the "issue". Thursday I wait until about 1pm spoke with John he said well we are pretty sure you need a new engine the mechanic is checking a few more things the car has no pressure. About a hr later I get a email and a call saying the timing chain skipped and something about the pistons and the valves and I need a new engine . John called me and said well.Ill tell you what we will offer you a brand new Engine for the same price as a rebuild plus you get 3yrs 300 thousand warranty for 10,944. Give or take a few dollars. We'll first I paid like 15,500 for the car that I just litetally paid off like Jan 12026. I really feel like had GMC Made buyers aware that the vehicle has defective parts/engines buyers could replace parts or GMC should be held accountable. I started googling the engine and found out that there is a class action lawsuit and a recall on " certain" 2017 terrains depending on the vin. Same issues my car is having but its saying my car has no recall.

NHTSA ID

11719289

Incident

Feb 10, 2026

Rear main seal blow out

NHTSA ID

11715861

Incident

Jan 28, 2026

Traveling on the expressway, engine made wearing noise, reduced engine power and complete engine failure while driving. Rear main seal blowout due to a defective PCV system freezing. It is a known issue for GM2.4L engine especially in cold weather leading to massive oil loss and catastrophic engine damage. This has been confirmed by a GM authorized dealer.

NHTSA ID

11715695

Incident

Jan 19, 2026

On January 31, 2026, while driving on the highway, my 2017 GMC Terrain suddenly began shaking as if it was going to stall. Thankfully, I managed to exit the interstate before the vehicle lost power. Luckily, when this happened, it "only" blocked traffic on a side road. The Terrain was towed to my garage. The mechanic called to inform me that the vehicle was out of oil -even though it was not due for servicing, nor did a “check oil" warning appear. He noted that this was not the first time he had seen this problem occur with this particular make and model: the PCV valve had frozen due to recent cold weather, which led to the rear main seal fracturing, causing oil leaking. In addition, the manifold had also cracked. He explained that repairs would be costly given the labor needed to remove the transmission and perform other related tasks. He recommended that I "Google" the problem to gain an understanding of the time involved to complete this repair. My research corroborated that this was a very labor-intensive undertaking. More concerning was discovering an abundance of cases documenting this failure -as well as class action lawsuits- which underscores the fact that GM knows about this issue but refuses to address it. I am not sure why there hasn't been a recall—though perhaps that's a question for people much smarter than I am. Now, after spending thousands of dollars, I have a vehicle with an oil life monitoring system that doesn't function as intended—and worse, I know this could happen again.

NHTSA ID

11715646

Incident

Jan 31, 2026

PI to help diagnose A/C concern

This document provides the technician with a diagnostic tip if the vehicle stalls and set diagnostic trouble code P0191 and may also set P0172. The diagnostic tip has the technician inspect the high pressure fuel pump body markings to confirm it is an original manufacture part. If it is not an original manufacture part, they should install one and evaluate the vehicle.

This preliminary information communicates information about how to determine if a wheel and tires size change is available.

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.