2018 GMC TERRAIN Problems
Real NHTSA owner complaints for the 2018 Gmc Terrain. This model year has 208 NHTSA complaints β top issue: Brake System.
Model-Year Complaints
208 owner reports
Recall Campaigns
5 NHTSA campaigns
Top Failure Area
Brake System
Worst 2018 Gmc Terrain Problems
Top 3 most-reported issues with average mileage at failure.
Brake System
Engine Problems
Transmission / Drivetrain
AI Interpretation β 2018 Gmc Terrain
Low ConfidenceComplaints for the 2018 GMC Terrain are concentrated in the brake system, engine, and transmission/drivetrain. A recurring theme appears to be brake-related issues, which account for the largest share of reports. Crash-related complaints are relatively few, but overall confidence is low due to limited data.
- Brake system complaints are the most numerous, with 72 reports.
- Engine problems are the second most common, with 50 complaints.
- Transmission/drivetrain issues total 41 complaints.
- Brake System
- Engine Problems
- Transmission / Drivetrain
- Inspect brake system thoroughly before purchase.
- Verify all open recalls at nhtsa.gov/recalls.
- Request service records for engine and transmission repairs.
- Have a mechanic inspect the vehicle before purchase.
Considering a 2018 Gmc Terrain?
This page shows the model year's reputation. The VIN tells you about this specific car β accidents, title issues, odometer fraud. Full report just $12.95 (vs. Carfax $39.99).
All Problems by Category
Every NHTSA complaint category for the 2018 Gmc Terrain. A single complaint may appear in multiple categories.
| Component | Complaints | Crashes | Fires | Avg Mileage | Volume |
|---|---|---|---|---|---|
| Brake System | 72 | 2 | β | β | |
| Engine Problems | 50 | β | 1 | β | |
| Transmission / Drivetrain | 41 | 2 | β | β | |
| Electrical Faults | 35 | 1 | 1 | β | |
| Uncategorized Issues | 33 | 1 | β | β | |
| Airbag Malfunctions | 14 | 7 | β | β | |
| Fuel/Propulsion System | 11 | 2 | β | β | |
| Hydraulic | 9 | β | β | β | |
| Unintended Acceleration | 8 | 1 | β | β | |
| Forward Collision Avoidance: AEB | 7 | 1 | β | β | |
| Electronic Stability Control (Esc) | 7 | β | β | β | |
| Steering Defects | 6 | 2 | β | β | |
| Visibility/Wiper | 4 | β | β | β | |
| Seat Belt Issues | 3 | 1 | β | β | |
| Structural Problems | 3 | 1 | β | β | |
| Fuel System | 3 | β | β | β | |
| Seat-Related Issues | 3 | β | β | β | |
| Lane Departure | 2 | β | β | β | |
| Diesel | 2 | β | β | β | |
| Suspension Failures | 2 | 1 | β | β | |
| Wheel Issues | 2 | β | β | β | |
| Door Lock Issues | 1 | β | β | β | |
| Air | 1 | β | β | β | |
| Gasoline | 1 | β | β | β | |
| Tire Issues | 1 | β | β | β | |
| Headlight/Taillight Failures | 1 | β | β | β | |
| Back Over Prevention | 1 | β | β | β | |
| Visibility | 1 | β | β | β |
Source: NHTSA Complaints Database. Complaint counts may exceed total complaints because one report can span multiple categories.
Search Owner Complaints
Read what owners actually reported to NHTSA for the 2018 Gmc Terrain. Type a keyword (e.g. βtransmissionβ, βstallingβ, βbrakesβ) to filter.
We just got off the bus thruway and my brakes pedal got hard to press and it was hard to stop car I had to push on brake dry hard to get the car to stop it was jarring and o had to get my some and o to a safe place. Garage said itβs brake assist and he researched thereβs is an aβ¦
My car was t-boned on the driver side and no airbags deployed. The outer door and window exploded with the force. We were also hit from behind
The control knob that controls AWD, 2WD,Off-road, and 4 x4 AWD. Just stopped working. Stuck on 2WD mode. I did have it checked for any codes, even though, there is NO check engine light is on.
The contact owns a 2018 GMC Terrain. While attempting to shift to reverse(R) out of a parking spot, the message βTransmission Unable to Shiftβ was displayed on the instrument panel, and the transmission was unable to shift into reverse(R). The contact called for tow truck assistaβ¦
Faulty Brake Vacuum Pump!!!! 2018 GMC Terrain @ 119254 miles--- NO warning! Brakes were hard to press, did not work and I rolled into ditch to prevent an accident. I see hundreds of people with same issue now that I Am having to research. This was very scary. I was told it was aβ¦
Vehicle will not shift out of park, despite replacing the valve body, putting in a new battery, and transmission fluid. It has been this way since mid January. The codes donβt make sense and there is no current recall, nor have we had this vehicle for very long. It has 48,000 milβ¦
Brakes were hard to engage or press when stopping due to Vacuum pump stop working. Had to replace the vacuum pump
The contact owns a 2018 GMC Terrain. The contact stated that while driving at various speeds, there was an abnormal grinding sound coming from the vehicle while transitioning to 4WD. The contact continued driving and the driving sound became more frequent while shifting into 4WD.β¦
Turbo boost went out in my vehicle and 3 others with the same engine, different makes/models. Vehicles were serviced at Grayling Car Care 4430 M-72, Grayling, MI 49738 (989) 348-3200. Significant power loss, sluggish acceleration, poor fuel economy, and often strange noises (whinβ¦
Vacuum pump failure resulting in crankshaft sensor to completely sheer off.
The infotainment system will just randomly start going haywire and when it happens, you cannot use the touchscreen. It will try to randomly delete app icons such as the camera, it will try to delete connected phones, it will try to delete radio favorites and it will move app iconβ¦
The contact owns a 2018 GMC Terrain. The contact stated that while driving approximately 30 MPH, the brake pedal became extremely difficult to depress, with the message "Brake Assist" displayed. The vehicle was driven to the shoulder of the roadway and the parking brake was activβ¦
The contact owns a 2018 GMC Terrain. The contact stated that while driving at an undisclosed speed, the vehicle shuddered and failed to come to a stop while the brake pedal was depressed. The check engine warning light was illuminated. The vehicle was taken to a local independentβ¦
The contact owns a 2018 GMC Terrain. The contact stated that the transmission was shifting gear erratically. The contact stated that the doors were locking and unlocking independently, and the instrument cluster was blank. There was an abnormal beeping sound coming from the vehicβ¦
My car said to me this not that there is something wrong with the Service Safety Restraint system! It was fine last night when I got home! I just bought this car a month ago and everything was fine and now my air bag light is on and will not go off!
The contact owns a 2018 GMC Terrain. The contact stated while driving at an undisclosed speed, the air bag and ABS warning lights illuminated. The vehicle was taken to Auto Zone to be diagnosed. The vehicle was diagnosed with air bag failure. The contact was informed that the airβ¦
The contact owns a 2018 GMC Terrain. The contact stated that while driving at an undisclosed speed, the unintendedly decelerated and failed to properly accelerate. The vehicle was taken to the local dealer, who diagnosed the vehicle with transmission failure. The contact was infoβ¦
April 2025, Vacuum Pump went out meaning lost breaks going 60 miles per hour down the road after engine light came on. Left me and two children stranded 2 hours from home with no way to get back except a tow. Now September 2025 Cam Shafts are out as well as Vacuum Pump. Stranded β¦
The contact owns a 2018 GMC Terrain. The contact stated that on several occasions while driving at various speeds, the infotainment system screen and radio inadvertently switched stations from AM to FM. On other occasions, while driving and using the GPS system, the screen went bβ¦
It starts to βwarnβ you by the seat doing whatever it does and the dash lights up collision flashing and slams on the brakes when nothing is even around
Source: NHTSA Complaints Database. Real owner reports for the 2018 Gmc Terrain.
Recalls for 2018 Gmc Terrain
5 campaignsNHTSA recall campaigns for the 2018 Gmc Terrain. Recalls are free to fix at any authorized dealer. Run a VIN check below to see if your specific vehicle has open recalls.
2018 Gmc Terrain β FAQ
Answers based on real NHTSA complaint and recall data for this specific model year.
Is the 2018 Gmc Terrain reliable?βΎ
Severe Issues. The 2018 Gmc Terrain has 208 NHTSA owner complaints, 14 crash-related, and 5 recall campaigns. The most reported issue is Brake System (72 complaints). Source: NHTSA via VinSpector AI.
What are the most common problems with the 2018 Gmc Terrain?βΎ
#1: Brake System (72 complaints). #2: Engine Problems (50 complaints). #3: Transmission / Drivetrain (41 complaints)
At what mileage do problems start on the 2018 Gmc Terrain?βΎ
Mileage data is not available or insufficient for this model year.
How safe is the 2018 Gmc Terrain?βΎ
The 2018 Gmc Terrain has 14 crash-related complaints and 1 fire reports out of 208 total NHTSA complaints. 12 injuries were reported. For NCAP lab crash test star ratings, visit nhtsa.gov/ratings.
Does the 2018 Gmc Terrain have any recalls?βΎ
Yes β 5 NHTSA recall campaigns affect the 2018 Gmc Terrain. The largest issue: AIR BAGS: AIR BAG/RESTRAINT CONTROL MODULE. Check nhtsa.gov/recalls or run a VIN check to see if your specific vehicle has open recalls.
Should I buy a 2018 Gmc Terrain?βΎ
The 2018 Gmc Terrain has severe issues β review the top problems before buying. Pay particular attention to Brake System issues. Always run a VIN check on the specific car you're considering to check for accident history, open recalls, and title brands.
Source: NHTSA (National Highway Traffic Safety Administration) complaint and recall databases, aggregated by VinSpector AI.
Wider context: See the full Gmc Terrain reliability report with year-by-year comparison.
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Check Your Specific 2018 Gmc Terrain
Real owner complaints tell you about the model. The VIN tells you about your specific car β accidents, title issues, odometer fraud. Full report just $12.95 (vs. Carfax $39.99).