2018 GMC Terrain problems and complaints
Owners have filed 226 complaints with NHTSA about the 2018 GMC Terrain. The most-reported areas: Service Brakes (84), Engine (55), Power Train (42).
Key takeaways
- 226 owner complaints on file with NHTSA.
- 14 involve a crash, 1 a fire, 12 reported injuries.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Service Brakes | 84 | 37% |
| Engine | 55 | 24% |
| Power Train | 42 | 19% |
| Unknown Or Other | 35 | 15% |
| Electrical System | 35 | 15% |
| Air Bags | 14 | 6% |
| Hydraulic | 13 | 6% |
| Fuel/Propulsion System | 12 | 5% |
| Forward Collision Avoidance | 8 | 4% |
| Vehicle Speed Control | 8 | 4% |
| Steering | 7 | 3% |
| Electronic Stability Control (esc) | 7 | 3% |
One complaint can name several components, so shares add up to more than 100%.
Parts for the 2018 GMC Terrain
GarageDex's verified specs for this car. Each Buy button searches Amazon for that exact part.
- Battery
- Engine oil
- Oil filter
- Engine air filter
- Cabin air filter
- Wiper blades
- Headlight bulb
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| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2018 GMC Terrain SUV FWD Later Release | 5/5 | 5/5 | 5/5 | 4/5 |
| 2018 GMC Terrain SUV AWD Later Release | 5/5 | 5/5 | 5/5 | 4/5 |
| 2018 GMC Terrain SUV AWD Early Release | 4/5 | 5/5 | 4/5 | 4/5 |
| 2018 GMC Terrain SUV FWD Early Release | 4/5 | 5/5 | 4/5 | 4/5 |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Fuel System, Gasoline - filed 2026-10-22
The contact owns a 2018 GMC Terrain. The contact stated that while driving, the vehicle unexpectedly stopped. The contact exited the vehicle and there was an abnormally strong gasoline odor coming from the rear of the vehicle. The vehicle was towed and the tow truck operator stated that there was gasoline leaking under...
Power Train - filed 2026-10-20
This car was my daily driver to work it's been serviced regularly and well maintained, in XXX I've had the car for 8 years and driving home from work on the [XXX] it started to Rev very high and I wasn't able to speed up past 55 so I got in the slow lane and the car was not shifting gears and the transmission light cam...
Service Brakes,engine - filed 2026-10-14
On XXX while driving my 2018 GMC Terrain SLE 1.5L turbo on the highway at approximately 70 MPH near [XXX]. I experienced a sudden loss of power brake assist without any prior dashboard warning lights or messages. I was traveling with children to [XXX] for a youth wrestling tournament, approximately 5 hours from my resi...
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More for the 2018 GMC Terrain
Complaints are reports filed by owners with the National Highway Traffic Safety Administration. NHTSA publishes them without verifying them, and counts rise with how many cars were sold, so compare years of the same model rather than different models. Crash ratings are NHTSA's own 5-Star Safety Ratings results.