2026 GMC Terrain problems and complaints
Owners have filed 34 complaints with NHTSA about the 2026 GMC Terrain. The most-reported areas: Unknown Or Other (9), Power Train (6), Forward Collision Avoidance (6).
Key takeaways
- 34 owner complaints on file with NHTSA.
- 1 involve a crash, 2 a fire, 1 reported injury.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Unknown Or Other | 9 | 26% |
| Power Train | 6 | 18% |
| Forward Collision Avoidance | 6 | 18% |
| Electrical System | 5 | 15% |
| Suspension | 5 | 15% |
| Service Brakes | 4 | 12% |
| Wheels | 4 | 12% |
| Steering | 3 | 9% |
| Lane Departure | 2 | 6% |
| Structure | 2 | 6% |
| Vehicle Speed Control | 1 | 3% |
| Latches/Locks/Linkages | 1 | 3% |
One complaint can name several components, so shares add up to more than 100%.
Parts for the 2026 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
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| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2026 GMC TERRAIN SUV N/A AWD | 5/5 | 4/5 | 5/5 | 4/5 |
| 2026 GMC TERRAIN SUV N/A FWD | 5/5 | 4/5 | 5/5 | 4/5 |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Power Train - filed 2026-11-04
I was at a stop light with auto start stop enabled and when I went to drive again I felt a sudden jolt and car immediately shifted to park while on a main road I was unable to shift until I shut the car off opened the door and restarted it the. Drove like normal but a check engine light appeared and a fault was sent to...
Forward Collision Avoidance - filed 2026-09-23
On the evening ofXXX, at approximately 6:00 PM, I was driving this Avis rental vehicle on a highway in [XXX] at normal highway speed, below the posted limit, with my foot on the accelerator. The forward collision warning and automatic emergency braking system activated and applied the brakes hard. There was no vehicle,...
Electrical System,vehicle Speed Control,lane Departure - filed 2026-09-21
a failing telematics module on your 2026 GMC Terrain is causing network corruption, leading to an erratic speedometer and loss of driver assistance systems while driving.
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More for the 2026 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.