AutoUtility currently tracks 34 official NHTSA owner defect complaints for the 2021 GMC Terrain. Brakes & Traction Control issues are the most frequently reported category, appearing in 8 complaints (23.5% of submitted records). Among these NHTSA complaint records, 4 filings cite a crash, 4 report one or more injuries.
Factual proportion of owner complaints categorized by automotive subsystem in NHTSA records
8 owner complaints submitted to NHTSA ODI for this subsystem.
8 owner complaints submitted to NHTSA ODI for this subsystem.
7 owner complaints submitted to NHTSA ODI for this subsystem.
6 owner complaints submitted to NHTSA ODI for this subsystem.
Representative defect filings submitted by owners to the NHTSA Office of Defects Investigation
"Vacuum pump failure caused my brakes to lock up and almost caused me to wreck into another vehicle"
"Formal Safety Complaint – 2021 GMC Terrain Brake Failure Vehicle: 2021 GMC Terrain Incident Location: Garden State Parkway (NJ) Speed: Approximately 65 mph Incident Description While driving northbound at highway speed, I attempted to change lanes and apply my brakes. When I pressed the brake..."
"Driving on the Garden state parkway on Sunday night June 28, 2026 I proceed to cross over the ratitan bridge. There was traffic as I was going down the bridge at 70 miles an hour. When I applied the brakes the car would not stop. I had two 6 years old in the backseat. I applied 2 feet to the brake..."
"Automatic transmission solenoid control valve body got stuck open and ruined the whole transmission. This has been a reoccurring problem with these vehicles. Image is from a code read. Issue was confirmed by Gastorf Chevrolet, and an independent transmission shop."
"Vehicle went into reduce engine power mode and check engine light came on. Vehicle has just over 60,000 miles. Code is telling me I need a new turbo and being quoted 1,500-3,000. I have read so many people having the same issue with needing a new turbo just after 60,000 miles"
Reported defect complaint volume across sibling model years (2015–2026)
| Model Year | NHTSA Complaints | Crash Reports | Safety Recalls | Detailed Report |
|---|---|---|---|---|
| 2015 GMC Terrain | 315 | 10 | 3 | View 2015 Problems → |
| 2016 GMC Terrain | 152 | 9 | 2 | View 2016 Problems → |
| 2017 GMC Terrain | 133 | 11 | 1 | View 2017 Problems → |
| 2018 GMC Terrain | 218 | 14 | 5 | View 2018 Problems → |
| 2019 GMC Terrain | 181 | 7 | 3 | View 2019 Problems → |
| 2020 GMC Terrain | 192 | 7 | 2 | View 2020 Problems → |
| 2021 GMC Terrain Current Page | 34 | 4 | 2 | Current |
| 2022 GMC Terrain | 81 | 0 | 2 | View 2022 Problems → |
| 2023 GMC Terrain | 37 | 2 | 2 | View 2023 Problems → |
| 2024 GMC Terrain | 48 | 1 | 1 | View 2024 Problems → |
| 2025 GMC Terrain | 12 | 2 | 0 | View 2025 Problems → |
| 2026 GMC Terrain | 0 | 0 | 1 | View 2026 Problems → |
Complete distribution of consumer defect reports across all 21 granular NHTSA system and subsystem classifications
| Vehicle Component / System | Total Complaints | Crash Reports | Fire Reports | Injury Entries | Fatality Entries |
|---|---|---|---|---|---|
| Service Brakes NHTSA category: SERVICE BRAKES | 6 | 2 | 0 | 2 | 0 |
| Powertrain NHTSA category: POWER TRAIN | 5 | 0 | 0 | 0 | 0 |
| Other / Uncategorized NHTSA category: UNKNOWN OR OTHER | 3 | 0 | 0 | 0 | 0 |
| Electrical System NHTSA category: ELECTRICAL SYSTEM | 2 | 0 | 0 | 0 | 0 |
| Engine NHTSA category: ENGINE | 2 | 0 | 0 | 0 | 0 |
| Air Bags NHTSA category: AIR BAGS | 1 | 1 | 0 | 1 | 0 |
| CHILD SEAT | 1 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,ENGINE,FUEL/PROPULSION SYSTEM | 1 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,FORWARD COLLISION AVOIDANCE | 1 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,SERVICE BRAKES | 1 | 0 | 0 | 0 | 0 |
| ENGINE,ENGINE AND ENGINE COOLING | 1 | 0 | 0 | 0 | 0 |
| ENGINE,FUEL/PROPULSION SYSTEM,LANE DEPARTURE | 1 | 0 | 0 | 0 | 0 |
| Forward Collision Avoidance NHTSA category: FORWARD COLLISION AVOIDANCE | 1 | 0 | 0 | 1 | 0 |
| Fuel System NHTSA category: FUEL SYSTEM, GASOLINE | 1 | 0 | 0 | 0 | 0 |
| FUEL SYSTEM, GASOLINE,ENGINE | 1 | 0 | 0 | 0 | 0 |
| POWER TRAIN,ENGINE | 1 | 0 | 0 | 0 | 0 |
| POWER TRAIN,SERVICE BRAKES,ENGINE AND ENGINE COOLING | 1 | 0 | 0 | 0 | 0 |
| STEERING,ELECTRICAL SYSTEM,ENGINE | 1 | 0 | 0 | 0 | 0 |
| SUSPENSION,ELECTRICAL SYSTEM,VISIBILITY/WIPER | 1 | 0 | 0 | 0 | 0 |
| SUSPENSION,POWER TRAIN | 1 | 0 | 0 | 0 | 0 |
| VEHICLE SPEED CONTROL,LANE DEPARTURE,FORWARD COLLISION AVOIDANCE | 1 | 1 | 0 | 0 | 0 |
Cross-reference safety recalls, crash test safety ratings, and EPA fuel economy for this model year
Key performance indicators, EPA fuel economy specs, powertrain variants, and summary ratings.
Official recall campaigns, safety defect descriptions, and manufacturer free remedy instructions.
NHTSA 5-Star NCAP crash test results, driver assistance systems, and rollover resistance ratings.
EPA fuel economy ratings, electric range, and annual energy cost benchmarks.
Direct, deterministic answers synthesized from verified United States government databases for the 2021 GMC Terrain
In official NHTSA consumer records, the most frequently cited issue area for the 2021 GMC Terrain is Brakes & Traction Control, appearing in 8 records (23.5% of submitted filings).
Secondary reported categories include Powertrain & Transmission (8) and Electrical System (7).
AutoUtility does not issue subjective reliability scores or commercial ratings. In official United States government records, NHTSA tracks 34 consumer defect complaints and 2 safety recall campaigns for the 2021 GMC Terrain.
Reviewing documented component complaint distributions, recall remedy notices, and active federal investigations provides an objective, evidence-based view of the vehicle's historical safety and defect record.
Among consumer complaint records on file with NHTSA for the 2021 GMC Terrain, 4 filings cite a crash, 0 cite smoke or fire, and 4 report one or more injuries.
Incident entries represent consumer descriptions at the time of submission to federal authorities and do not establish mechanical causation or legal liability.
The complaint records on this page are retrieved directly from the NHTSA Office of Defects Investigation (ODI) public database under 49 CFR Part 576.
Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.