2021 GMC TERRAIN Problems
Real NHTSA owner complaints for the 2021 Gmc Terrain. This model year has 31 NHTSA complaints — top issue: Engine Problems.
Model-Year Complaints
31 owner reports
Recall Campaigns
2 NHTSA campaigns
Top Failure Area
Engine Problems
Worst 2021 Gmc Terrain Problems
Top 3 most-reported issues with average mileage at failure.
Engine Problems
Transmission / Drivetrain
Electrical Faults
AI Interpretation — 2021 Gmc Terrain
Low ConfidenceBased on 31 NHTSA complaints for the 2021 GMC Terrain, issues are concentrated in the engine, transmission/drivetrain, and electrical systems. There are 2 recalls and 4 crash-related complaints, but the low confidence level suggests caution in interpretation.
- Engine problems account for the highest number of complaints (10).
- Transmission/drivetrain issues are the second most reported (8).
- Electrical faults are also notable (7 complaints).
- Engine Problems
- Transmission / Drivetrain
- Electrical Faults
- Inspect the engine for reported issues such as stalling or loss of power.
- Verify all open recalls at nhtsa.gov/recalls.
- Request service records for transmission and electrical repairs.
- Have a mechanic inspect the vehicle before purchase.
Considering a 2021 Gmc Terrain?
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All Problems by Category
Every NHTSA complaint category for the 2021 Gmc Terrain. A single complaint may appear in multiple categories.
| Component | Complaints | Crashes | Fires | Avg Mileage | Volume |
|---|---|---|---|---|---|
| Engine Problems | 10 | — | — | — | |
| Transmission / Drivetrain | 8 | — | — | — | |
| Electrical Faults | 7 | — | — | — | |
| Brake System | 5 | 2 | — | — | |
| Uncategorized Issues | 3 | — | — | — | |
| Forward Collision Avoidance: AEB | 3 | 1 | — | — | |
| Fuel/Propulsion System | 2 | — | — | — | |
| Lane Departure | 2 | 1 | — | — | |
| Suspension Failures | 2 | — | — | — | |
| Fuel System | 2 | — | — | — | |
| Gasoline | 2 | — | — | — | |
| Child Seat | 1 | — | — | — | |
| Steering Defects | 1 | — | — | — | |
| Airbag Malfunctions | 1 | 1 | — | — | |
| Unintended Acceleration | 1 | 1 | — | — | |
| Visibility/Wiper | 1 | — | — | — |
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 2021 Gmc Terrain. Type a keyword (e.g. “transmission”, “stalling”, “brakes”) to filter.
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.
The contact owns a 2021 GMC Terrain. The contact stated that while driving at various speeds, the vehicle hesitated while depressing the accelerator pedal, with a misfire coming from the engine. During the failure, the message "Engine Power Reduced" was displayed on the instrumen…
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
The engine light came on while driving, saying “engine power reduced”. It barely accelerates, RPMs go over 5, it chugs when driving. Taken to an independent service center.
around chirstmas, Was driving on the highway and the car threw a "reduced engine power" warning and went into limp mode. Check engine light came on. Car asymptomatic prior. got the code pulled and it said turbocharger under boost. The next day the check engine light went out and …
The contact owns a 2021 GMC Terrain. The contact received notification of NHTSA Campaign Number: 23V339000 (Child Seat); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall rep…
The contact owns a 2021 GMC Terrain. The contact stated that the transmission was previously replaced. The contact stated that upon starting the vehicle, the check engine warning light illuminated. The failure had occurred intermittently. Additionally, the contact stated that whi…
Constantly have water leaking into spare tire compartment, back seat floors and passenger floor. Mold/mildew smell coming through vents. Have had drains lines cleaned out, and still recurring having this issue. Unknown where leak is coming from. This is a serious health risk.
Driving my vehicle with no warnings, messages, or symptoms on adaptive cruise control Sunday [XXX] on [XXX] in Michigan. I changed lanes into the right lane when the vehicle abruptly, without notification, and with force, caused braking that unexpectedly and dangerously slowed th…
First time I had problems with my 2021 Terrain I took it to victory GMC on 9/20/24. At the it had 45,000 miles. Every time I would drive and accelerate it would shake extremely bad in the floorboard. There was also transmission fluid leaking. I picked the car up on 9/27/2024 and …
Drive shaft on my GMC Terrain needs to be repaired according to my repair shop. I brought it in as it was vibrating on acceleration and other times frequently. I was told it was the “drive shaft” and the mechanic states they have had Equinox and GMC Terrains coming in for same is…
The contact owns a 2021 GMC Terrain. The contact stated while driving at various speeds, the transmission erroneously shifted to the neutral, causing the vehicle to decelerate. After restarting the vehicle, the vehicle operated normally. During the failure, the message " Power Re…
The contact owns a 2021 GMC Terrain. The contact stated while driving 5 MPH, the vehicle stalled. There was no warning light illuminated. The contact stated that the failure was like GM Product Safety Recall: N222372310 (Inadequate Fuel Pump Flow). The vehicle was towed to an ind…
I purchased the car August 2024, I have had it for 4 months and while driving down the road a large fuel tank pops up stating low fuel and the car comes to an abrupt stop.The 3x the gas tank was never low. Parking brake comes on and car doesn't not move. All lights on dash come o…
The contact owned a 2021 GMC Terrain. The contact stated while the brake pedal was depressed, it was released and the vehicle suddenly accelerated aggressively. The contact attempted to avoid crashing into the vehicle in front and swerved however the front of the vehicle still im…
When car has been unused for a period of time, the right rear brake makes noise when the car is moved. This happend in either forward or reverse. Even after driving for a short period of time, the noise is still evident. Under warrenty, I asked the dealership to resolve. They ind…
The car has revved high rpm's since purchase, with multiple attempts to get it resolved . Since then, the steering wheel has jerked out of my hand's multiple times, unexpecting, causing the car to jerk while being stopped. The car has also not budged in the middle of traffic whil…
I was in a in a 70 miles an hour highway accident and was hit in front driver side door, went up embankment and hit a tree then rolled backwards onto the highway. No airbags deployed.
When accelerating from a stop between 35-45 mph the steering wheel shakes and you feel a vibration coming from the front wheels. I thought the wheels were loose and were about to come off.
The contact owns a 2021 GMC Terrain. The contact stated upon pressing the Push to Start button, the vehicle failed to start after several attempts, and the battery drained. The vehicle was towed to the dealer, but the failure could not be duplicated. The contact stated that the v…
Source: NHTSA Complaints Database. Real owner reports for the 2021 Gmc Terrain.
Recalls for 2021 Gmc Terrain
2 campaignsNHTSA recall campaigns for the 2021 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.
2021 Gmc Terrain — FAQ
Answers based on real NHTSA complaint and recall data for this specific model year.
Is the 2021 Gmc Terrain reliable?▾
Severe Issues. The 2021 Gmc Terrain has 31 NHTSA owner complaints, 4 crash-related, and 2 recall campaigns. The most reported issue is Engine Problems (10 complaints). Source: NHTSA via VinSpector AI.
What are the most common problems with the 2021 Gmc Terrain?▾
#1: Engine Problems (10 complaints). #2: Transmission / Drivetrain (8 complaints). #3: Electrical Faults (7 complaints)
At what mileage do problems start on the 2021 Gmc Terrain?▾
Mileage data is not available or insufficient for this model year.
How safe is the 2021 Gmc Terrain?▾
The 2021 Gmc Terrain has 4 crash-related complaints and 0 fire reports out of 31 total NHTSA complaints. 4 injuries were reported. For NCAP lab crash test star ratings, visit nhtsa.gov/ratings.
Does the 2021 Gmc Terrain have any recalls?▾
Yes — 2 NHTSA recall campaigns affect the 2021 Gmc Terrain. The largest issue: TIRES. Check nhtsa.gov/recalls or run a VIN check to see if your specific vehicle has open recalls.
Should I buy a 2021 Gmc Terrain?▾
The 2021 Gmc Terrain has severe issues — review the top problems before buying. Pay particular attention to Engine Problems 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 2021 Gmc Terrain
Real owner complaints tell you about the model. The VIN tells you about your specific car — accidents, title issues, odometer fraud. Full report just $12.95 (vs. Carfax $39.99).