2021 GMC Terrain problems
Light NHTSA footprint — 34 owner complaints. Either a clean record or thin data; we'll show what's there.
The 2021 GMC Terrain has 34 NHTSA owner complaints on file (U.S. federal records, as of July 2026). The most-reported system is powertrain at 7 complaints, typically surfacing around 57,422 miles (~$2,500 to repair). Source: NHTSA Office of Defects Investigation.
| Model year | Owner complaints | Recalls |
|---|---|---|
| 2018 Terrain | 214 | 1 |
| 2019 Terrain | 177 | 0 |
| 2020 Terrain | 184 | 0 |
| 2021 Terrain (this page) | 34 | 0 |
| 2022 Terrain | 76 | 0 |
| 2023 Terrain | 35 | 0 |
| 2024 Terrain | 48 | 0 |
Solid reliability overall. Common issues are concentrated in a few systems.
Buyable on the data — keep up the usual maintenance and inspect normally.
- No systemic severe-failure pattern in the complaint record
- Reliability score 8.4/10 — above the segment average
Our read of the federal NHTSA complaint and recall record for this exact year and model — not a substitute for a pre-purchase inspection. How we score.
NHTSA crash-test safety ratings 5 / 5 overall
Driver-assist features on the tested model: Electronic stability control: Standard · Forward collision warning: Standard · Lane departure warning: Standard
Source: NHTSA New Car Assessment Program — tested configuration: 2021 GMC Terrain SUV AWD. Stars rate crash protection in NHTSA's tests, not overall reliability — see the owner-complaint data below for what actually goes wrong.
Buying a used 2021 GMC Terrain? Check these first
Here's what this model is known to do — so you can inspect for it, price it in, or make the seller fix it before you sign.
What to inspect on this specific car
- powertrain — 7 owner reports · tends to show around 57,422 mi · ~$2,500 to fix
- brakes — 6 owner reports · ~$450 to fix
- electrical — 5 owner reports · ~$850 to fix
- engine — 4 owner reports · ~$3,100 to fix
⚠ The one to take seriously: brakes is flagged severe on this model . Inspect it closely on a test drive.
Recalls to confirm are done
Run the VIN from the listing — no active recalls on this model right now, but confirm none were opened after this car was built.
Verdict for buyers: 8.4/10 model. The priciest documented failure is engine (~$3,100) — get the seller's service records for it or inspect closely. Otherwise an average-risk used buy at a fair price.
We tell you what this model is known for and what to inspect — a vehicle-history report tells you what this exact car has been through. Smart buyers get both.
See the full pre-purchase inspection checklist →Ask anything about your 2021 GMC Terrain
A noise, a warning light, a repair quote, "should I buy this?" — get an answer grounded in this vehicle's actual NHTSA record, not generic advice.
Answers use this vehicle's NHTSA complaint & recall record — owner-reported and unverified, not a diagnosis. Verify anything safety-critical with a mechanic.
Top trouble spots 4 categories with 3+ complaints
What owners are saying recent NHTSA-filed complaints · verbatim
I dropped my son off at school and he mistakenly took my car keys into school with him, and somehow I was able to drive all the way home, 4.5 miles, with no key in the car and no warning to stating the remote wasn't in the car. The issue with this is if I'd driven further,…
Recently I have noticed that the back brakes squeak and sound like they are grinding when backing up. Also every now and then the information screen will go black for a while then turn back on could be a few seconds or several minutes. 23,900 on car
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.
My 2021 gmc terrain with 6000 miles on odometer. When driving up hill or going around corner transmission shudders so bad that it feels like front tires are coming off. I contacted the dealer and gm and was told there is a tsb for this complaint. GM and dealer acknowledged…
Estimate your repair exposure
Drag to your current mileage. Numbers are derived from this vehicle's complaint history.
Common questions
Is the 2021 GMC Terrain reliable?
Mostly yes. With a reliability score of 8.4 out of 10 based on 34 owner complaints filed with NHTSA, the 2021 GMC Terrain is generally a sound vehicle. The areas to watch are listed in the top problem section above — most are budget items, not deal-breakers.
Should you avoid the 2021 GMC Terrain?
On the NHTSA data, the 2021 GMC Terrain does not need avoiding. Buyable on the data — keep up the usual maintenance and inspect normally. The record behind that call: No systemic severe-failure pattern in the complaint record; Reliability score 8.4/10 — above the segment average. This is our read of the federal complaint and recall data — not a substitute for a pre-purchase inspection.
What should I check before buying a used 2021 GMC Terrain?
Inspect the powertrain first — it's the most-reported issue on this model, with 7 owner complaints filed. Typical failure occurs around 57,422 miles. Average repair cost runs about $2,500 at an independent shop. Also confirm any open recalls have been completed by running the VIN, and ask for service records covering the problem areas listed above.
Is the 2021 GMC Terrain a good used car to buy?
It scores 8.4 out of 10 on our NHTSA-based read of 34 owner complaints. The main thing to watch is powertrain. Typical failure occurs around 57,422 miles. Priced fairly and clean on inspection, it's a reasonable used buy. Our data covers what this model is known for — pair it with a vehicle-history report on the VIN to see what that specific car has been through.
What's the most common problem on the 2021 GMC Terrain?
Based on NHTSA records, the most-reported issue is powertrain, with 7 complaints filed. Typical failure occurs around 57,422 miles. Average repair cost runs about $2,500 at an independent shop.
What's the most expensive thing that goes wrong?
The powertrain is one of the costlier repair items. Average repair cost runs about $2,500 at an independent shop. Typical failure occurs around 57,422 miles. Catching early warning signs can sometimes extend life by 20–30,000 miles.
How do I check if my GMC Terrain has open recalls?
Paste your VIN into the decoder at the top of this page. We pull live from NHTSA, so you'll see exactly which campaigns apply to your vehicle and whether the dealer has logged the fix. Recall repairs are always free regardless of mileage or warranty status.
Is an extended warranty worth it on a 2021 GMC Terrain?
Math is straightforward: a quality service contract runs $1,800–3,500 over 3 years. With 34 complaints on file and the costliest repair averaging $2,500, one major failure more than pays for it. The catch is reading the contract — many providers exclude wear items and require pre-authorization, so cheaper plans are not always better value.