2020 GMC Terrain Reliability ReportCommon Problems, Repair Costs & Expert Verdict
Quick Facts · 2020 GMC Terrain
- Has 2 NHTSA recalls on record — the most notable involves the power train:automatic transmission.
- Scores 4 points below the strongest nearby year — the 2021 GMC Terrain earns a 82.
- The system most likely to surface first: engine (1.5l turbo) (major severity).
Should You Buy the 2020 GMC Terrain?
The 2020 GMC Terrain presents a comfortable and well-appointed compact SUV package, but its reliability narrative is complicated by specific powertrain concerns, particularly with the standard 1.5L turbocharged engine and the 9-speed automatic transmission. While it offers good value and strong aesthetics, potential buyers must exercise caution and conduct thorough pre-purchase inspections to avoid costly repairs down the line.
The 2020 GMC Terrain is a stylish and comfortable compact SUV, but its reliability is significantly hampered by the problematic 1.5L turbo engine and the sometimes-erratic 9-speed transmission. While attractive on paper, prospective buyers must proceed with extreme caution, prioritize comprehensive inspections, and…
Best Model Years
2021-2024 (post-facelift, 2.0L dropped but 1.5L may have minor revisions, fewer powertrain options simplify choice)
Years to Avoid
2018-2020 (early 2nd gen models with initial 1.5L engine and 9-speed transmission quirks)
Biggest Strengths
- Comfortable ride quality
- Stylish exterior design
- Relatively quiet cabin
Top Risk Areas
The systems that tend to fail first on the 2020 GMC Terrain, with the typical mileage window when each becomes a concern. Detailed repair-cost ranges and exact what-to-check inspection notes are in the full report.
The 1.5L turbocharged engine is known for excessive oil consumption, often leading to premature timing chain stretch and potential engine damage if not closely monitored. This can be due to PCV system design flaws.
The 9-speed automatic transmission, particularly when paired with the 1.5L engine, can exhibit harsh shifts, hesitation, and a torque converter shudder. While some issues are addressed with software updates, mechanical failures are not u…
Owners frequently report issues with the infotainment system freezing or lagging, HVAC blend door actuators failing, and various sensor-related warnings (e.g., check engine light, TPMS) that can be difficult to diagnose.
2020 GMC Terrain Mileage Danger Zones
The mileage windows when the 2020 GMC Terrain most commonly needs attention. Plan ahead, budget accordingly, and inspect before you cross each threshold.
Early Checkpoint
At this mileage, ensure all software updates for the transmission and infotainment have been performed. This is also a good time to establish an oil consumption monitoring routine for the 1.5L engine.
Critical Maintenance Zone
This mileage often coincides with major service intervals. Pay close attention to the 1.5L engine's timing chain and PCV system. Consider a proactive transmission fluid change, especially if exhibiting early shudder.
Elevated Risk Zone
Beyond the typical warranty period for many components, major powertrain issues for the 1.5L engine or 9-speed transmission become more likely. Budget for potential significant repairs.
High Risk Zone
Only consider purchasing a Terrain at this mileage with impeccable, documented service history, especially for the 1.5L engine. Be prepared for potential major component replacements across the board.
2020 GMC Terrain Ownership Cost Outlook
What it typically costs to keep the 2020 GMC Terrain on the road. Full 5-year cost-of-ownership projection and major-failure-risk forecast are in the report.
Annual Maintenance
$450-700
Moderate Repairs
$600-1,800 occasionally (e.g., transmission flush/valve body, timing chain guide)
How Long Does the 2020 GMC Terrain Last?
For maximum peace of mind, target a 2020 Terrain with the 2.0L engine and under 50,000 miles with a documented service history. If considering the 1.5L, aim for the lowest mileage possible and factor in the cost of potential future engine work.
What 2020 GMC Terrain Owners Actually Say
What Owners Love
- Comfortable and smooth ride for daily commuting.
- Upscale interior design, especially in Denali trim.
- Good fuel economy from the 1.5L engine when running optimally.
- Quiet cabin at highway speeds.
Common Frustrations
- Perceived lack of power and refinement from the 1.5L engine.
- Frustrating and inconsistent behavior from the 9-speed transmission.
- Infotainment system can be buggy and slow to respond.
- Some interior materials feel cheap in lower trims, prone to scratches.
Who Should Buy the 2020 GMC Terrain?
Best For
- Drivers prioritizing a comfortable ride and quiet cabin over raw performance.
- Small families needing practical cargo space and available AWD.
- Buyers who appreciate GMC's styling and premium feel for the price point.
Not Ideal For
- Long-term ownership seekers demanding bulletproof reliability.
- Drivers sensitive to powertrain quirks, particularly transmission hesitation.
How the 2020 GMC Terrain Compares to Rivals
The Terrain sits in the middle-to-lower end of the compact SUV reliability spectrum, lagging behind the Japanese stalwarts but performing better than some domestic and European rivals, particularly due to its powertrain vulnerabilities.
More Reliable Than
- Ford Escape (certain model years with 1.5L EcoBoost engines)
- Nissan Rogue (older CVT models)
- Jeep Cherokee (early 9-speed transmission issues)
Comparable To
- Chevrolet Equinox (shared platform and powertrains)
- Hyundai Tucson (some engine/transmission issues in earlier models)
NHTSA Recalls
2 recalls on record from NHTSA. Check your VIN atnhtsa.gov to see if the repair was performed.
POWER TRAIN:AUTOMATIC TRANSMISSION
General Motors LLC (GM) is recalling certain 2018-2019 Chevrolet Cruze and Buick LaCrosse, 2018-2020 Chevrolet Equinox, Chevrolet Traverse and GMC Terrain, 2018 Chevrolet Malibu, 2019-2020 Buick Encore, Buick Enclave, Cadillac XT4, Chevrolet Blazer and GMC Acadia, and 2020 Cadillac XT6 vehicles. The start/stop accumulator endcap may have missing bolts.
CHILD SEAT:VEHICLE LATCH ANCHOR
General Motors, LLC (GM) is recalling certain 2020-2023 Chevrolet Equinox and GMC Terrain vehicles. The four rear-seat lower child seat LATCH anchorage bars may have excessive powder coating, which could prevent a child seat from being installed with the anchorage bars. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 225, "Child Restraint Anchorage Systems."
What breaks on the 2020 GMC Terrain?
Full reliability breakdown — engine, transmission, rust, electrical. With repair costs and mileage danger zones.
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GMC Terrain by Year
Compare KeepScores across nearby years of the GMC Terrain. Click any year for its full report.
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Frequently Asked Questions
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