Last updated: 2026-10-10
GMC Terrain vs Kia EV6: Reliability Compared
GMC Terrain
Kia EV6
Reliability favors the GMC Terrain by a wide margin over the KIA EV6. The EV6 draws far more owner complaints per car sold, led by sudden power loss. The Terrain has its own serious brake and engine problems, but they are much rarer.
How Do the GMC Terrain and Kia EV6 Generations Compare?
Verdict
The GMC Terrain is more reliable than the Kia EV6, scoring 73/100 vs 57/100.
Reliability favors the Terrain, and the gap is large. The deciding fact is complaint volume: the EV6 has 48.9 complaints per 10,000 sold, against 4.8 for the Terrain. EV6 owners describe a car that can lose drive power without warning, mostly traced to the ICCU, and repairs that sometimes fail again. The Terrain has more recalls on paper, but far fewer owners reporting trouble. Its standing is good, while the EV6 sits at mixed.
Key Differences
- 1GMC Terrain has 44.1 fewer complaints per 10k sold
- 2GMC Terrain scores 16 points higher in reliability
- 3Kia EV6 has 11 fewer total recalls
Category Scoreboard
GMC Terrain vs Kia EV6: Which Is More Reliable?
| Metric | GMC Terrain | Kia EV6 |
|---|---|---|
| Reliability Score | 73/100 | 57/100 |
| Years Tracked | 9 | 5 |
| Total Recalls | 19 | 8 |
| Complaints per 10k Sold | 4.8 | 48.9 |
| Year Wins | 5 | 0 |
What Are the Common Problems With the GMC Terrain and Kia EV6?
Electrical failure defines the EV6. A pop, warning messages, a crawl near 25 mph, then a dead car, with hazard lights and door locks sometimes lost too. Electrical and power train complaints are mostly the same ICCU story, and electrical carries 3 crash-linked reports. Mechanical trouble defines the Terrain. Brake assist can vanish at highway speed, leaving a rock-hard pedal, and the brake vacuum pump is the usual suspect. That area has 8 crash-linked complaints, the most of any problem on either car. Some pumps break at the camshaft and ruin the engine. Hesitation from a stop is also common.
| Component | GMC Terrain | Kia EV6 |
|---|---|---|
| ELECTRICAL SYSTEM | 0.6Very Low | 28.4High |
| POWER TRAIN | 1Very Low | 7.8Above Avg |
| UNKNOWN OR OTHER | 0.5Very Low | 3.3Average |
| SERVICE BRAKES | 1Very Low | 1.8Low |
| STRUCTURE | —None | 1Very Low |
| ENGINE | 0.4Very Low | 0.4Very Low |
| FUEL/PROPULSION SYSTEM | 0.2Very Low | 0.6Very Low |
| EXTERIOR LIGHTING | —None | 0.8Very Low |
| VEHICLE SPEED CONTROL | 0.1Very Low | 0.6Very Low |
| AIR BAGS | 0.1Very Low | 0.4Very Low |
| STEERING | 0.1Very Low | 0.3Very Low |
| LANE DEPARTURE | —None | 0.4Very Low |
| TIRES | —None | 0.4Very Low |
| FORWARD COLLISION AVOIDANCE | —None | 0.3Very Low |
| FUEL SYSTEM | 0.1Very Low | —None |
| BACK OVER PREVENTION | —None | —None |
| SUSPENSION | —None | —None |
| ELECTRONIC STABILITY CONTROL (ESC) | —None | —None |
| SEATS | —None | —None |
| VISIBILITY/WIPER | —None | —None |
| VISIBILITY | —None | —None |
Complaints per 10,000 units sold, aggregated across all tracked model years from NHTSA owner reports.
How Does GMC Terrain vs Kia EV6 Reliability Compare by Year?
| Year | GMC Terrain | Kia EV6 | Edge |
|---|---|---|---|
| 2026 | 82/1000R / 0C | 58/1000R / 0C | GMC Terrain |
| 2025 | 78/1000R / 8C | 69/1000R / 0C | GMC Terrain |
| 2024 | 77/1001R / 29C | 59/1002R / 38C | GMC Terrain |
| 2023 | 75/1002R / 21C | 52/1003R / 98C | GMC Terrain |
| 2022 | 72/1004R / 65C | 46/1003R / 215C | GMC Terrain |
Best years to cross-shop: The 2024 GMC Terrain scored 77/100 and the 2024 Kia EV6 scored 59/100 — the strongest shared model years that have been on the road for at least two years, where available.
Who Should Buy the GMC Terrain vs the Kia EV6?
GMC Terrain vs Kia EV6: Common Questions
- Is the KIA EV6 more reliable than the GMC Terrain?
- No. The Terrain is clearly more reliable, with a large gap. Owners file about ten times as many complaints per car sold on the EV6. Many EV6 reports describe sudden loss of power tied to the ICCU, while Terrain complaints are spread across brakes, engine and infotainment.
- Which has more recalls, the EV6 or the Terrain?
- The Terrain has more, with 19 recalls across nine model years. The EV6 has 8 across five model years. Recall count alone does not decide reliability here, because EV6 owners report failures that came back after recall software updates.
- What is the biggest problem with the GMC Terrain?
- Brake assist loss is the biggest. The pedal turns rock hard without warning, often blamed on the brake vacuum pump. It has 8 crash-linked complaints. In some cases the pump breaks at the camshaft and ruins the engine, so ask for service records.
- What goes wrong with the KIA EV6 most often?
- Sudden power loss is the main complaint, usually traced to the integrated charge control unit. Owners report a pop, warnings, speed dropping to about 25 mph, then a shutdown. Dead 12V batteries and weeks-long parts waits are also reported.
- Which Terrain model years should I avoid?
- Avoid 2018 and 2019, the weakest years. The 2025 and 2026 years rate strongest, but newer years have had less time to collect complaints. Whatever the year, check whether the brake vacuum pump has been serviced and test for hesitation pulling away from a stop.
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Decided between GMC Terrain and Kia EV6? Run a VIN check before you buy — uncover hidden accidents, title issues, and open recalls.
How we score the GMC Terrain and Kia EV6
Scores weight complaint severity at 35%, repair costs at 30%, recall impact at 20%, and the spread of complaints across systems at 15%, with complaint counts adjusted for US sales. Read the full methodology.
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