The complaint file collapses to 34 — but the brake pump is still in it, and GM's bulletin still names this year.

Four of this year's complaints describe the 1.5T losing power, and the mileages cluster low. One owner just past 60,000 miles was told the car needed a new turbocharger and quoted 1,500 to 3,000 dollars for it. Another had the car throw a reduced-power warning and enter limp mode twice in highway traffic, with a shop finding oil leaking from the turbo inside and out. Cold weather is implicated: GM's bulletin 10231622, covering 2018 to 2021, describes fault codes P0299 and P0234 set by moisture and oil condensate freezing inside the turbo wastegate solenoid, and a separate Service Update covers ice building up in the charge air cooler and crankcase ventilation below roughly 0°F. There is no recall and no free program for the turbo itself. Any reduced-power message in the history needs a scan.

A small but real cluster. One owner reports the automatic transmission's solenoid control valve body sticking open and, in their words, ruining the whole transmission, confirmed by both a Chevrolet dealer and an independent transmission shop. Another had the transmission fail outright and need replacing at around 45,000 miles. Several more describe a shudder on acceleration between roughly 35 and 60 mph — strong enough that two separate owners thought the front wheels were coming loose — and both were told by GM dealers that a service bulletin existed but no fix was available. GM's Service Update 10187228 covers 2020 and 2021 cars whose clutch spring retaining ring is not fully seated, setting fault code P0747, and that repair is free if the car qualifies. Accelerate hard from a standstill several times on the test drive.

This recall covers the four lower child-seat anchor bars in the back seat, which left the factory with too much powder coating on them — thick enough that a child seat cannot be clipped on. GM's interim advice is to fit child seats using the seat belts instead. It is a free inspection and refinish, but one 2021 Terrain owner in the federal file reports being told the part was unavailable and that the dealer would not even inspect the car, more than two years after notification letters went out in June 2023. If you carry children, physically clip a child seat onto the lower anchors before you buy rather than trusting the recall status alone.

Worth stating plainly, because the earlier years in this run are heavy going. The 34 complaints on the 2021 are a fifth of the 2020 total, and no single failure dominates the file the way the brake pump dominates 2018 through 2020. The heavy launch-year recall load is gone: the driveshaft, airbag-module, fuel-pump-flange and brake-caliper campaigns all belong to the 2018 and 2019 cars, and the start-stop accumulator recall stops at 2020. An independent dealer recorded at the end of 2023 sums up the second-generation cars this way: no major engine or transmission problems, nothing he would warn a buyer about beyond the vacuum pump. Check that one thing and this is a straightforward used crossover.