2021 GMC Sierra 1500 — should you buy one?

Why people love the 2021 GMC Sierra 1500

The 2021 Sierra 1500 with the 5.3L EcoTec3 V8 and 10-speed automatic feels genuinely quick off the line and holds its composure on the highway without much drama. Owners praise the GMC-specific interior trim—real brushed aluminum and leather on upper trims—which sets it apart from a Chevy Silverado sitting on the same lot. The bed-mounted camera and power rear window became standard that year, solving a real problem for anyone hauling or towing.

Common complaints and known issues

The 10-speed transmission in 2021 models exhibits a known shudder or harsh downshift between 35–45 mph in light throttle conditions; dealers have issued software reflashes, but some owners report the fix doesn't fully resolve it. At 60k–90k miles, the infotainment touchscreen occasionally becomes unresponsive or crashes to a black screen, requiring a full system reboot. Transmission fluid leaks from the pan gasket have cropped up around 80k miles on some examples. NHTSA complaints peak around loss of power steering assist while driving.

Typical asking price

Under 60k miles: $32,000–$38,000. 60k–100k miles: $27,000–$33,000. Over 100k miles: $22,000–$28,000. Crew cab 4WD with the 5.3L commands the higher end; Regular Cab 2WD and higher mileage examples drop $3k–$5k. Clean title, no accident history, and remaining factory warranty add $1k–$2k to asking price in most markets.

Ranges are typical 2026 asking prices, not appraisals. The actual fair offer depends on this specific car's title history, accident record, and open recalls — which is what EstimateProof tells you.