Used 2021 GMC Sierra 1500 for Sale near Decatur, IL

## Summary - With 6,810 currently listed for sale and an **average price of $35,798.00**, 33.8% of 2021 GMC Sierras for sale on CarGurus are rated as good or great deals. - **Favorably reviewed:** Owners rated the 2021 GMC Sierra 1500 4.87 / 5 stars. - **79.6% of 2021 Sierra models on CarGurus are accident-free**. - The 2021 GMC Sierra 1500 offers exceptional engine performance, advanced technology, and interior comfort, along with multiple powertrain options, and features a luxurious Denali trim level that enhances its appeal. ## Why it stands out The 2021 GMC Sierra 1500 stands out in the crowded full-size pickup truck market due to its blend of luxury, performance, and versatility. As the "professional grade" option from General Motors, the Sierra offers features that cater to both utility and comfort, making it an attractive choice for various buyers. The optional Duramax 3.0-liter turbodiesel engine provides impressive torque and fuel efficiency, positioning it as a cost-effective alternative in the diesel truck segment. Moreover, the Sierra’s upscale Denali trim level offers a luxurious experience, complete with a range of advanced technology and comfort features. Although some users have noted the interior materials feeling less premium than expected, the overall design and functionality have received praise, particularly for its user-friendly technology. Coupled with its good safety features and multiple body styles, the Sierra remains a solid contender for those in the market for a full-size pickup. ## Other model years to consider - **[2025 GMC Sierra 1500](https://www.cargurus.com/Cars/l-Used-2025-GMC-Sierra-1500-c33540)** - Average price: $53,167.00 - Good/great deal percentage: 34.2% - User rating: 5 / 5 - Total listings: 7,158 - **[2020 GMC Sierra 1500](https://www.cargurus.com/Cars/l-Used-2020-GMC-Sierra-1500-c29270)** - Average price: $33,935.00 - Good/great deal percentage: 34.1% - User rating: 4.65 / 5 - Total listings: 6,516 - **[2022 GMC Sierra 1500](https://www.cargurus.com/Cars/l-Used-2022-GMC-Sierra-1500-c31916)** - Average price: $43,272.00 - Good/great deal percentage: 33.9% - User rating: 4.65 / 5 - Total listings: 8,601 This analysis is based on CarGurus' proprietary market data from March 16, 2026, CarGurus experts' opinions, and generative AI.