Used GMC Sierra 1500 for Sale near Diamond Bar, CA

Summary

• With 7,820 currently listed for sale on CarGurus and an average price of $35,104.70, 35% of 2020 GMC Sierra 1500s for sale on CarGurus are rated as good or great deals.
• Favorably reviewed: Owners rated the 2020 GMC Sierra 1500 4.7 / 5 stars and CarGurus experts gave it an 8.3 / 10.
• 76.6% of 2020 Sierra 1500 models on CarGurus are accident free.
• The 2020 GMC Sierra 1500 earned high predicted reliability ratings from J.D. Power, making it a smart choice for used truck buyers.

Why it stands out

The GMC Sierra 1500 stands out in the full-size truck segment due to its blend of luxury and capability, particularly in its fifth generation. With upscale interiors that rival those of SUVs, advanced technology options, and a versatile powertrain lineup—including turbocharged engines—it caters to both worksite needs and family use. The AT4 trim further enhances its appeal by offering off-road prowess alongside comfortable features, making it an excellent choice for drivers seeking a reliable truck that can seamlessly transition from rugged tasks to everyday commuting.

Other model years to consider

When considering the GMC Sierra 1500, the 2019 and 2022 model years stand out as excellent options due to their strong user ratings and affordability. The 2019 model offers a competitive average price of $33,279 while maintaining a user rating of 4.7/5, making it both budget-friendly and highly rated among owners. Similarly, the 2022 model, priced at an average of $44,241, boasts an impressive user rating of 4.7/5 and presents a solid selection with around 35% classified as good or great deals in the market.

Model years to approach with caution

The 2026 GMC Sierra 1500 presents challenges with its average price of over $64,500, where a significant 65% of listings are categorized as not good or great deals. Similarly, the 2010 model year is marked by an average price around $11,600 and has a high percentage of listings (81%) that do not meet favorable deal criteria. Additionally, earlier model years like 2007 and 2005 show user ratings above 4.3 but face considerable availability constraints with over 88% of listings deemed not good or great deals.

These recommendations are based on CarGurus' proprietary market data from December 17, 2025, CarGurus experts' opinions, and generative AI.