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Reliability Database
GMC

Sierra 1500

Full-Size Truck
Best Engine ✅ Recommended (3.9)
4 Generations
73 Engines Rated
10,679 Total Complaints
Engine Ratings
45 recommended 22 caution 6 avoid

Generation Timeline

2000-2006 GMT800
28 engines
3,698 complaints 🔥 63 ☠ 12
5.3L 8-cyl ✅ Recommended (3.9)
→
2007-2013 GMT900
24 engines
1,961 complaints 🔥 26
6.6L 8-cyl ✅ Recommended (3.8)
→
2014-2018 K2XX
12 engines
2,409 complaints 🔥 26 ☠ 1
6.6L Turbo 8-cyl ✅ Recommended (3.9)
→
2019-2025 T1XX
9 engines
2,611 complaints 🔥 18
Unknown ✅ Recommended (3.9)
→
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