THE WEEKLY DRIVER

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Reliability Database
GMC

Sierra HD

Heavy-Duty Truck
Best Engine ⚠️ Caution (3.4)
3 Generations
26 Engines Rated
2,133 Total Complaints
Engine Ratings
7 recommended 12 caution 7 avoid

Generation Timeline

2007-2014 2nd
16 engines
1,106 complaints 🔥 27 ☠ 1
6.2L 8-cyl ⚠️ Caution (3.4)
→
2015-2019 3rd
7 engines
585 complaints 🔥 19
6.2L 8-cyl ⚠️ Caution (3.0)
→
2020-2025 4th
3 engines
442 complaints 🔥 10
6.6L 8-cyl ❌ Avoid (1.9)
→
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