GMC

Sierra HD

Heavy-Duty Truck

3 Generations

26 Engines Rated

2,133 Total Complaints

Generation Timeline

Years	Generation	Engines	Complaints	Best Engine
2007-2014	2nd	16	1,106	LLR ✅ Recommended (4.4)	View →
2015-2019	3rd	7	585	LMM ✅ Recommended (4.4)	View →
2020-2025	4th	3	442	L87 ✅ Recommended (4.4)	View →