The best and worst GMC Sierra years, by the numbers
Short answer: among GMC Sierras old enough to judge (2005–2022), the 2018–2021 have the fewest owner complaints per 10,000 sold. The 2008 and 2014 have the most.
We counted every owner complaint filed with the federal government (NHTSA) for each model year and divided by how many were sold that year, so a year that sold more doesn’t look worse just for being popular. Years newer than 2022 are shown but not ranked — they haven’t been on the road long enough. How this is calculated.
Years with the most complaints
2008 GMC Sierra · 4.0 per 10,000 sold (1.8× this model’s typical year)
Most-reported: Airbags, seatbelts and restraints, typically around 69,000 miles; then doors, windows, latches, seats and trim.
2014 GMC Sierra · 4.8 per 10,000 sold (2.1× this model’s typical year)
Most-reported: Wiring harness, grounds and connectors, typically around 600 miles; then doors, windows, latches, seats and trim.
Years with the fewest complaints
2018 GMC Sierra · 0.0 per 10,000 sold (0.0× this model’s typical year)
2019 GMC Sierra · 0.0 per 10,000 sold (0.0× this model’s typical year)
2020 GMC Sierra · 0.0 per 10,000 sold (0.0× this model’s typical year)
2021 GMC Sierra · 0.0 per 10,000 sold (0.0× this model’s typical year)
Every year: complaints per 10,000 sold
Typical GMC Sierra year: 2.2 per 10,000 sold.
Complaints are counted once each, even when an owner lists several parts. Sales are US units sold in the calendar year, a close stand-in for the model year.
Common questions
What is the worst year for the GMC Sierra?
Among GMC Sierras old enough to judge (2005–2022), the 2014 has the most owner complaints per 10,000 sold: 4.8, about 2.1× a typical GMC Sierra year. The 2008 also stands out.
What is the best year for the GMC Sierra?
The 2018 has the fewest owner complaints per 10,000 sold among GMC Sierras from 2005–2022: 0.0, against 2.2 for a typical year. The 2019–2021 are also well below typical.
What goes wrong on the 2014 GMC Sierra?
The most-reported problem on the 2014 GMC Sierra is wiring harness, grounds and connectors, typically around 600 miles.
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Source: NHTSA owner complaints and recalls; US sales from public industry figures. Complaints are self-reported and not independently verified. This is not an inspection and not a recommendation to buy or avoid any vehicle.