Consumer Reports predicts the 2019 GMC Sierra 1500 will deliver below-average reliability, giving it 2 out of 5 total points. It was rated below average for 2016 as well, and way below average for 2017 with a score of 1. JD Power’s 2019 Dependability Study, based on surveyed owners of 2016 models, gives the Sierra 1500 a ranking of 2 overall, with a 2 for powertrain durability, and an average 3 for body/interior and features/accessories. On the other hand, the truck’s mechanical equivalent, the Chevrolet Silverado 1500, fares better in JDP’s report with 4 points overall, so perhaps GMC owners are just fussier.