GMC Sierra 2500
Problems & Worst Years

Complaint volume for the GMC Sierra 2500 is modest in both years captured here, and the two years don't share much of a common thread. 2015 logs 89 occurrences across 11 problems, none safety-rated, led by 29 reports of dim headlights and 20 describing poor visibility more generally — essentially the same underlying lighting concern described two different ways, together accounting for more than half the year's complaints. A handful of smaller reports round out the year: steering wheel and truck vibration, airbag recall non-compliance, and power steering assist malfunction, each with 5 reports.

2024 is a smaller file at 44 occurrences across 6 problems, also with no safety-rated entries, but the issues are different in character. Transmission problems lead — 12 reports describing loss of power and erratic behavior — followed by 10 reports of electrical system failures causing unexpected behavior, 9 of the tailgate opening unexpectedly while in park, 7 describing the trailer brake control module disconnecting trailer brakes, and 4 of engine stall at idle tied to the stop-start system.

For a 2015, the lighting complaints are worth testing directly after dark rather than assuming factory headlights are adequate, and confirming any airbag recall was actually completed. For a 2024, the trailer brake control module issue is particularly relevant for anyone planning to tow, and deserves a direct functional test with a trailer attached if possible, alongside a check of transmission behavior under load.

With only two years and modest volume in each, this isn't a large enough sample to draw a strong conclusion either way. These figures represent what owners chose to file with NHTSA, not a measured failure rate, and the 2024's lower count likely reflects less time on the road as much as anything else. A pre-purchase inspection and documented service history on the individual truck remain the better guide.