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2021 GMC Sierra 2500 problems: engine and transmission complaints and recalls
48% of relevant owner complaints filed with NHTSA on the 2021 GMC Sierra 2500 are about the engine, transmission or fuel system. That is a model-level pattern, not bad luck.
Worse than 60% of the 1,789 model years we track (2010–2023).
Excludes 11 airbag, lighting and seat-belt recall complaints that would otherwise mask the signal (unadjusted: 37%).
Looking at a specific Sierra 2500?Check its VIN: the full report, quotes about its own engine, and whether its recalls are still open. First report free.
Check a VINDoes the 2021 GMC Sierra 2500 have transmission problems?
Owner complaints say yes, as a model-year pattern. 19 of 40 relevant complaints filed with NHTSA about the 2021 GMC Sierra 2500 concern the engine, transmission or fuel system (48%), and the largest group is filed under power train (12). For comparison, the 2020 scores 47% and the 2022 scores 30%. On a test drive, check for shuddering, slipping, delayed or harsh shifts, or a whine at speed. This describes the model year, not any one car: a well-maintained or already-repaired example can be fine, and a clean model year can still have a bad car in it.
Complaints by component
The years either side
Manufacturers fix things mid-generation. A bad year next to a clean one is common; the fix usually arrived in between.
Cleaner alternatives
Same car, a better year
Other heavy-duty pickups with no elevated signal
The percentage is each model year's drivetrain complaint share. No elevated signal describes the model year, not any one car; a well-kept example of a flagged model can still be the right buy, and any of these still needs an inspection.
What owners reported
Three of 19 drivetrain complaints. The full report shows more, with quotes about the engine in the car you are looking at first.
Recall campaigns on the 2021 GMC Sierra 2500 (6)
This does not say whether a particular car has an open, unrepaired recall. That depends on the VIN.
Before you buy a 2021 GMC Sierra 2500
- Ask the seller whether the transmission has ever been repaired or replaced, and whether the car has shown shuddering, slipping, delayed or harsh shifts, or a whine at speed.
- Drive it from a cold start and long enough to warm up. Many transmission faults hide once the car is warm.
- Get an independent pre-purchase inspection from a mechanic you choose, and tell them to focus on the transmission.
- 6 recall campaigns on this model year. Whether a specific car still has one open depends on the VIN; the report checks that.
- Ask for service records. A transmission already replaced under warranty is a different car from one that was not.
Questions people ask about the 2021 GMC Sierra 2500
Does the 2021 GMC Sierra 2500 have transmission problems?
Owner complaints say yes, as a model-year pattern. 19 of 40 relevant complaints filed with NHTSA about the 2021 GMC Sierra 2500 concern the engine, transmission or fuel system (48%). Before buying one, have an independent mechanic check the transmission and ask the seller whether it has been repaired or replaced.
Are there engine or transmission recalls on the 2021 GMC Sierra 2500?
NHTSA lists 6 recall campaigns on the 2021 GMC Sierra 2500. Whether a specific car still has one open depends on its VIN.
Which GMC Sierra 2500 years are better?
Among the GMC Sierra 2500 years we track, the 2010 (11%), the 2016 (28%) and the 2022 (30%) have a lower engine and transmission complaint share than the 2021 (48%). Manufacturers fix things mid-generation, so the year before or after can be a different car.
Should I buy a 2021 GMC Sierra 2500?
That depends on the car in front of you, not just the model year. The 2021 GMC Sierra 2500 has an elevated transmission complaint pattern, so treat it as a car that needs proof: service records showing transmission work, a cold-start test drive, and an independent pre-purchase inspection focused on the transmission. A well-kept or already-repaired example can be a fine car; an unknown one is a gamble.
Have the VIN?Paste it and get the full report for that car. First report free, then a 30-day pass covers a whole car search.
Check a VINExperimental model-level information. This is not a vehicle inspection, vehicle-history report, financial advice or purchase recommendation. It describes patterns across a model year, not the condition of any individual vehicle.