The Lemon IndexAll cars · GMC · GMC Sierra 2500HD/3500HD
2025 GMC Sierra 2500HD/3500HD problems, engines and recalls.
Owners filed 47 complaints with the government about the 2025 GMC Sierra 2500HD/3500HD, most often about brakes (28%).
Which engine is in it
46 of the 47 complaints have a VIN we could decode, which tells us the engine.
| Engine | Share | Complaints | What they name most |
|---|---|---|---|
| 6.6 Duramax L5P diesel | 87% | 40 | brakes 25%, engine 15%, steering 15% |
| 6.6 V8 gas (L8T) | 13% | 6 | too few to split |
Each diesel's page: Duramax L5P.
Nearby model years
What owners complain about
Share of this year's complaints that name each area.
How serious
| Crashes | Fires | Injury reports | Death reports | Towed |
|---|---|---|---|---|
| 4 | 0 | 2 | 0 | 4 |
As reported by owners to NHTSA, not verified.
In owners' words
Air bags didn’t deploy after being hit so hard in the side it bent the frame and my daughters head head hit the side window
2025 GMC Sierra 2500HD/3500HD owner · NHTSA complaint 11765437
A driver hit me in the side of the car at around 70 mph to where it bent the frame of the truck and the airbags did not deploy causing a major issue and my daughters head to hit the side window.no warning lamps and it’s currently at a body shop right now
2025 GMC Sierra 2500HD/3500HD owner · NHTSA complaint 11765436
Normal driving 40mph brake failure and power steering loss. Towed vehicle to dealership
2025 GMC Sierra 2500HD/3500HD owner · NHTSA complaint 11744937
Recalls 2
26V530000 Aug 2026 Tires
General Motors, LLC (GM) is recalling certain 2024-2025 Chevrolet Silverado 2500 and GMC Sierra 2500 vehicles equipped with the enhanced towing option and 20-inch accessory tire/wheel package. The tire information label may state the incorrect rear tire pressure, resulting in underinflated tires and preventing the tire pressure monitoring system (TPMS) from displaying a low tire pressure warning.
Fix. Dealers will inspect, update the engine control module (ECM) software, apply a tire label overlay, inflate tires to the correct pressure, and perform a tire pressure monitor system (TPMS) re-learn process as necessary, free of charge. Owner notification letters were mailed September 17, 2026. Owners may contact Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-800-462-8782.
26V129000 Mar 2026 Fuel System, Gasoline
General Motors, LLC (GM) is recalling certain 2025-2026 Chevrolet Silverado 3500, and GMC Sierra 3500 vehicles with gasoline engines and dual fuel tanks (RPOs L8T and N2N). The rear fuel pump may not transfer adequate fuel to the front tank, causing an engine stall.
Fix. The vehicle's engine control module (ECM) will be updated by a dealer or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed April 8, 2026. Owners may contact GMC customer service at 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N262544420. Vehicle Identification Numbers (VINs) involved in this recall became
NHTSA recalls for this model year under every name these trucks are filed under. A recall that names an engine applies only to trucks with it. Free at any dealer: check the VIN.
Quick answers
Is the 2025 Sierra HD reliable?
We can't score it per truck (heavy-duty sales aren't reported apart from the half-ton). Owners filed 47 complaints about it, most often about brakes (28% of them). Compare the diesel generations on their engine pages.
What engine does the 2025 Sierra HD have?
By the VINs in owner complaints: 6.6 Duramax L5P diesel (87%), 6.6 V8 gas (L8T) (13%).
How many recalls does the 2025 GMC Sierra 2500HD/3500HD have?
2. Recall repairs are free at any dealer; check the truck's VIN at nhtsa.gov/recalls.
The whole-line score for 2025, mostly half-tons: 2025 GMC Sierra.
No Lemon Index score: automakers report heavy-duty pickup sales together with the half-ton (one F-Series, Ram or Silverado number), so there is no honest per-truck denominator. These are counts and shares of owner complaints, not failure rates. Complaints: NHTSA owner complaints filed under the truck's 2500/3500 (F-250/F-350) names, all years filed, one per complaint number. Engine: decoded from the complaint's VIN (position 8 is the engine code) with NHTSA's vPIC decoder. Complaints filed as just “Silverado” or “Sierra” are left out (they mix 1500s and HDs). Older trucks have had more years to collect complaints, and popular years draw more because more were sold.
Updated · Free to use with credit: Source: The Lemon Index (lemonindex.com)
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