How much horsepower does a 2025 Duramax have?
In 2025, Duramax-powered light-duty pickups deliver 305 horsepower, while the heavy-duty Duramax in HD trucks produces 445 horsepower.
Overview of the 2025 Duramax lineup
The 2025 Duramax family covers two primary configurations for GM’s trucks. The following section highlights the main horsepower figures you’re likely to encounter in fresh models for 2025.
- 3.0L Duramax Inline-Six Turbo Diesel (LM2): 305 horsepower and 495 lb-ft of torque.
- 6.6L Duramax V8 Turbo Diesel (HD variant): 445 horsepower and 910 lb-ft of torque.
These figures reflect typical factory ratings for standard configurations. Actual horsepower and torque can vary by model year, trim, drivetrain, emissions tuning, and market.
Details by vehicle class
Light-duty pickups (Silverado 1500 / Sierra 1500)
The 3.0L Duramax is the diesel option for light-duty GM pickups in 2025, offering a balance of power and efficiency. It is rated at 305 hp and 495 lb-ft of torque, with the torque curve supporting strong mid-range performance for towing and acceleration.
Heavy-duty pickups (Silverado HD / Sierra HD)
The heavy-duty lineup relies on the 6.6L Duramax V8 turbo diesel, delivering 445 hp and 910 lb-ft of torque. This setup is tuned to maximize payload and towing capability, with variations by cab/bed configuration and drivetrain.
Beyond these two main configurations, there are older or market-specific variants in the Duramax family, but the 2025 consumer-focused offerings center on the 3.0L I6 for light duties and the 6.6L V8 for heavy duties.
Summary
For 2025 GM pickups and heavy-duty models, horsepower ranges from 305 hp in light-duty trucks to 445 hp in the HD lineup, with corresponding torque of 495 lb-ft and 910 lb-ft. Always verify the exact rating on the vehicle’s window sticker or official GM specifications for a given build, as exact figures can vary by configuration and market.
