Sierra 2500HD Denali Ultimate Duramax L5P 6.6

T1XX · 2024–present4WDPickup

Top HD trim added with the 2024 refresh, when the Duramax was uprated to 470 hp / 975 lb-ft. Alpine Umber interior, power sunroof, 16-way massaging front seats, KICKER MultiPro audio.

464 hpPower

2024Year

Engineering passport

Specifications

Powertrain

Engineering details

Engine6.6 Duramax V8 (L5P)

Displacement6.6 L

Cylinders8

FuelDiesel

Transmission10-speed Allison Automatic

Drivetrain4WD

Performance

Numbers that matter

Power464 hp

Torque1322 Nm

BodyPickup

STORY

Sierra HD is the collective name for GMC's heavy-duty pickup line, encompassing the 2500HD and 3500HD models built for higher towing and payload than the light-duty Sierra 1500. The current T1XX-based HD trucks, launched for 2020, are powered by the L5P 6.6L Duramax diesel with a 10-speed Allison or the 6.6L gasoline V8. They introduced the AT4 off-road trim, Denali luxury variant, and advanced camera-based trailering systems.

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