2023 GMC Sierra 2500HD Interior and Cargo

GMC Sierra 2500HD Interior & Cargo Rating

2023 Sierra 2500HD Interior

Two years ago's redesign did wonders for the Sierra 2500HD's appeal: it's an attractive truck to look at, but unfortunately, the same cannot be said for the inside of the cabin. The design seems rudimentary and out of date when compared to rivals from Ford and Ram, and the choice of materials isn't that impressive either. Denali models do an excellent job of lifting the cabin with plusher materials, but the design remains an issue. Thankfully, there's a lot of interior space to thrash about in disappointment. In base form, this is a simple working truck that offers vinyl seats and manual windows, but the higher up you go, premium features such as rear-seat infotainment and navigation become available.

2023 Sierra 2500HD Interior Photos

2023 GMC Sierra 2500HD Dashboard CarBuzz
2023 GMC Sierra 2500HD Infotainment System CarBuzz
2023 GMC Sierra 2500HD Seating Trim CarBuzz

Seating and Interior Space

From the three-seater Regular Cab to Double and Crew Cabs with two rows, this big truck offers ample space and can accommodate up to six people depending on cab style. The AT4 and Denali reduce the usual six seats to five due to their sporty bucket-style seats. The GMC Sierra 2500HD offers a generous 43.11 inches of headroom in the Regular Cab, while Double and Crew Cabs drop that figure to 43.03 in the front. Legroom is also generous at 44.53 inches in front for all cab styles, while the Crew Cab provides a massive 43.4 inches of legroom for back seat passengers. The standard seats are well-padded and will find preference with those who rack up lots of miles. The driving position is high-set, which aids in forward visibility. SLT models and upward gain ten-way power-adjustable front seats.

2023 GMC Sierra 2500HD Interior Dimensions:

GMC Sierra 2500HD TrimsProSLESLTAT4Denali
Headroom Front Seat43.03 in.43.03 in.43.03 in.43.03 in.43.03 in.
Headroom Back Seat39.88 in.39.88 in.39.88 in.40.12 in.40.12 in.
Legroom Front Seat44.53 in.44.53 in.44.53 in.44.53 in.44.53 in.
Legroom Back Seat35.24 in.35.24 in.35.24 in.43.4 in.43.4 in.
Shoulder Room Front66.02 in.66.02 in.66.02 in.66.02 in.66.02 in.
Shoulder Room Rear64.88 in.64.88 in.64.88 in.65.3 in.65.3 in.
Hip Room, Front60.9 in.60.9 in.61.18 in.61.18 in.61.18 in.
Hip Room, Rear60.24 in.60.24 in.60.24 in.60.24 in.60.24 in.

Interior Colors and Materials

The 2500HD is a hard-working truck, especially in base trim, so it makes sense that GMC has gone with hard-wearing materials instead of a more premium choice. The base model is as basic as it comes and is fitted with a choice of Jet Black cloth or vinyl seats and a rubberized vinyl floor covering. This setup should last the working man a good few years. The SLE adds a bit of comfort in the form of standard carpeted flooring and a leather-wrapped steering wheel. It also adds Dark Walnut/Slate to the color palette, drops vinyl as a material choice. The SLT gets perforated, leather-appointed front outboard seats, and front and rear carpeted floor mats. The AT4 has premium floor liners, and the top of the range Denali gets its own unique Forge perforated leather upholstery. Color choices are rather limited. For example, the entry-level model and AT only offer Jet Black, while the SLE and SLT add Dark Walnut/Slate as an option. The Kalahari accents of the AT4 add a bit more flair to the environment, and the Denali gets exclusive access to the Dark Walnut/Dark Ash Grey combination.

2023 Sierra 2500HD Trunk and Cargo Space

The entire point of buying the GMC Sierra 2500HD is to gain access to the bed in the back. GMC offers the truck with two bed lengths, namely the standard and long beds. The standard supplies a sizable 69.5 cubic feet of space. If you're after more space, the long bed (which is 16 inches longer) provides 83.5 cubic feet of space.

Inside, small-item storage depends on which cab style is selected, but all include cupholders and a glovebox. Some cab styles have under-seat storage in the front and rear, and some have large center console storage units. Crew Cab models in the lower trims get a 60/40-split folding rear seat.

2023 GMC Sierra 2500HD Trunk and Cargo Space Photos

2023 GMC Sierra 2500HD Armrest CarBuzz
2023 GMC Sierra 2500HD Rear View CarBuzz
2023 GMC Sierra 2500HD Cargo Capacity CarBuzz

2023 GMC Sierra 2500HD Bed Size:

GMC Sierra 2500HD TrimsProSLESLTAT4Denali
Box Length (Floor)82.2 in.82.2 in.82.2 in.82.2 in.82.2 in.
Box Width (Floor)71.4 in.71.4 in.71.4 in.71.4 in.71.4 in.
Box Width (Wheelhousings)50.55 in.50.55 in.50.55 in.50.55 in.50.55 in.
Box Height (Area)21 in.21 in.21 in.21 in.21 in.
Cargo Box Volume21 cu. ft.21 cu. ft.21 cu. ft.21 cu. ft.21 cu. ft.

2023 Sierra 2500HD Infotainment and Features


Five models make up the range, but as we found in prior reviews, don't expect anything spectacular at the lower end. The base-model Sierra comes with only the basics such as four-way manually adjustable vinyl/cloth seats, a 3.5-inch diagonal monochromatic driver information display, single-zone climate control, a rearview camera, hitch guidance, and dual USB ports. The SLE adds features such as cruise control, cloth seats, a leather steering wheel, a compass, and a 4.2-inch color driver-information display. The mid-range SLT's specs are more impressive and include a 10-way power front seats (driver's seat with power lumbar support), leather upholstery, heated front seats, a heated steering wheel, dual-zone automatic climate control, hitch view added to the hitch guidance, and remote start. The off-road AT4 adds features such as front bucket seats with ventilation, heated rear outboard seats, and a front center console. The range-topping Denali includes an eight-inch digital driver info center, a bed-view camera, HD surround vision, a universal home remote, and wireless charging. A 15-inch diagonal multi-color head-up display is available optionally on both the AT4 and Denali.


The infotainment system has become a critical selling point for most modern vehicles, even heavy-duty trucks, so it is disappointing to find a small seven-inch touchscreen display in the base model Sierra 2500HD. At least the system is quick to respond to inputs. The base system comes with Bluetooth streaming, an AM/FM radio, a six-speaker sound system, and Android Auto and Apple CarPlay integration. However, the base Regular Cab makes do with only two speakers. The SLE gets the base system with an eight-inch display and adds 4G LTE Wi-Fi compatibility and SiriusXM radio. The SLT gets the premium infotainment system, also with an eight-inch display, which includes wireless phone projection, SiriusXM 360 L, HD Radio, and voice-activated technology. The top-of-the-range Denali adds navigation and a seven-speaker premium Bose sound system that does a much better job of playing back your favorite tunes.

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