As previously covered by GM Authority, the 2024 GMC Sierra HD lineup was unavailable to order with every LPO, or dealer-installed, accessory assist step option. Now, the 2024 Sierra HD is available with several of these LPO features once more.
GM Authority sources familiar with the matter tell us that the following accessory assist steps are now available to order (relevant RPO code in parenthesis):
- Six-inch rectangular chromed tubular assist steps, LPO (VXH)
- Six-inch rectangular Black tubular assist steps, LPO (RVQ)
- Three-inch round Black tubular off-road assist steps, LPO (S6L)
It’s worth noting that the following accessory assist step options are still unavailable (relevant RPO code in parenthesis):
- Four-inch round chromed assist steps, LPO (VXJ)
- Four-inch round Black assist steps, LPO (RVS)
- Black work step, LPO (VQO)
- Off-road high clearance steps, LPO (VXW)
In regard to accessibility, these options have varied availability across the Sierra HD trim lineup:
|Assist Step||RPO Code||Pro||SLE||SLT||AT4||Denali||Denali Ultimate|
|Six-inch rectangular chromed tubular assist steps, LPO||VXH||-||A||A||-||-||-|
|Four-inch round chromed assist steps, LPO||VXJ||-||A||-||-||-||-|
|Six-inch rectangular Black tubular assist steps, LPO||RVQ||A||-||-||-||-||-|
|Four-inch round Black assist steps, LPO||RVS||A||-||-||-||-||-|
|Black work step, LPO||VQO||A||-||-||-||-||-|
|Three-inch round Black tubular off-road assist steps, LPO||S6L||-||-||-||A||-||-|
|Off-road high clearance steps, LPO||VXW||-||-||-||A||-||-|
Additionally, every factory-installed assist step option remains available to order (relevant RPO code in parenthesis):
- Six-inch rectangular chrome assist steps (BVQ)
- Power-retractable Black assist steps with bright trim and LED lighting (BRS)
- Power-retractable Black assist steps with LED lighting (B3L)
As a reminder, the 2024 GMC Sierra HD received a mid-cycle refresh that is highlighted by the introduction of the range-topping Denali Ultimate trim level, along with a revised exterior styling, an overhauled cockpit and powertrain enhancements. An all-new 2024 GMC Sierra HD AT4X is also on the way later this year.
As for powertrain, the 2024 Sierra HD utilizes the 6.6L L8T V8 gasoline engine as standard on most trims, while the 6.6L V8 L5P turbodiesel Duramax engine is optional on most trims. The Duramax boasts 470 horsepower and 975 pound-feet of torque, up by 25 horsepower and a 65 pound-feet over the pre-refreshed models. In the case of the Denali Ultimate, the Duramax is equipped as standard.
Regardless of engine option, every GMC Sierra HD is equipped with the Allison-branded 10-speed automatic transmission as standard fare, which replaces the GM six-speed previously found in gasoline-powered configurations.