The 2022 GMC Sierra HD introduces only a handful of small changes and updates over the preceding 2021 model year, arriving as the third model year of the fourth-generation nameplate. Now, however, GM Authority has learned that the 2022 GMC Sierra HD is no longer available to order with the optional 730 cold-cranking amps auxiliary battery.
According to GM Authority sources, the 2022 GMC Sierra HD’s 730 cold-cranking amps/70 Amp-hr auxiliary battery (RPO code K4B) is currently unavailable to order for all configurations of the Sierra 2500HD and Sierra 3500HD. Usually, the 730 cold-cranking amps auxiliary battery is offered in conjunction with the naturally aspirated 6.6L V8 L8T gas engine, and requires either dual alternators (RPO code KHF), or the 220-amp alternator (RPO code KW5). To note, the 2022 GMC Sierra’s 730 cold-cranking amps auxiliary battery was not available with the 170-amp alternator (RPO code KW7). Pricing for the feature was previously set at $135.
For those who may not know, the 730 cold-cranking amps auxiliary battery is designed to provide the 2022 GMC Sierra HD with extra cold-weather starting power, as well as supply electrical power to additional equipment (such as a trailer or slide-in camper) and thus maintain adequate cranking power for the main battery.
With regard to the truck’s the specs, the 2022 GMC is offered with two powertrain options, including the atmospheric 6.6L V8 L8T gasoline engine, which is rated at 401 horsepower at 5,200 rpm and 464 pound-feet of torque at 4,000 rpm, and the 6.6L V8 L5P turbodiesel Duramax engine, which is rated at 445 horsepower at 2,800 rpm and 910 pound-feet of torque at 1,600 rpm. Handling the cog swaps for the L8T is the GM six-speed automatic transmission, while the L5P mates to the Allison-branded 10-speed automatic transmission.