2024 GMC Sierra HD Rear-Seat USB Ports Under Constraint
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Earlier this year, GM Authority reported that the refreshed 2024 GMC Sierra HD lineup would receive limited 12-volt power outlet availability. Now, we’ve learned that the rear-seat USB port option will be under constraint for certain units of the heavy-duty pickup truck.
GM Authority sources tell us that the rear-seat USB ports (RPO code UBI) are currently under constraint. Affected vehicles will be indicated as such with RPO code RFO on their window sticker. As of the time of this writing, it’s unclear if there will be a dealer retrofit available later on.
For reference, the rear-seat USB ports were normally optional on the base Pro trim level, but required choosing the 120-volt interior power outlet (RPO code KI4). Notably, this makes the Pro the only trim affected by this constraint.
In regard to the other trim levels, the rear-seat USB ports are available on the SLE when equipped with the SLE Convenience Package (RPO code PCQ). SLT, AT4, Denali and Denali Ultimate trims receive the feature as standard.
As a brief reminder, the 2024 GMC Sierra HD receives a mid-cycle refresh that features revised exterior styling, an overhauled cockpit, powertrain enhancements, and more.
Under the hood, most trim levels of the 2024 Sierra HD are equipped with the 6.6L L8T V8 gasoline engine, while the 6.6L V8 L5P turbodiesel Duramax engine is optional. Notably, the range-topping Denali Ultimate trim features the Duramax as standard, which has been uprated to 470 horsepower and 975 pound-feet of torque as part of the redesign.
Regardless of engine option, every Sierra HD model utilizes the Allison-branded 10-speed automatic transmission as standard, which replaces the GM six-speed equipped by gasoline-powered models previously.
As for structure, the Sierra HD rides on a more capable version of the GM T1 platform, while production began earlier this month at the GM Flint plant in Michigan.
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I’d be nervous the first time filling up my truck with gas if it has an Allison badge and says 6.6l on the side
I know it’s cheaper, but if the new fake Allison transmission doesn’t hold up then this move will be another huge GM blunder. Believe it or not that transmission sold a lot of HD’s.
I’m in the dark on this comment. Why do you say it’s a “fake” Allison? I have a 2002 Silverado dually with the 8.1 and Allison trans that we purchased new and assumed this new one was similar other than being a 10 speed.
Thanks for any info
The article states that these are now Allison-branded transmissions built by GM. The real Allison transmissions only go into 4500 – 6500 medium duty trucks now.
Thanks Carl
GM needs new better quality suppliers and leadership!
Why not offer the real Allison Transmission as an option for those willing to pay for it?
Really? They can’t take the USB plugs from a slower selling vehicle and use those in these high-volume trucks? Who is running things at GM? It must be someone that checks all the diversity boxes, but has no clue how to run an auto manufacturing company. Diversity is more important nowadays instead of experience – just look at our VP and Secretary of Transportation and see how that’s working.
USB ports under constraints? Really GM? What a joke. Thank god I can buy USB ports at 7-11.
I’ve got an idea! How about you provide us the 12v outlets we all wanted and we can provide our own USB outlets. The stock ones you provide charge at a snails pace and shutoff with the truck. This isn’t rocket science.
Isn’t there a fuse slot that you just put a fuse into and it gives the accessory outlets constant 12v? (Or in this case 3.3v)? There definitely was on the 2019.