General Motors refreshed the fifth-generation GMC Yukon full-size SUV for the 2025 model year, debuting a long list of updates and changes for the exterior styling, interior design, technology feature list, and trim level hierarchy. To this latter point, the 2025 GMC Yukon now offers the new Yukon AT4 Ultimate, slotting in above the “standard” Yukon AT4 as a more luxurious option for buyers still after the AT4’s off-roading capabilities. But that still leaves one question unanswered – what exactly is a 2025 GMC Yukon AT4 Ultimate?
The refreshed 2025 GMC Yukon is the first GMC model to offer the new AT4 Ultimate trim, dropping in as a more off-road-oriented counterpart to the highly luxurious Denali Ultimate. Breaking it down, we find that the Yukon AT4 Ultimate incorporates a variety of standard features normally offered as optional on the non-Ultimate AT4, as well as a few unique features to boot.
| Feature | RPO Code | AT4 | AT4 Ultimate |
|---|---|---|---|
| Hitch View | PZ8 | A | S |
| Smart Trailer Integration Indicator | UET | A | S |
| Integrated trailer brake controller | JL1 | A | S |
| Extra capacity cooling system | V03 | A | S |
| Premium Capability Package with Active Reponse 4WD | Z6E | A | S |
| Air Ride Adaptive Suspension | F47 | A | S |
| Electronic limited-slip differential | G96 | A | S |
| 5.3L V8 engine | L84 | S | - |
| 6.2L V8 engine | L87 | A | S |
| 3.0L I6 Duramax diesel engine | LZ0 | A | A |
First and foremost, the Yukon AT4 Ultimate is equipped as standard with the naturally aspirated 6.2L V8 L87 gasoline engine, rated at 420 horsepower and 460 pound-feet of torque. Conversely, the non-Ultimate AT4 trim offers the L87 gasoline engine as an optional upgrade.
The new AT4 Ultimate is also equipped with the GM Super Cruise (RPO code UKL) semi-autonomous driver assist system as standard, enabling drivers to remove their hands from the steering wheel during extended highway driving. Super Cruise is optional on the non-Ultimate AT4.
| Feature | RPO Code | AT4 | AT4 Ultimate |
|---|---|---|---|
| Super Cruise | UKL | A | S |
| Driver Attention Assist | ULM | A | S |
| Rear Camera Mirror | DRZ | A | S |
| Rear Seat Media System | UW9 | A | S |
| Advanced Security self-powered horn | UTR | A | S |
| Advanced Security interior movement sensors | UTV | A | S |
| Advanced Security vehicle inclination sensors | UTU | A | S |
| Advanced Security glass break sensors and lock shields | UTW | A | S |
| 15-inch multi-color head-up display | UV6 | A | S |
| Dual-pane panoramic power sunroof with power sunshade | C3U | A | S |
| Sport Pedal Cover Kit, LPO | SD3 | A | S |
| Blind Zone Steering Assist | UKI | S | - |
| Blind Zone Steering Assist with Trailering | UKW | A | S |
| Floor console with storage area and cupholders | D07 | S | - |
| Power-sliding floor console with drawer, secure storage and cupholders | DCH | A | S |
| Second-row 60/40 split-folding bench with power release | ATT | S | - |
| Second-row bucket seats with power release | ATN | A | S |
| Bose 10-speaker surround audio system with CenterPoint | UQS | S | - |
| Bose 18-speaker surround audio system with CenterPoint | UQP | - | S |
| Wrapped steering wheel | H5G | S | - |
| Leather-wrapped steering wheel | N5M | - | S |
| Driver seat power massage | AF6 | - | S |
| Driver seat 2-way power upper shoulder and 2-way power back bolster adjustment | AHE | - | S |
| Front passenger seat power massage | AKE | - | S |
| Front passenger seat 2-way power upper shoulder and 2-way power back bolster adjustment | AHH | - | S |
| 8-inch rear climate control touchscreen | - | S | |
| Night Vision | UV3 | - | A |
| Forest Storm interior with Mahogany accents and perforated leather | EA8 | S | - |
| Obsidian Rush with Red accents and full grain leather | EA5 | - | S |
| Ash Burl wood accents | - | S |
Further standard tech features for the AT4 Ultimate include Driver Attention Assist (RPO code ULM), the Rear Camera Mirror system (RPO code DRZ), the Rear Seat Media system (RPO code UW9), and a 15-inch multi-color head-up display (RPO code UV6), all of which are otherwise optional for the non-Ultimate AT4.
Unsurprisingly, comfort features abound on the new AT4 Ultimate, with massaging front seats (RPO codes AF6 and AKE), a leather-wrapped steering wheel (RPO code N5M), and Obsidian Rush with Red accents full grain leather upholstery (RPO code EA5) all equipped as standard.
Finally, the exterior features slightly differ between these two trims as well.
| Feature | RPO Code | AT4 | AT4 Ultimate |
|---|---|---|---|
| Black assist steps with Gloss Black insert | BVE | S | - |
| Power-retractable assist steps with perimeter lighting | B3L | A | S |
| 20-inch machined and Carbon Flash Metallic-painted wheels | R4L | S | - |
| 20-inch machined and Talos Bronze Metallic-painted wheels | RSL | - | S |
As a reminder, all 2025 GMC Yukon models ride on the GM T1 platform, while production takes place at the GM Arlington plant in Texas.
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View Comments
I thought GM was dropping trim levels. This one is absurd.
Why not add the engine as an option, and add an "ultimate package" instead of creating a new trim level. Or, just bring back the SLT, the best trim level out of the suburbans and Yukons.
It's Perfect