GMC Yukon

2026 GMC YUKON AT4 ULTIMATE 4WD — CANADIAN SPECIFICATION

ENGINE AND DRIVETRAIN

The Yukon AT4 Ultimate runs the 6.2-litre EcoTec3 V8 — GM engine code L87, 6,162 cc, naturally aspirated, aluminium block, overhead valve, with direct injection, variable valve timing and Dynamic Fuel Management cylinder deactivation. GM Canada rates it at 420 horsepower at 5,600 rpm and 460 lb-ft (624 Nm) of torque at 4,100 rpm. Drive passes through a 10-speed automatic transmission, electronically controlled with overdrive and carrying the Traction Select System including a tow/haul mode, to a four-wheel-drive system on a 3.23 rear axle ratio. Gear selection is by Electronic Precision Shift. The vehicle is fitted with automatic engine stop/start with a non-latching disable button, upper active aero shutters, and a heavy-duty air-to-oil auxiliary external transmission oil cooler. Fuel tank capacity is approximately 91 litres. The Canadian listing quotes consumption of 16.8 L/100 km city, 13.1 L/100 km highway and 15.1 L/100 km combined; no CO2 figure is published for this vehicle and none is stated here.

CHASSIS, STEERING AND BRAKES

The unit's own equipment list specifies a front coil-over-shock arrangement with a stabiliser bar and a rear multi-link layout with coil springs, power steering, and four-wheel antilock four-wheel disc brakes with DURALIFE rotors. GM Canada specifies Air Ride Adaptive Suspension and Magnetic Ride Control as AT4 Ultimate grade content, and 20-inch machined and painted wheels on all-terrain tyres; neither the adaptive suspension hardware nor the road wheels appear in the selling dealer's own equipment list, which itemises only the spare, so both should be confirmed with the seller before purchase. The spare is a full-size 17-inch (43.2 cm) steel wheel carrying a P265/70R17 all-season blackwall tyre on a lockable winch-type carrier mounted under the frame at the rear, with a mechanical jack and tools. GM Canada publishes no brake dimensions or steering-rack specification for this grade, so none are stated.

DIMENSIONS AND CAPACITIES

The GM Canada spec sheet for the Yukon AT4 Ultimate gives an overall length of 5,337 mm (210.1 in) and an overall height of 1,943 mm (76.5 in), with passenger capacity of seven. Front legroom is 1,130 mm (44.5 in) and the listing records 1,067 mm of second-row legroom. Cargo volume is 722 litres (25.5 cu ft) behind the third row, 2,053 litres (72.5 cu ft) behind the second row and 3,477 litres (122.8 cu ft) behind the first row. Gross vehicle weight rating is 3,493 kg (7,700 lb), taken from the vehicle's own equipment list. GM Canada does not publish overall width, wheelbase, kerb weight or ground clearance for this grade in any accessible source, and those figures are deliberately omitted rather than substituted from the US sheet — container and Ro-Ro planning should treat the mirrors- extended width as unmeasured.

EXTERIOR

The vehicle is finished in Onyx Black. Lighting is LED throughout: LED headlamps with LED daytime running lamps, enhanced animation and walk-up lighting, IntelliBeam automatic high beam, LED front fog lamps, and animated LED tail lamps. The exterior mirrors are heated, power-adjustable and power-folding with driver-side auto-dimming, integrated turn signal indicators, puddle lighting and body-colour caps. Glazing is deep-tinted, with an acoustic laminated windscreen carrying a shade band and laminated front door windows. Rainsense intermittent front wipers, an intermittent rear wiper and an electric rear-window defogger are fitted, along with upper active aero shutters. Black GMC emblems were installed by the selling dealer. GM Canada lists the high approach angle front fascia with skid plate and red recovery hooks, power-retractable assist steps with LED perimeter lighting, the AutoSense power liftgate and the panoramic power sunroof as AT4 Ultimate or Yukon-range equipment, but none of them appear in this unit's equipment list and none is claimed here.

INTERIOR AND SEATING

The cabin is a three-row seven-seat layout on front bucket seats, trimmed in Obsidian Rush full-grain leather with red accents — the AT4 Ultimate seat treatment, confirmed by the listing's own interior description. The driver and front passenger seats are heated with 8-way power adjustment, and the memory system recalls two driver presets covering the power driver seat, the exterior mirrors and the tilt and telescopic steering column. The second- row outboard positions are heated and the steering wheel is heated. A power-sliding floor centre console with a drawer, secure storage, a manual sliding armrest and cup holders serves the second row, sliding back 254 mm (10 in); fitting it deletes the two USB charge/data ports otherwise carried inside the centre console. The third row is a 60/40 split-folding power-folding bench. Climate control is tri-zone automatic with separate settings for driver, right front passenger and rear occupants, rear air conditioning, a pollutant and fine dust cabin filter and an engine air filtration monitor. Trim details include colour-keyed carpeting, removable colour-keyed carpeted first and second row floor mats, illuminated driver and front passenger vanity mirrors, interior lighting with delayed entry and front and second-row map lights, and assist handles at the front passenger A-pillar, the second-row outboard B-pillar and overhead for both front occupants. Dealer- installed additions are all-weather floor liners for the first, second and third rows, an all-weather cargo area protector and a sport pedal cover set. GM Canada specifies 16-way power front seats with a massage feature and ventilated front seats as AT4 Ultimate grade content; this unit's own equipment list records 8-way power adjustment and heating only, and the higher-specification seats are therefore not claimed.

INFOTAINMENT AND CONNECTIVITY

The centre display is the 16.8-inch diagonal Premium GMC Infotainment System — a high-contrast multitouch colour screen with local backlight dimming, Google built-in, navigation capability, connected apps, personalised profiles for each driver's settings and Natural Voice Recognition. Ahead of the driver is an 11-inch diagonal multi-colour digital high-contrast Driver Information Centre with its own local backlight dimming. Wireless Apple CarPlay and wireless Android Auto are standard, along with wireless phone charging and a Universal Home Remote with programmable garage door opener. Connectivity covers 5G Wi-Fi hotspot capability, GMC Connected Access capability, OnStar Basics services capability and a three-year SiriusXM with 360L subscription supplied by the selling dealer. Power and data provision is two type-A and type-C charge and data ports on the front console, two type-C charge-only ports in the third row, and two 120-volt outlets at the rear of the centre console and in the rear cargo area. Steering-wheel controls cover audio, the Driver Information Centre, Adaptive Cruise Control, Forward Collision Alert following gap and steering wheel heating. The Bose 18-speaker Centerpoint system that GM Canada specifies for AT4 Ultimate is not itemised in this unit's equipment list and is not claimed.

DRIVER ASSISTANCE AND SAFETY

The unit's equipment list confirms Enhanced Automatic Emergency Braking, Forward Collision Alert, Front Pedestrian and Bicyclist Braking, Intersection Automatic Emergency Braking, Reverse Automatic Braking, Rear Pedestrian Alert, Rear Cross Traffic Braking, Side Bicyclist Alert, Traffic Sign Recognition and the Safety Alert Seat, alongside Adaptive Cruise Control and Enhanced Automatic Parking Assist, which applies semi-automatic steering with limited braking and gear selection into a detected parallel or perpendicular space. HD Surround Vision with a rear camera washer provides the camera views. Chassis and occupant systems comprise StabiliTrak stability control with brake assist, traction control and electronic trailer sway control, Hill Start Assist, four-wheel antilock four-wheel disc brakes with DURALIFE rotors, and a Tire Pressure Monitoring System with auto-learn and Tire Fill Alert. Airbag protection is frontal airbags for the driver and front outboard passenger, seat-mounted side-impact airbags for the driver and front outboard passenger, a driver inboard seat-mounted side-impact airbag, head-curtain airbags for all rows in outboard positions, and a front outboard Passenger Sensing System. Child restraint provision is LATCH lower anchors and top tethers in all second-row positions with top tethers in the third row, plus manual rear child security door locks. Teen Driver, Buckle to Drive, Rear Seat Reminder, an electrical steering column lock and an unauthorised-entry theft-deterrent system are also fitted. Super Cruise hands-free driver assistance and Night Vision are AT4 Ultimate standard and optional content respectively in Canada, and lane keep assist, lane departure warning and blind zone alert appear nowhere in this unit's equipment list; none of them is claimed on this vehicle. Neither NHTSA nor IIHS has published a crash rating for the 2026 GMC Yukon.

OFF-ROAD AND TOWING

Four-wheel drive runs through a 3.23 rear axle with the Traction Select System including a tow/haul mode. Heavy-duty trailering equipment is fitted: a trailering hitch platform, a 2-inch trailering receiver, a 7-wire harness with independent fused trailering circuits mated to a 7-way connector, electronic trailer sway control and Hitch Guidance, supported by the heavy-duty air-to-oil auxiliary external transmission oil cooler. GM Canada's AT4 Ultimate off-road hardware — the high approach angle front fascia with skid plate, red recovery hooks, all-terrain tyres on 20-inch wheels, Air Ride Adaptive Suspension and Magnetic Ride Control — is grade content that the selling dealer does not itemise, and is not claimed as fitted to this unit. No towing capacity is stated: the GM Canada AT4 Ultimate page carries an 18,500 lb figure that contradicts the same manufacturer's published Yukon maximum of 8,400 lb, and no reliable grade-specific rating could be verified.

Sources: the CarGurus.ca selling listing (Léveillé Chevrolet Buick GMC, Saint-Jérôme, Quebec) for the equipment, colours, consumption and measurements confirmed on this individual vehicle; gmccanada.ca 2026 Yukon AT4 and AT4 Ultimate pages and the GM Canada Build & Price powertrain data for Canadian-market grade content, dimensions, cargo volumes, fuel tank capacity and engine ratings. US-market figures were deliberately not substituted where GM Canada publishes nothing.