The GMC Sierra 1500 IV, specifically the Double Cab configuration with the 6.2 EcoTec3 V8 engine paired with an automatic transmission, represents a significant iteration of GMC’s full-size pickup truck. Produced from 2016 to 2018 as part of the GMTK2XX platform’s facelift, this variant aimed to deliver a blend of robust capability, refined comfort, and modern technology to the American truck market. It occupied a premium position within the Sierra 1500 lineup, offering more power and features than the base engine options while remaining a step below the Denali trim level.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 IV (GMTK2XX, facelift 2016) Double Cab |
| Type (Engine) | 6.2 EcoTec3 V8 (420 Hp) Automatic |
| Start of production | 2016 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 15.7 l/100 km (15 US mpg, 18 UK mpg, 6.4 km/l) |
| Fuel consumption (extra urban) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg, 8.9 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 5.6 kg/Hp, 179.6 Hp/tonne |
| Weight-to-torque ratio | 3.8 kg/Nm, 266.5 Nm/tonne |
| Power | 420 Hp @ 5600 rpm |
| Power per litre | 68.2 Hp/l |
| Torque | 623 Nm @ 4100 rpm (459.5 lb.-ft. @ 4100 rpm) |
| Maximum engine speed | 6000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L86 |
| Engine displacement | 6162 cm3 (376.03 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.25 mm (4.06 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 11.5:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 14.8 l (15.64 US qt | 13.02 UK qt) |
| Kerb Weight | 2338 kg (5154.41 lbs.) |
| Max. weight | 3175 kg (6999.68 lbs.) |
| Max load | 837 kg (1845.27 lbs.) |
| Trunk (boot) space – minimum | 1728 l (61.02 cu. ft.) |
| Fuel tank capacity | 98 l (25.89 US gal | 21.56 UK gal) |
| Permitted trailer load with brakes (12%) | 4263 kg (9398.31 lbs.) |
| Length | 5828 mm (229.45 in.) |
| Width including mirrors | 2032 mm (80 in.) |
| Height | 1877 mm (73.9 in.) |
| Wheelbase | 3645 mm (143.5 in.) |
| Front track | 1750 mm (68.9 in.) |
| Rear (Back) track | 1716 mm (67.56 in.) |
| Ride height (ground clearance) | 222 mm (8.74 in.) |
| Minimum turning circle (turning diameter) | 14.3 m (46.92 ft.) |
| Approach angle | 17° |
| Departure angle | 23.1° |
| Ramp-over (brakeover) angle | 18.9° |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Hydra-Matic |
| Front suspension | Independent coil spring |
| Rear suspension | Rigid axle suspension, Leaf spring |
| Front brakes | Ventilated discs, 330×30 mm |
| Rear brakes | Ventilated discs, 345×20 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/70R17; 265/70 R17 |
| Wheel rims size | 8J x 17 |
Powertrain & Engine Architecture
At the heart of this Sierra 1500 variant lies the 6.2-liter L86 EcoTec3 V8 engine. This engine is a naturally aspirated, direct-injection powerplant featuring Active Fuel Management (cylinder deactivation) to improve fuel economy during light-load driving. The L86 utilizes a robust cast iron block with aluminum cylinder heads, contributing to its durability. The overhead valve (OHV) valvetrain, while a more traditional design, is known for its reliability and simplicity. The direct injection system delivers fuel directly into the combustion chamber, enhancing efficiency and power output. Paired with this engine is the Hydra-Matic 8L90 eight-speed automatic transmission. This transmission provides a wide range of gear ratios, optimizing both acceleration and fuel efficiency. The 8L90 is electronically controlled, offering smooth and precise shifting.
Driving Characteristics
The 6.2L V8 and 8-speed automatic combination delivers a noticeable performance advantage over the lower-tier engine options in the Sierra 1500 lineup. With 420 horsepower and 459.5 lb-ft of torque, this truck offers strong acceleration and ample power for towing and hauling. The eight-speed transmission keeps the engine in its optimal power band, providing responsive performance in various driving situations. While not as fuel-efficient as the smaller engines or those with cylinder deactivation fully engaged, the 6.2L offers a satisfying balance of power and usability. The automatic transmission is well-tuned for everyday driving, with smooth shifts and a predictable response. Compared to a manual transmission equipped Sierra, the automatic prioritizes convenience and ease of use, making it ideal for drivers who frequently encounter stop-and-go traffic or long highway journeys.
Equipment & Trim Levels
The Double Cab 6.2L Automatic Sierra 1500 typically came standard with features such as air conditioning, power windows and locks, a rearview camera, and a basic infotainment system. Higher trim levels added features like leather upholstery, heated and ventilated front seats, a premium sound system, and advanced safety technologies like lane departure warning and forward collision alert. Optional extras included a sunroof, navigation system, and various appearance packages. The interior generally featured a functional and durable design, with comfortable seating and ample storage space. The Double Cab configuration offered a spacious rear seat, making it suitable for families or passengers.
Chassis & Braking
The Sierra 1500 IV utilizes a fully boxed frame for enhanced rigidity and durability. The front suspension consists of independent coil springs, while the rear suspension employs a traditional leaf spring setup. This configuration provides a comfortable ride while maintaining good load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) is standard. The steering system is a rack-and-pinion setup with electric power steering, offering precise and responsive handling.
Market Reception & Comparison
The 6.2L Sierra 1500 was generally well-received by critics and consumers alike. It was praised for its powerful engine, smooth transmission, and comfortable ride. However, its fuel economy was often cited as a drawback compared to the smaller engine options. Compared to the 5.3L V8, the 6.2L offered a significant performance boost, but at a higher price point. Against competitors like the Ford F-150 and Ram 1500, the Sierra 1500 held its own, offering a compelling combination of capability, comfort, and technology.
Legacy
The L86 6.2L EcoTec3 V8 has proven to be a relatively reliable engine, with few widespread issues reported. The Hydra-Matic 8L90 transmission is also generally considered durable. In the used car market, these Sierra 1500s remain popular choices for buyers seeking a capable and comfortable full-size pickup truck. Regular maintenance, including oil changes and fluid checks, is crucial for ensuring the long-term reliability of this powertrain. The combination of power, features, and relative dependability makes this variant a solid choice for those looking for a well-rounded and capable truck.
