2016-2018 GMC Sierra 1500 IV (GMTK2XX facelift ) Double Cab 4.3 EcoTec3 V6 (285297 Hp) Automatic FlexFuel

The GMC Sierra 1500 IV, specifically the Double Cab configuration with the 4.3 EcoTec3 V6 engine and automatic transmission, represents a significant iteration in GMC’s full-size pickup truck lineage. Produced from 2016 to 2018 as part of the GMTK2XX platform’s facelift, this variant aimed to balance capability with efficiency and affordability within the Sierra 1500 range. It served as a popular choice for buyers seeking a versatile truck for both work and personal use, offering a step up from the base engine while remaining more accessible than the larger V8 options. This model year saw updates to the exterior styling, interior features, and technology, enhancing its overall appeal in a competitive segment.

Technical Specifications

INTRODUCTION

The 2016-2018 GMC Sierra 1500 Double Cab equipped with the 4.3 EcoTec3 V6 and automatic transmission occupied a crucial middle ground in the Sierra lineup. Positioned above the base 2.7L four-cylinder engine, it offered a significant power increase without the higher price tag and fuel consumption associated with the 5.3L and 6.2L V8 options. The Double Cab body style provided increased rear passenger space compared to the standard cab, making it suitable for families or crews. This variant was primarily sold in the North American market, catering to buyers who needed a capable truck for everyday use, light hauling, and towing.

Powertrain & Engine Architecture

The heart of this Sierra 1500 is the 4.3L (262.4 cubic inch) EcoTec3 V6 engine, designated as the LV3. This engine is a naturally aspirated, direct-injected powerplant featuring a 60-degree V-angle. Direct injection allows for precise fuel delivery, improving efficiency and power output. The engine utilizes an overhead valve (OHV) valvetrain with two valves per cylinder. A key feature of the EcoTec3 family is Active Fuel Management (AFM), also known as cylinder deactivation, which shuts down two cylinders under light load conditions to conserve fuel. The engine is capable of running on gasoline or E85 flex fuel, with a slight power increase (297 hp) when using E85. The engine is paired with the Hydra-Matic 6L80 six-speed automatic transmission, known for its smooth shifting and durability. This transmission features electronically controlled shifting and overdrive for improved fuel economy at highway speeds.

Driving Characteristics

The 4.3L V6, producing 285 horsepower and 305 lb-ft of torque, provided adequate power for most everyday driving situations. While not as quick as the V8 models, it offered a respectable acceleration and towing capacity. The six-speed automatic transmission was well-tuned, providing smooth and predictable shifts. The gear ratios were optimized for both towing and fuel efficiency. Compared to the 5.3L V8, the 4.3L felt less powerful, especially when fully loaded or towing a heavy trailer. However, it offered better fuel economy and a more refined driving experience. The rear-wheel-drive configuration provided a traditional truck feel, while four-wheel drive was available as an option for improved traction in inclement weather.

Equipment & Trim Levels

The 4.3L Double Cab Sierra 1500 was typically offered in SLE and SLT trim levels. The SLE trim included standard features such as air conditioning, power windows and locks, a basic infotainment system with a touchscreen display, and cloth upholstery. The SLT trim added features like leather upholstery, heated front seats, a premium audio system, and additional chrome exterior trim. Optional extras included a navigation system, a sunroof, and various safety features like lane departure warning and forward collision alert. Interior materials were generally durable and functional, reflecting the truck’s work-oriented nature. The Double Cab configuration offered ample space for five passengers, with comfortable seating and a usable rear seat.

Chassis & Braking

The Sierra 1500 IV utilized a fully boxed frame for enhanced rigidity and durability. The front suspension consisted of independent coil springs, while the rear suspension employed a traditional leaf spring setup. This configuration provided a comfortable ride and good load-carrying capacity. Braking duties were handled by ventilated disc brakes on all four wheels, with ABS (Anti-lock Braking System) standard. The rear brakes were slightly smaller in diameter than the front brakes. Steering was rack-and-pinion with electric power steering, providing responsive handling and ease of maneuverability. Tire sizes varied depending on the trim level, with 245/70R17 and 265/70R17 being common options.

Market Reception & Comparison

Critics generally praised the 4.3L EcoTec3 V6 for its fuel efficiency and adequate power. It was seen as a good alternative to the V8 engines for buyers who didn’t require maximum towing capacity or performance. However, some reviewers noted that the engine could feel strained when hauling heavy loads or climbing steep hills. Compared to the 5.3L V8, the 4.3L offered better fuel economy (around 18 mpg city and 24 mpg highway) but less overall power and towing capacity. The 4.3L also had a reputation for being relatively reliable, with fewer reported issues compared to some of the more complex V8 engines.

Legacy

The 4.3L EcoTec3 V6-powered Sierra 1500 has proven to be a relatively reliable and durable truck in the used car market. The engine is known for its longevity, and the Hydra-Matic 6L80 transmission is also considered to be robust. Common maintenance items include regular oil changes, spark plug replacements, and transmission fluid flushes. These trucks continue to be popular choices for buyers seeking an affordable and capable full-size pickup. While not as sought after as the V8 models, the 4.3L Sierra 1500 offers a good balance of value, efficiency, and practicality, making it a solid choice for a variety of applications.