The GMC Sierra 1500 IV (GMTK2XX) Double Cab, equipped with the 4.3 EcoTec3 V6 engine and a four-wheel-drive automatic transmission, was a popular configuration within the Sierra 1500 lineup produced from 2013 to 2015. This variant represented a balance between capability, fuel efficiency, and affordability, targeting buyers who needed a versatile pickup truck for both work and personal use. It occupied a mid-range position in the Sierra 1500 family, slotting below the more powerful 5.3L and 6.2L V8 options, but offering a more economical alternative. The “FlexFuel” designation indicated the engine’s capability to run on gasoline or a blend of up to 85% ethanol (E85).
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 IV (GMTK2XX) Double Cab |
| Type (Engine) | 4.3 EcoTec3 V6 (285/297 Hp) 4WD Automatic FlexFuel |
| Start of production | 2013 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 13.8 l/100 km (17 US mpg) |
| Fuel consumption (extra urban) | 10.7 l/100 km (22 US mpg) |
| Fuel Type | Petrol / Ethanol – E85 |
| Weight-to-power ratio | 8.1 kg/Hp |
| Weight-to-torque ratio | 5.6 kg/Nm |
| Power | 285 Hp @ 5300 rpm |
| Power (Ethanol – E85) | 297 Hp @ 5300 rpm |
| Torque | 413 Nm @ 3900 rpm (304.61 lb.-ft. @ 3900 rpm) |
| Torque (Ethanol – E85) | 447 Nm @ 3900 rpm |
| Maximum engine speed | 5800 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LV3 |
| Engine displacement | 4300 cm3 (262.4 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 99.6 mm (3.92 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 5.7 l (6.02 US qt | 5.02 UK qt) |
| Coolant capacity | 14 l (14.79 US qt | 12.32 UK qt) |
| Kerb Weight | 2315 kg (5103.7 lbs.) |
| Max. weight | 3220 kg (7098.88 lbs.) |
| Max load | 905 kg (1995.18 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%) | 2721 kg (5998.78 lbs.) |
| Length | 5829 mm (229.49 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) | 225 mm (8.86 in.) |
| Minimum turning circle (turning diameter) | 14.3 m (46.92 ft.) |
| Approach angle | 17° |
| Departure angle | 23.1° |
| Ramp-over (brakeover) angle | 19.1° |
| Drivetrain Architecture | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 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 | 245/70 R17; 265/70 R17 |
| Wheel rims size | 8J x 17 |
Powertrain & Engine Architecture
The heart of this Sierra 1500 variant is the 4.3L (262 cubic inch) EcoTec3 V6 engine, designated as the LV3. This engine is a naturally aspirated, 90-degree V6 featuring direct fuel injection, a variable valve timing system, and cylinder deactivation technology. The direct injection system optimizes fuel delivery and combustion efficiency, while cylinder deactivation allows the engine to operate on fewer cylinders during light-load conditions, further improving fuel economy. The OHV (Overhead Valve) valvetrain design, while traditional, contributes to the engine’s durability and relatively simple maintenance. The 4L80-E four-speed automatic transmission, a Hydra-Matic unit, was paired with this engine. While not the most modern transmission in terms of gear count, it was known for its robustness and ability to handle the torque output of the V6. The transmission’s gear ratios were optimized for towing and hauling, prioritizing low-end grunt over outright acceleration.
Driving Characteristics
The 4.3L V6 with the four-speed automatic provided adequate, though not exhilarating, performance. Acceleration was sufficient for everyday driving and moderate towing, but it lacked the punch of the larger V8 engines. The automatic transmission’s shift points were generally smooth, but could feel somewhat dated compared to newer transmissions with more gears. The lower gear ratios helped with initial acceleration and towing capacity, while the higher gears aimed to improve fuel economy on the highway. Compared to the 5.3L V8, this variant felt noticeably less powerful, especially when fully loaded or climbing hills. However, it offered a more refined and quieter driving experience, and significantly better fuel economy. The four-wheel-drive system provided enhanced traction in inclement weather and on unpaved surfaces.
Equipment & Trim Levels
The 4.3L Double Cab typically came standard with features like air conditioning, power windows and locks, a basic audio system, and cloth upholstery. Higher trim levels, such as SLE and SLT, added features like leather upholstery, heated seats, a premium audio system, and advanced safety features. Optional extras included a navigation system, a sunroof, and various towing packages. The Double Cab configuration offered a spacious interior with seating for five passengers and a usable rear seat. The interior design was functional and durable, with a focus on practicality rather than luxury.
Chassis & Braking
The Sierra 1500 IV utilized a body-on-frame construction, providing a robust and durable platform. The front suspension featured independent coil springs, while the rear suspension employed a traditional leaf spring setup. This configuration was designed to handle heavy loads and provide a comfortable ride. The braking system consisted of ventilated discs on all four wheels, with ABS (Anti-lock Braking System) as standard equipment. The rear brakes were slightly smaller in diameter than the front brakes. The steering system was a rack-and-pinion setup with electric power steering, providing responsive and precise handling.
Market Reception & Comparison
The 4.3L EcoTec3 V6-powered Sierra 1500 Double Cab was generally well-received by critics as a practical and affordable option in the full-size pickup truck segment. It was praised for its fuel efficiency, comfortable ride, and spacious interior. However, some reviewers noted its lack of power compared to the V8 models. In terms of fuel economy, the 4.3L variant consistently outperformed the V8 options, making it an attractive choice for buyers who prioritized efficiency. Reliability was generally good, with the EcoTec3 engine proving to be a durable and dependable powerplant. Compared to competitors like the Ford F-150 and Ram 1500 with similar engine displacements, the Sierra 1500 offered a competitive combination of features, performance, and price.
Legacy
The 4.3L EcoTec3 V6 engine and the 4L80-E transmission have proven to be relatively reliable powertrains. While not without their occasional issues (such as oil leaks and transmission solenoid failures), these components generally hold up well over time with proper maintenance. In the used car market, the 2013-2015 Sierra 1500 Double Cab with the 4.3L V6 represents a good value proposition for buyers seeking a capable and affordable pickup truck. Its fuel efficiency and relatively low maintenance costs make it an attractive option for those who don’t require the extra power of the V8 models. The availability of four-wheel drive adds to its versatility, making it suitable for a wide range of applications.
