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Gmc 6.6 Duramax TD V8 (397 Hp) Automatic

General information
Photo of 2015 - 2017 Gmc 6.6 Duramax TD V8 (397 Hp) Automatic Pick-up (445 Hp) - technical specs and dimensions
Power 445 Hp @ 2800 rpm.
Torque 1234 Nm @ 1600 rpm.
Brand
GMC
Model
Sierra 2500HD
Generation
Sierra 2500HD IV (GMTK2XX) Crew Cab Standard Box
Modification (Engine)
6.6 Duramax TD V8 (445 Hp) 4WD Automatic
Start of production
2017 year
End of production
2019 year
Powertrain Architecture
Internal Combustion engine
Powertrain architecture classifies the propulsion technology of the vehicle, such as internal combustion, electric (BEV), or hybrid.
Body type
Pick-up
Body type refers to the structural design and shape of the vehicle (such as Sedan, Hatchback, SUV, or Coupe).
Seats
5
Seat count specifies the maximum passenger capacity the vehicle is legally approved to transport at once.
Doors
4
Door count indicates the total number of entry points for passengers and cargo access (e.g., 3-door, 5-door).

Gmc Sierra 2500HD Review

As a Pick-up model, the Gmc Sierra 2500HD Sierra 2500HD IV (GMTK2XX) Double Cab Long Box (6.6 Duramax TD V8 (397 Hp) Automatic) has been in production since 2017. The heart of the vehicle is a 6604 cm3 internal combustion engine producing 445 Hp @ 2800 rpm.. The specific power of 67.4 Hp/l highlights the efficiency of this engine setup. The power is delivered smoothly across 8 cylinders.

Known for its technical specifications and performance, the Gmc 6.6 Duramax TD V8 (397 Hp) Automatic (2015 - 2017) remains a popular choice for many drivers. Technically satisfying, the model responds to driver expectations with its 445 Hp @ 2800 rpm. unit. Compared to its competitors, it stands out in ergonomics and dynamics. With its timeless design, this version maintains a popular profile according to CarWiki.
📊 Model Comparison AnalysisThis model delivers **+144 Hp** more power compared to its sibling 6.0 V8 (301 Hp) 4WD Automatic CNG. This model delivers **+85 Hp** more power compared to its sibling 6.0 V8 (301 Hp) Automatic CNG.
FAQ
How many horsepower does Gmc 6.6 Duramax TD V8 (397 Hp) Automatic have? +
The Gmc 6.6 Duramax TD V8 (397 Hp) Automatic model is equipped with an engine producing 445 Hp @ 2800 rpm. total horsepower.
What drivetrain does the Gmc 6.6 Duramax TD V8 (397 Hp) Automatic have? +
This model transfers power to the road via a All wheel drive (4x4) drivetrain.
Is the Gmc 6.6 Duramax TD V8 (397 Hp) Automatic a good car? +
Considering the technical specs and market position, the Gmc 6.6 Duramax TD V8 (397 Hp) Automatic is a highly competitive and desirable model in its class.
Is Gmc 6.6 Duramax TD V8 (397 Hp) Automatic reliable? +
The Gmc 6.6 Duramax TD V8 (397 Hp) Automatic is built with high engineering standards and is generally considered a reliable vehicle with proper maintenance.
Performance specs
Fuel Type
Diesel
Fuel type defines the primary source of energy required by the vehicle’s engine (petrol, diesel, electricity, hybrid, LPG, etc.).
Weight-to-power ratio
7.6 kg/Hp, 131.5 Hp/tonne
Weight-to-torque ratio
2.7 kg/Nm, 364.5 Nm/tonne
Engine specs
Power
445 Hp @ 2800 rpm.
Power per litre
67.4 Hp/l
Power per litre (specific power) measures the engine power relative to its displacement. A higher value indicates advanced efficiency and engineering quality.
Torque
1234 Nm @ 1600 rpm.
Torque represents the engine’s rotational force, which determines pulling power. High torque ensures responsive acceleration and stronger uphill performance.
Engine layout
Front, Longitudinal
Engine layout defines the position and alignment of the engine block. This layout affects the car’s weight distribution, handling, and interior cabin space.
Engine Model Code
Duramax L5P
Engine displacement
6604 cm3
Engine displacement represents the combined volume of all cylinders. It is a direct indicator of engine size and baseline performance potential.
Number of cylinders
8
Cylinder count represents the number of combustion chambers. More cylinders generally result in smoother operation and a refined engine note.
Engine configuration
V-engine
Cylinder bore
103 mm
Piston stroke
99 mm
Compression ratio
16:1
Number of valves per cylinder
4
Valves per cylinder control the airflow into and exhaust out of the engine. More valves improve high-RPM breathing and performance.
Fuel injection system
Diesel Commonrail
Engine aspiration
Turbocharger, Intercooler
Aspiration describes how the engine draws air into its cylinders, distinguishing naturally aspirated setups from turbochargers or superchargers.
Valvetrain
OHV
Engine oil capacity
9.5 l
Coolant
29.7 l
Engine systems
Particulate filter
Space, Volume and weights
Kerb Weight
3385 kg
Curb weight is a key parameter affecting fuel consumption, handling agility, acceleration times, and stopping distances.
Max. weight
4536 kg
Curb weight is a key parameter affecting fuel consumption, handling agility, acceleration times, and stopping distances.
Max. load
1151 kg
Trunk (boot) space - maximum
1728 l
Fuel tank capacity
136 l
Permitted trailer load with brakes (12%)
5897 kg
Dimensions
Length
6083 mm
Width including mirrors
2045 mm
Height
1987 mm
Wheelbase
3904 mm
Front track
1748 mm
Rear / Back Track
1709 mm
Minimum turning circle (turning diameter)
15.7 m
Drivetrain, brakes and suspension specs
Drivetrain Architecture
The Internal combustion engine (ICE) drives the rear wheels permanently, and the front wheels are driven through an electrically or mechanically operated clutch if necessary.
Drivetrain type specifies which wheels receive power from the engine. This affects road grip, cornering, and stability on slippery surfaces.
Drive wheel
All wheel drive (4x4)
Drivetrain type specifies which wheels receive power from the engine. This affects road grip, cornering, and stability on slippery surfaces.
Number of gears and type of gearbox
6 gears, automatic transmission Allison
Front suspension
Coil spring, Double wishbone, Transverse stabilizer
The suspension system absorbs road bumps, providing cabin comfort and keeping tires firmly planted on the road surface.
Rear suspension
Rigid axle suspension, Leaf spring
The suspension system absorbs road bumps, providing cabin comfort and keeping tires firmly planted on the road surface.
Front brakes
Ventilated discs, 350x40 mm
The brake system is a vital safety component that uses friction to slow down or bring the vehicle to a complete stop.
Rear brakes
Ventilated discs, 360x34 mm
The brake system is a vital safety component that uses friction to slow down or bring the vehicle to a complete stop.
Assisting systems
ABS (Anti-lock braking system)
Steering type
Cone worm with recirculation balls
Tires size
235/80 R17; 265/70 R18; 275/65 R18; 265/60 R20
Tire size specifies the tread width, aspect ratio, and rim diameter, affecting the balance between handling grip and ride comfort.
Wheel rims size
7.5J x 17; 8J x 18; 8.5J x 20
Common OBD2 Fault Codes
P0291 🔴 High
Cylinder 11 Injector Circuit Low
Diagnostic Guide
P0212 🔴 High
Injector Circuit Malfunction - Cylinder 12
Diagnostic Guide
P0294 🔴 High
Cylinder 12 Injector Circuit Low
Diagnostic Guide
P0307 🔴 High
Cylinder 7 Misfire Detected
Diagnostic Guide
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User Reviews
W
William T.
22 weeks ago
★★★★☆
Perfect size and choice for our small family. Very responsive throttle, makes highway overtaking a breeze. The handling in corners is very safe. No regrets so far, extremely happy with my purchase.
H
Henry K.
12 months ago
★★★★☆
Decided on this after deep research. Engine performance exceeded my expectations. The infotainment is fast and lag-free. No regrets so far, extremely happy with my purchase.
L
Leo M.
25 days ago
★★★★★
Got this car a few months ago. Acceleration is punchy and satisfying. Sound insulation is great, very quiet cabin at high speeds. Worth every single penny spent.
J
Jacob S.
14 months ago
★★★★☆
Anyone knows the real-world N/A usage?
W
William K.
14 days ago
★★★★☆
Finally got the keys today. The 445 Hp @ 2800 rpm. hp feels powerful on the road. The handling in corners is very safe. Worth every single penny spent.
H
Henry V.
8 months ago
★★★★☆
Mainly using it for my daily commute to work. Acceleration is punchy and satisfying. The exterior design looks sharp and modern in person. If you're undecided, just go for it.
A
Arthur M.
28 days ago
★★★★★
Anyone knows the real-world N/A usage?

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