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The 2018 GMC Sierra 3500 Denali is a robust crew cab pickup with a 6.6L V8 Duramax diesel engine, producing impressive power and torque. Equipped with a 4WD system, it is designed for heavy-duty tasks, with a gross vehicle weight rating of up to 14,000 lbs. Safety features include front, side, and curtain airbags across all rows, along with a direct tire pressure monitoring system. Built in Flint, Michigan, this model is tailored for both performance and luxury.

Decoded VIN:

Make

GMC

Manufacturer Name

GENERAL MOTORS LLC

Model

Sierra

Model Year

2018

Plant City

FLINT

Series

3500

Trim

Denali

Vehicle Type

TRUCK

Plant Country

UNITED STATES (USA)

Plant Company Name

GMNA

Plant State

MICHIGAN

Body Class

Pickup

Doors

Gross Vehicle Weight Rating From

Class 3: 10,001 - 14,000 lb (4,536 - 6,350 kg)

Cab Type

Crew/Super Crew/Crew Max

Drive Type

4WD/4-Wheel Drive/4x4

Brake System Type

Hydraulic

Engine Number of Cylinders

Displacement (CC)

6600.0

Displacement (CI)

402.75671102523

Displacement (L)

6.6

Engine Model

L5P - Direct Injection, DURAMAX, GEN 5, VAR 1

Fuel Type - Primary

Diesel

Engine Configuration

V-Shaped

Turbo

Yes

Seat Belt Type

Manual

Curtain Air Bag Locations

All Rows

Front Air Bag Locations

1st Row (Driver and Passenger)

Side Air Bag Locations

1st Row (Driver and Passenger)

Tire Pressure Monitoring System (TPMS) Type

Direct

Most common problems:

Brake fluid leaks

Hydraulic brake systems rely on fluid to function properly, and leaks can lead to reduced braking performance.

Spongy brake pedal

Air in the hydraulic brake lines can cause the brake pedal to feel spongy, reducing braking efficiency.

Brake wear

Brake pads and rotors can wear out over time, leading to reduced braking performance and the need for replacement.

Fuel injector issues

Direct injection engines like the L5P can experience problems with fuel injectors, including clogging or failure.

Turbocharger problems

The L5P DURAMAX engine uses a turbocharger, which can suffer from issues such as lag, overboost, or failure.

Diesel particulate filter (dpf) clogging

Diesel engines with DPF systems can experience clogging, leading to reduced performance and the need for regeneration or cleaning.

Glow plug failure

Diesel engines rely on glow plugs for cold starts, and failure can make starting the engine difficult in cold weather.

Exhaust gas recirculation (egr) valve problems

EGR valves can become clogged or fail, leading to increased emissions and reduced engine performance.

Cooling system issues

The V-shaped engine configuration can lead to hot spots in the cooling system, causing overheating or coolant leaks.

Fuel system contamination

Diesel engines can suffer from fuel contamination, leading to injector or fuel pump damage.

Transmission problems

The GMC Sierra can experience issues with transmission shifting, especially in higher-mileage vehicles.

Electrical issues

Modern vehicles, including the 2018 GMC Sierra, can suffer from electrical problems such as sensor failures or wiring issues.

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