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The 2021 GMC Silverado Medium Duty (GM515) is a robust truck designed for demanding tasks, featuring a set-forward axle configuration and a conventional cab. It's powered by a 6.6-liter V8 diesel engine from GM, equipped with a turbocharger for enhanced performance. The truck boasts a 4WD system, making it suitable for various terrains and work environments. Built by NAVISTAR, INC. in Springfield, Ohio, this vehicle falls within the Class 6 weight category, supporting a gross vehicle weight rating from 19,501 to 26,000 pounds.

Decoded VIN:

Make

GMC

Manufacturer Name

NAVISTAR, INC.

Model

Silverado Medium Duty (GM515)

Model Year

2021

Plant City

SPRINGFIELD

Series

Vehicle Type

INCOMPLETE VEHICLE

Plant Country

UNITED STATES (USA)

Plant State

OHIO

Body Class

Truck

Gross Vehicle Weight Rating From

Class 6: 19,501 - 26,000 lb (8,845 - 11,794 kg)

Cab Type

MDHD: Conventional

Drive Type

4WD/4-Wheel Drive/4x4

Axle Configuration

SFA - Set-Forward Axle

Brake System Type

Hydraulic

Engine Number of Cylinders

Displacement (CC)

6600.0

Displacement (CI)

402.75671102523

Displacement (L)

6.6

Fuel Type - Primary

Diesel

Engine Configuration

V-Shaped

Other Engine Info

DI, DURAMAX, GEN 5, VAR.3

Turbo

Yes

Engine Manufacturer

Most common problems:

Brake fluid leaks

Hydraulic brake systems can suffer from leaks in the brake lines or seals, which can lead to reduced braking performance and increased stopping distances.

Brake pedal feels spongy

Air can enter the hydraulic brake system, causing the brake pedal to feel soft or spongy, which can affect braking efficiency.

Overheating engine

The V-shaped, 8-cylinder GM Duramax engine may experience overheating due to issues such as a failing thermostat, blocked radiator, or coolant leaks.

Fuel injector problems

The direct injection (DI) systems in Duramax engines can face issues with clogged or malfunctioning fuel injectors, leading to poor engine performance and reduced fuel efficiency.

Timing chain wear

Over time, the timing chain in V8 engines can stretch or wear, leading to timing issues that can affect engine performance.

Exhaust gas recirculation (egr) valve issues

The EGR system can become clogged with carbon deposits, which can lead to reduced engine performance and increased emissions.

Turbocharger failure

Duramax engines equipped with a turbocharger can experience failure due to oil contamination, bearing wear, or damage to the turbine, leading to reduced power output.

Diesel particulate filter (dpf) clogging

The DPF can become clogged with soot and ash, causing increased backpressure and reduced engine performance.

Sensor malfunctions

Various sensors (e.g., oxygen sensors, mass airflow sensor) in the engine can fail or provide incorrect readings, leading to poor engine performance.

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