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2018 GMC Sierra
Vehicle Summary
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.
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2018 GMC Sierra
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Complete Specifications
Known Issues for This Vehicle
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.
