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2021 GMC Sierra
Vehicle Summary
The 2021 GMC Sierra 3500 Denali is a robust pickup truck designed for heavy-duty performance. It features a powerful 6.6-liter V8 Duramax diesel engine with a turbocharger, delivering impressive power for demanding tasks. The truck offers a 4WD system for enhanced off-road capability and safety features such as curtain airbags for all rows and direct tire pressure monitoring. Built in Flint, Michigan, this crew cab model combines rugged capability with luxury touches typical of the Denali trim.
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2021 GMC Sierra
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Complete Specifications
Known Issues for This Vehicle
Brake pedal feels spongy
A spongy brake pedal in a hydraulic brake system can indicate air in the brake lines or worn brake fluid, which reduces the system's effectiveness.
Engine overheating
V-shaped engines like the L5P Duramax can experience overheating due to issues like clogged radiators or faulty thermostats, especially under heavy towing conditions.
Dpf clogging
The L5P Duramax engine's Diesel Particulate Filter can become clogged if the vehicle is frequently driven short distances, preventing proper regeneration.
Turbocharger issues
Turbocharger failure in the L5P Duramax may occur due to excessive soot buildup or oil contamination, leading to decreased performance or turbo lag.
Fuel injector problems
These engines can suffer from fuel injector issues, such as leaks or clogs, resulting in poor fuel economy or rough idling.
Transmission shudder
GMC Sierras may experience transmission shudder due to torque converter issues or the need for a transmission fluid change, especially in vehicles frequently used for towing.
