GMC Sierra 2500 HD 2021 Getting To Know Your Manual

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Year 2021

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GMC Sierra 2500 HD 2021 Specification

The GMC Sierra 2500 HD 2021 is a heavy-duty truck designed for robust performance, advanced technology, and superior comfort. This model is powered by a choice of two engines: the standard 6.6L V8 gasoline engine generating 401 horsepower and 464 lb-ft of torque, and an optional 6.6L Duramax Turbo-Diesel V8 engine that delivers 445 horsepower and a remarkable 910 lb-ft of torque. Both engines are paired with a 6-speed automatic transmission, although the Duramax Diesel variant offers a 10-speed automatic transmission for enhanced efficiency and towing capabilities.

The Sierra 2500 HD features a high-strength steel frame, ensuring durability and stability under heavy loads. It boasts a maximum towing capacity of up to 18,500 pounds when properly equipped, and a payload capacity exceeding 3,700 pounds. The truck is available in several trims, including the base model, SLE, SLT, AT4, and the luxurious Denali, each offering varying levels of comfort and technology.

Inside, the Sierra 2500 HD emphasizes comfort and connectivity with features such as a spacious cabin, premium materials, and advanced infotainment systems. The standard 8-inch diagonal GMC Infotainment System includes Apple CarPlay and Android Auto compatibility, along with available wireless charging and a Bose premium audio system in higher trims. Driver assistance technologies include available features like lane departure warning, forward collision alert, and a multi-view camera system to facilitate maneuvering and enhance safety.

The exterior design of the Sierra 2500 HD is both functional and stylish, featuring an imposing grille, LED lighting, and an innovative six-function MultiPro Tailgate. This tailgate offers versatility for loading and unloading cargo, making it an invaluable tool for both work and recreation. The truck's design is complemented by a range of available wheel options and exterior color choices, allowing buyers to customize their vehicle to suit their preferences and needs.

GMC Sierra 2500 HD 2021 F.A.Q.

How do I reset the oil life monitor on my GMC Sierra 2500 HD 2021?

To reset the oil life monitor, turn the ignition to the "On" position without starting the engine. Use the DIC menu buttons on the steering wheel to navigate to "Oil Life" and press the checkmark button to reset.

What is the recommended tire pressure for the GMC Sierra 2500 HD 2021?

The recommended tire pressure for the GMC Sierra 2500 HD 2021 can vary based on load and tire size, but generally, it is around 60 psi for the front tires and 75 psi for the rear tires. Always check the driver's door placard for the specific recommended values.

How do I engage four-wheel drive on the GMC Sierra 2500 HD 2021?

To engage four-wheel drive, shift the transfer case dial to the desired setting (4HI or 4LO) while the vehicle is fully stopped and the transmission is in neutral. Wait for the 4WD indicator light to illuminate.

How can I check the transmission fluid level in my GMC Sierra 2500 HD 2021?

To check the transmission fluid, the vehicle should be on a level surface and the engine should be at operating temperature. With the engine running, shift through all the gears, then place it in park. Remove the dipstick, wipe it clean, reinsert it, and then remove it again to check the fluid level.

What type of coolant is recommended for the GMC Sierra 2500 HD 2021?

The recommended coolant is a 50/50 mixture of DEX-COOL coolant and clean, drinkable water. Always ensure the coolant system is properly filled to maintain engine temperature.

How do I pair my smartphone with the GMC Sierra 2500 HD 2021's infotainment system?

To pair your smartphone, enable Bluetooth on your phone, then access the Bluetooth menu on the infotainment system. Select "Add Phone" and choose your phone from the list. Follow the on-screen instructions to complete the pairing process.

What should I do if the check engine light comes on in my GMC Sierra 2500 HD 2021?

If the check engine light comes on, check for any obvious issues such as a loose gas cap. If the light remains on, have the vehicle's diagnostic codes read with an OBD-II scanner to determine the issue. Consult a professional mechanic if necessary.

How often should I change the air filter in my GMC Sierra 2500 HD 2021?

The air filter should be checked every 15,000 miles and replaced if necessary. However, if you frequently drive in dusty or harsh conditions, more frequent checks and replacements may be required.

How do I calibrate the tire pressure monitoring system (TPMS) on the GMC Sierra 2500 HD 2021?

To recalibrate the TPMS, inflate all tires to the recommended pressure. Use the DIC menu to select the "Tire Pressure" display, then press and hold the checkmark button to begin the recalibration process.

What is the towing capacity of the GMC Sierra 2500 HD 2021?

The towing capacity of the GMC Sierra 2500 HD 2021 can be up to 18,500 pounds when properly equipped. It's important to verify the specific configuration of your vehicle for exact towing capabilities.