Is your 2021 GMC Sierra key fob not working? Don’t worry, you’re not alone. One of the most common reasons for a key fob malfunction is a dead battery. The good news is, replacing the battery in your GMC Sierra key fob is a straightforward process you can easily do yourself. This guide will walk you through each step, ensuring you get your key fob back in working order quickly.
Most GMC Sierra key fobs, including those for the 2021 model, use a CR2032 3-volt battery. These batteries are known for their longevity, typically lasting 3 to 4 years. However, when it’s time for a replacement, you won’t need to visit a dealership. You can find CR2032 batteries at most drugstores, supermarkets, and online retailers. For this DIY task, you’ll only need a couple of simple tools: a new CR2032 battery and a small flathead screwdriver.
Here’s how to replace your 2021 GMC Sierra key fob battery:
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Prepare Your Key Fob and Tools: Gather your new CR2032 battery and a small flathead screwdriver. Place your GMC Sierra key fob on a clean, flat surface.
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Open the Key Fob Casing: Locate the small notch on the side of your GMC Sierra key fob. Gently insert the flathead screwdriver into this notch. Apply a slight twisting motion to carefully pry the key fob casing open. Be patient and avoid using excessive force to prevent damage to the casing.
Alt text: Close-up of a 2021 GMC Sierra key fob highlighting the notch for battery replacement access.
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Access the Battery: Once the casing is open, you’ll see the internal components and the CR2032 battery. Take note of the battery’s orientation, specifically which side is facing up (+ or -), before removal. This will ensure you insert the new battery correctly.
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Remove the Old Battery: Carefully remove the dead CR2032 battery. You may be able to gently pry it out with your fingertip or the edge of the flathead screwdriver if needed.
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Insert the New Battery: Install the new CR2032 battery, making sure the polarity matches the original battery’s orientation. Typically, the positive (+) side faces upwards or towards the back cover of the key fob.
Alt text: Hands using a flathead screwdriver to open the casing of a 2021 GMC Sierra key fob for battery replacement.
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Reassemble the Key Fob: Carefully align the two halves of the key fob casing and snap them back together. Ensure the casing is securely closed.
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Test Your Key Fob: Press a button on your key fob to test if it’s working. The doors should lock or unlock, or the panic alarm should sound, depending on the button pressed.
In most cases, replacing the battery will solve the issue and restore your 2021 GMC Sierra key fob to full functionality. However, if your key fob still doesn’t work after a battery replacement, there might be a more complex issue. In such instances, it’s recommended to contact a certified GMC technician for further diagnosis and repair. You can also explore more helpful guides and resources for your GMC Sierra and key fob maintenance at keyfobx.com.
