How to Replace the Battery in Your 2021 GMC Sierra Key Fob: Step-by-Step Guide

Ever found yourself locked out of your GMC Sierra because the key fob battery died at the worst possible moment? Frustrating, right? But don’t worry, you’re not alone. In this article, we’ll walk you through the simple steps to change the battery in your 2021 GMC Sierra key fob.

Imagine being able to swiftly replace the battery in your key fob without any hassle. No more last-minute panics or unexpected lockouts. By mastering this quick and easy process, you’ll regain control and peace of mind when it comes to your vehicle’s key fob.

Locate the Battery Compartment

When changing the battery in your 2021 GMC Sierra key fob, the first step is to find the battery compartment. Here’s how you can easily locate it:

  • Check the Key Fob: Examine your key fob closely. The compartment is usually in a small groove or a slot on the fob.
  • Look for a Notch: There might be a tiny opening on the side where you can insert a small tool to pop open the cover.
  • Inspect the Key Fob’s Surface: Sometimes, the compartment is seamlessly integrated into the design, requiring a gentle push or slide to access it.

Remember, locating the battery compartment is the initial and crucial step in your journey to replace the battery in your GMC Sierra key fob.

Remove the Old Battery

When it’s time to replace the battery in your 2021 GMC Sierra key fob, removing the old battery is the next crucial step to ensure your key fob functions properly. Here’s how you can do it:

  • Locate the Battery Compartment: Begin by finding the battery compartment on your key fob. Once you’ve identified it, you can move on to the next steps.
  • Open the Cover: To access the old battery, you’ll need to open the cover of the key fob. Look for a small groove, slot, or notch that indicates where you can insert a tool to gently pry open the cover.
  • Carefully Remove the Old Battery: Once you’ve opened the cover, you’ll see the old battery inside. Take care not to damage any components around the battery as you remove it. Use a tool or your fingers to safely take out the old battery.
  • Dispose of the Old Battery Properly: Make sure to dispose of the old battery in an environmentally friendly way. Consider recycling it at a local facility that accepts used batteries to minimize environmental impact.
  • Clean the Battery Compartment: Before inserting the new battery, take a moment to clean the inside of the battery compartment. This ensures a good connection with the new battery and helps maintain the key fob’s performance.
  • Prepare for Installing the New Battery: With the old battery out and the compartment clean, you’re now ready to proceed with installing the new battery. Take your time to ensure everything is in place before closing the cover.
  • Next Steps: Once you’ve successfully removed the old battery, you’re one step closer to completing the battery replacement process for your GMC Sierra key fob. Your proactive approach will soon have your key fob functioning like new.

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Insert the New Battery

When inserting the new battery into your 2021 GMC Sierra key fob, make sure to align it properly in the compartment. Avoid forcing the battery; it should fit snugly but smoothly. Check the orientation marks to ensure you insert it correctly. Once done, close the cover securely to guarantee proper functioning of the key fob.

Step Description
1. Align the new battery
2. Avoid forcing it
3. Check orientation marks
4. Close the cover securely

Test the Key Fob

Once you’ve replaced the battery in your 2021 GMC Sierra key fob, it’s crucial to test it to ensure everything is functioning as it should. Here’s how you can do it:

  • Step 1: Stand close to your vehicle and press the buttons on the key fob.
  • Step 2: Check if the doors lock and unlock as intended.
  • Step 3: Test the remote start function, if applicable.
  • Step 4: Confirm that the panic alarm works when you press the corresponding button.

Testing the key fob after a battery replacement is essential to verify that the new battery is properly installed and that the key fob’s functions are working correctly.

Reassemble the Key Fob

To reassemble the key fob after replacing the battery:

  • Insert the Key Fob Circuit Board: Place the circuit board back into the key fob shell, ensuring it fits snugly.
  • Reattach the Key Fob Cover: Align the cover with the key fob shell, making sure all edges are correctly lined up.
  • Press Firmly and Securely: Press down on the cover until you hear it click into place, indicating it is securely closed.
  • Test for Functionality: Ensure all buttons are responsive by pressing each one to confirm they are working properly.
  • Check for Proper Alignment: Verify that the cover is flush with the key fob shell on all sides to prevent any issues with its functionality.

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Important Tips:
Always handle the key fob components gently to avoid damage.
Double-check the alignment marks to ensure everything is positioned correctly.


You now have all the necessary steps to confidently change the battery in your 2021 GMC Sierra key fob. Remember to handle the components gently, ensure proper alignment, and thoroughly test the button functionality. By following these guidelines, you can maintain the optimal performance of your key fob. Don’t forget to securely close and align the cover to prevent any potential issues. Keep in mind the importance of double-checking alignment marks and handling components with care throughout the process. With these tips, you’ll have your key fob up and running smoothly in no time.

Frequently Asked Questions

1. How can I replace the battery in my 2021 GMC Sierra key fob?

To replace the battery in your 2021 GMC Sierra key fob, follow these steps: gently open the key fob using a flathead screwdriver, remove the old battery, and insert a new CR2032 battery with the positive side facing up. Close the key fob securely ensuring it aligns properly, and test the buttons for functionality.

2. What is the importance of proper alignment during reassembly?

Proper alignment during reassembly is crucial to ensure all components fit together correctly, preventing any issues with button functionality or the key fob’s structure. Misalignment could lead to difficulty in closing the cover securely or affect the key fob’s overall performance.

3. How can I test if the key fob is functioning correctly after replacing the battery?

After replacing the battery and reassembling the key fob, test all buttons to ensure they work correctly. If any buttons are unresponsive, double-check the alignment of components, and ensure the cover is securely closed and flush with the key fob shell. If issues persist, consider replacing the battery again or seeking professional assistance.

Battery industry professional with 5+ years of experience. Bachelor of Science in Electrical Engineering from Georgia Tech. Specializes in power systems and renewable energy.

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