How to Fix Honda Key Fob: Troubleshooting the Battery Issue

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Are you struggling with a dead key fob for your Honda Odyssey? Don’t worry, we’ve got you covered! In this article, we will guide you through the troubleshooting process to fix your Honda key fob. This step-by-step guide will not only save you hundreds of dollars but also apply to other cars and electronics. So, let’s dive right in and get your key fob working again!

Key Reasons for Key Fob Failure

There are a few common reasons why your Honda key fob might not be working properly:

  1. Dead Battery
  2. Poor Connection
  3. Poorly Designed Battery Structure

Let’s explore each of these issues in detail and learn how to address them effectively.

Step 1: Checking the Battery

To begin troubleshooting your key fob, it’s essential to check the battery first. Not all batteries are created equal, and a dead battery could be the primary cause behind your key fob malfunction.

  1. Open the Honda Odyssey key fob using a small key or tool.
  2. Once the key fob is open, you’ll find a CR2032 battery inside.
  3. Measure the voltage of the battery using a multimeter. A good battery should have a voltage around 3.3.
  4. If the voltage is adequate but the key fob still doesn’t work, proceed to the next steps of troubleshooting.

Step 2: Ensuring Proper Battery Contact

Sometimes, the battery’s positive side may not make proper contact with the key fob’s metal piece, leading to key fob failure. Follow these steps to address this issue:

  1. Check if the two small tabs inside the key fob are folded down. If they are, fold them up, as this can prevent the positive side of the battery from making contact.
  2. After folding up the tabs, insert the battery back into the key fob.
  3. Test the key fob by pressing the buttons and checking if the red light blinks. If it works, the contact issue has been resolved. If not, move on to the next step.

Step 3: Trying a Different Battery

If the previous steps didn’t resolve the key fob issue, it’s time to try a new battery. Not all batteries, even ones with higher voltage, are compatible with Honda key fobs. Follow these steps to find the right battery:

  1. Purchase a new battery, preferably from a reliable brand like Amazon Basics or Energizer.
  2. Install the new battery into the key fob, ensuring the correct polarity.
  3. Test the key fob again by pressing the buttons. If the red light blinks, congratulations! Your key fob is now functioning properly.

The Importance of Voltage Verification

To maintain a functional key fob, it’s always handy to have a multimeter. Before installing a new battery, make sure to verify the voltage. Batteries with a voltage below 2.8 are considered dead and will not work. By following this precautionary step, you can save yourself from the hassle of replacing the battery again.


In conclusion, fixing a Honda key fob doesn’t always require an expensive trip to the dealership. By troubleshooting the battery issue, you can save yourself hundreds of dollars and continue to use your existing key fob. Remember to check the battery, ensure proper contact, and try a different battery from a reliable brand. Additionally, always verify the voltage with a multimeter to ensure optimal performance. We hope this guide has been helpful in resolving your key fob issues. Thank you for reading!