Troubleshoot: Key Fob Not Working with Dead Car Battery – Jumpstart Instructions

Ever found yourself stranded in a parking lot, frantically pressing your key fob, only to realize your car won’t start due to a dead battery? It’s a frustrating situation that can happen to the best of us. But fear not, because help is at hand! In this article, you’ll discover simple yet effective solutions to tackle the issue of a key fob not working with a dead car battery.

Imagine being able to troubleshoot and resolve this common problem in minutes, without the need for a costly trip to the mechanic. By the end of this read, you’ll be equipped with the knowledge and techniques to get your car up and running again swiftly. Say goodbye to the stress and inconvenience of a non-responsive key fob, and say hello to a hassle-free solution that puts you back in the driver’s seat.

Check Key Fob Battery

When your key fob is not working, the first step is to check the battery. Here’s what you can do:

  • Locate the Battery: Most key fobs have a small slot where you can find the battery.
  • Replace the Battery: Purchase a new battery and swap it out following the instructions in your user manual.
  • Test the Key Fob: After replacing the battery, test the key fob to see if it’s working now.

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Remember, a simple battery change can often solve the issue of a non-responsive key fob.

Replace Key Fob Battery

If your key fob is unresponsive, a likely culprit could be the dead battery within it. Follow these steps to replace the key fob battery efficiently:

  • Locate the battery compartment: Check your key fob for a small slot often at its back or side. You might need a small screwdriver to open it.
  • Remove the old battery: Take out the old battery carefully, ensuring not to damage the surrounding components.
  • Select the correct replacement battery: Refer to your key fob’s manual for the specific battery type required.
  • Insert the new battery: Place the new battery in the same position as the old one, paying attention to the correct polarity (+ and – signs).
  • Test the key fob: After replacing the battery, check if the key fob functions properly by pressing the buttons and ensuring it locks and unlocks the car.
  • Reassemble the key fob: Once verified, put the cover back on and securely fasten it in place.

By following these straightforward steps, you can easily replace your key fob battery and address the issue of an unresponsive key fob due to a dead battery.

Resynchronize Key Fob

To resynchronize your key fob with your car after replacing the battery, you can follow these simple steps:

  • Step 1: Get inside your car and close all the doors.
  • Step 2: Insert your key into the ignition and turn it to the “On” or “Run” position, but do not start the car.
  • Step 3: Locate the “Lock” and “Unlock” buttons on your key fob. On some models, they might be on the side of the key. Press and hold both buttons simultaneously for a few seconds.
  • Step 4: Release the buttons and turn the ignition key to the “Off” position.
  • Step 5: Test your key fob by pressing the buttons to lock and unlock your car.

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By resynchronizing your key fob using these steps, you can ensure it communicates correctly with your car, allowing you to conveniently lock and unlock your vehicle.

Jumpstart Car Battery

  • If your car battery is dead and your key fob isn’t working, you may need to jumpstart your car to get it running again.
  • Here’s a simple guide to jumpstart your car:
  • Step 1: Position another running vehicle close to yours.
  • Step 2: Attach the red clamp to the positive terminal of your dead battery, then attach the other red clamp to the positive terminal of the working battery.
  • Step 3: Connect the black clamp to the negative terminal of the working battery, and the final black clamp to an unpainted metal surface on your car.
  • Step 4: Start the working car and let it run for a few minutes.
  • Step 5: Try starting your car. If it works, let it run for a while to charge the battery.
  • Remember: Jumpstarting a car can be dangerous if not done properly. If you’re unsure, it’s best to call a professional for assistance.


Remember, when faced with a dead car battery and a non-working key fob, jumpstarting your vehicle can be a simple solution. By following the steps outlined in this article, you can safely get your car back on the road in no time. Just be sure to exercise caution throughout the process and don’t hesitate to reach out for professional help if needed. With these tips, you’ll be equipped to handle this common car issue with confidence.

Frequently Asked Questions

How do I jumpstart a car battery?

To jumpstart a car battery, position a running vehicle close by, attach jumper cables to the battery terminals matching colors (red to positive, black to negative), start the working car, and then try starting the dead car. Ensure to follow safety precautions and check user manual for specific instructions.

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What should I do if my key fob is not working?

If your key fob is not working, try replacing the battery first. If that doesn’t work, check for any physical damage or corrosion on the key fob. You can also try reprogramming the key fob according to the car’s manual. If the issue persists, it’s advisable to contact a professional locksmith or the car dealership for 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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