How to Unlock a Car with a Broken Key Fob

Published on Mar 03, 2025

How to Unlock a Car with a Broken Key Fob

We’ve all been there: you’re about to head out, and you can’t find your car key. After searching your pockets or bag, you finally locate your key fob, only to discover that it’s broken. This can be incredibly frustrating, especially if your car is one that relies on the key fob for remote locking and unlocking. The good news is that there are several ways to unlock your car with a broken key fob. Whether it’s a simple battery issue or something more complex, understanding the steps to take can help you get back on the road as quickly as possible.

In this article, I will walk you through the steps to unlock a car with a broken key fob, share personal experiences, and provide tips for when it’s time to seek professional help. I’ve been there myself, and I can tell you that it’s not as complicated as it might first seem. Plus, I’ll offer solutions to prevent the issue from happening again in the future.

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Arrow Auto Glass

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1. Check the Battery of Your Key Fob

The most common reason for a broken key fob is a dead or weak battery. I remember one time when I was trying to unlock my car, and nothing was working. I was in a hurry, and the frustration was starting to build up. But then I realized that the battery in my key fob had simply run out. Replacing the battery in your key fob is often the quickest and easiest solution. Here’s how I did it:

  • Remove the key fob cover carefully to expose the battery. This is usually done by pressing a small latch or using a coin to pry it open.
  • Once the battery is exposed, carefully remove it. Make sure you note the type of battery so you can purchase a replacement (commonly a CR2032 or similar). You can check your car’s owner’s manual if you’re unsure of the battery type.
  • Insert the new battery, ensuring that the positive and negative sides are properly aligned. This step is crucial to ensure the key fob functions correctly.
  • Snap the cover back on and test your key fob to see if it works. If it doesn’t, try re-inserting the battery or use a different one to rule out any defects with the replacement battery.

If you find that replacing the battery doesn’t solve the problem, then the issue might be more complex, which leads us to the next step.

Beckwith's Automotive Services Center
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Beckwith's Automotive Services Center

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2. Manually Unlocking the Car with the Mechanical Key

If the battery replacement didn’t do the trick, it’s time to move on to another option: manually unlocking the car. Many modern cars come with a hidden mechanical key inside the key fob that can be used to unlock the car if the fob itself is not working. Here’s what I did when faced with this situation:

  • Locate the small button or latch on the key fob that releases the mechanical key. Depending on your vehicle, you may need to slide a latch or press a small button on the side of the fob.
  • Once you have the mechanical key, you can use it to unlock the driver’s side door. Many cars have a hidden keyhole that can’t be easily seen, so you might need to look closely or consult your owner’s manual for guidance.
  • Insert the mechanical key into the lock and turn it to open the door. This method works even if the key fob is completely dead or broken, so it’s a good fallback option if all else fails.

3. Use the Smartphone App to Unlock Your Car

Some newer cars come with the ability to unlock the car through a smartphone app. For example, brands like Tesla, GM, and BMW offer apps that allow you to control your car’s locks and other features remotely. This is a convenient solution if your key fob stops working and you’re near your phone. I’ve used this option myself when I was stuck in a parking lot without a working key fob, and it saved the day.

Here’s what you can do:

  • Open the app on your smartphone and log in to your account. Most apps will require a user name and password for security reasons.
  • Navigate to the “Lock/Unlock” feature, usually found in the main menu of the app. You should be able to lock or unlock your car directly from your phone.
  • If your car is not equipped with such an app or if the app is malfunctioning, it’s time to try a different option.

4. Contact a Professional Locksmith or Car Mechanic

If the previous solutions don’t work, then it’s time to seek professional help. Calling a locksmith can save you time and trouble. They are trained to deal with issues like broken key fobs, and they have specialized tools to unlock your car without damaging it. I had to call a locksmith once when I couldn’t get my fob to work, and they arrived within 30 minutes and had my car unlocked in no time.

  • Locksmiths can often fix or replace a broken key fob, and they may be able to help with reprogramming it if needed. They also have the expertise to create a new key if necessary.
  • For more advanced issues, such as a faulty electronic system, a car mechanic might be needed to diagnose and fix the underlying problem.

Regardless of whether you’re using a locksmith or a mechanic, be sure to get a quote and ask about any warranties or guarantees for their services. A good professional will provide transparency about the process and cost.

5. Prevent Future Key Fob Problems

After experiencing key fob issues, I realized that taking a few steps to prevent future problems could save a lot of headaches. Here are a few tips I’ve found helpful:

  • Regularly replace the battery in your key fob. Even if it’s not showing signs of failing, it’s a good idea to replace the battery every year or two to prevent being locked out.
  • Avoid dropping your key fob. Dropping it on hard surfaces can damage the internal components, so I always make sure to handle mine with care.
  • If you’re having issues with your key fob not responding to pressing buttons or not unlocking your car, try cleaning the contacts on the fob’s battery compartment. Dirt or debris can cause intermittent issues.

6. When to Seek Towing Assistance

If your key fob issues are combined with other car troubles, such as engine failure or electrical problems, it might be time to contact a towing service. For example, if you’ve tried everything and your car refuses to start due to a malfunctioning electronic system tied to the fob, you’ll need professional assistance. Fortunately, towing services like Rescue & Towing are always available to help you get your car to a safe location, whether it’s a mechanic or a service center.

In some cases, having your car towed to a repair facility ensures that the problem is dealt with in the right hands, without causing further damage to your car’s system.

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