Honda Key Fob Not Working After Battery Replacement: A Complete Guide

Modern cars and vehicles are equipped with keyless entry systems. This makes entering the vehicle convenient without the hassle of using the car keys. You can open or even start your car with the help of a key fob, which is a small electronic device. The key fob may stop working for whatever reason, even with a fully charged battery. The type of battery you use may be the cause of your key fob not working after a battery replacement.

Honda key fob won’t work after battery replacement:

Most people are familiar with Honda because of its leading SUVs and sedans. All Honda vehicles are equipped with a key fob, but they all come with remote start. It is one of the most dependable products on the market, with a range of 400 feet.

Since the key fob comes with all of these great features, it is extremely frustrating when it stops working. In most instances, the battery is sometimes not at fault. You may find that even after changing the battery, the key fob still does not work. There might be other factors to consider in this case.

Resetting the key fob might be the cause:

To work, an automobile key fob must be linked securely to the car. Key fobs are equipped with transmitters that are connected to receivers in vehicles. It is impossible for others to unlock yours, even if they have the same make and model as yours. You can feel safe and secure in your car due to the additional layer of protection.

The disadvantage of this is that the connections might be reset if your battery is replaced or your key fob is replaced, and your vehicle will then be unable to be identified. If you want the key fob to work with your vehicle again, you will have to reprogram it. In some cases, this will mean you can’t startup the car until the program is updated.

Fob key reprogramming can help fix the problem:

It is possible that your key fob needs to be reprogrammed. It is not uncommon for aftermarket key fobs to have similar problems, although original fobs are not affected. The problem affects the owners of second-hand cars as well. This is a relatively easy way to reprogram a key fob. The process is easy for older models of cars, but it requires special equipment for newer models. As a result, you might need the help of a Honda dealer.

Damaged key fob:

If your key fob does not work, it may be the result of a broken part. You may have accidentally damaged the wiring circuit or the keys if you tried to change the batteries yourself. It is sometimes the unlock button causing problems which means that your key fob has a broken unlock button, and you need to get a new one. When none of the controls work, your key fob may be defective.

The transmitter is damaged:

Signals are sent and received by two components of a key fob, which is based on a basic communications principle. Here, the transmitters are in the remote and receivers are inside the car. In pairing, signals are exchanged between the two devices. Through their interactions, the door is locked and unlocked, the vehicle is started, etc. If either of the components is broken, the communication line will be disrupted, and the key fob will stop operating.

Fixing the transmitter:

Other internal damages can also affect the transmitter, such as loose connections. The key fob might not need to be touched in this case. You may get it fixed by a locksmith or mechanic, or you can pay to have it done at the dealership.

Installed incorrectly:

You should check if the battery has been installed correctly. Furthermore, your owner’s manual will provide more details about battery replacement. Checked the battery’s orientation before installation. Batteries are usually marked on their positive sides, but not on their negative sides. The front of the positive side is generally facing down, but this varies.

Incorrect battery type:

If you are planning to change your battery, be sure to consult your manual. Here you can find information about how to change your battery, as well as which type of battery you should purchase. If you use the wrong voltage, your key fob may become inactive. Never attempt to force a battery into the battery holder. The terminals may be damaged in this manner.

Damaged Contacts:

Since key fobs are almost always used, they are subject to heavy abuse. This can damage circuit boards, break connections, and even damage the buttons. Be sure that the controls and their contacts are working by opening the key fobs carefully. If a connection is lost or disconnected, you may try to solder it. If you’re unfamiliar with boards, don’t even try it! Check to see whether the buttons are working properly. They may become dislodged and must be re-inserted in some situations.

What to Do if Your Car Key Fob Doesn’t Work:

  • Almost every modern car comes with a mechanical key, including Hondas.
  • Using this mechanical key, you can open the driver’s side door.
  • Press the Start button after you open the car and hold the key.
  • The engine will probably start and run. The key fob battery may not be the problem if the engine doesn’t start and you cannot even open the doors.
  • When your Honda Key Fob fails to work after a battery change, don’t assume it’s because the battery is dead.
  • It is most likely that you used the wrong or fake battery.
  • You must make sure the battery is installed correctly to ensure that it works.


Changing the battery in a car is not a difficult task for an average person. Even after a battery replacement, the key fob may still stop working from time to time. Furthermore, if the key fob is an aftermarket model, there are techniques for resetting it. For earlier models, you can reset the Honda key fob yourself, although newer ones may need a specialist.

It is possible that you will need the assistance of a dealer or a locksmith. The key fob can nevertheless be opened for repairs if you are knowledgeable about opening the fob.

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