How to Reset Key Fob After Changing Battery

Your car key fob is designed to last you anywhere between 6 and 7 years without issues. But, as it is common with most cars, the key fob battery dies after some time. This can stop it from functioning as required. Most people solve this by simply changing the key fob battery. But, this may not be enough. Your fob may still not work after that. It then becomes important to learn how to reset key fob after changing battery.

Why does my key fob not work after replacing car battery?

Resetting or reprogramming your key fob allows the car’s receiver to recognize any new codes that may have been generated by the fob. After a battery change, the fob may start to throw new codes that are not familiar to the car’s frequency transmitter. As such, you’ll need to reset or reprogram it. Below is all the information you need to know to do this successfully.

How do I reset my key fob after replacing the battery?

Cars have different procedures to reprogram their key fobs. In this guide, I’ll provide several methods that you can use. The first three solutions work for most vehicles sold on the market today. This includes some Nissan and Infiniti models. As for the rest, they are specific to cars made by other manufacturers. Let’s dive in.

Solution 1 – How to reset key fob after changing the battery

  1. Get into your car with your key fob and close the door.
  2. Insert the key into the ignition and turn it to the “ON” position. (Do not start the engine).
  3. Press the “Lock” button on your key fob for one second while it’s still in the ignition cylinder.
  4. Turn the key to the “OFF” position.
  5. Repeat this process at least three times. The car’s receiver will save the data from the signal sent by the key. You should hear a lock sound when this happens. The sound means you’ve gotten into the programming mode.
  6. Press the “Lock” button within five seconds. This will commence the programming process.
  7. If you have spare key fobs, press the “Lock” button on them as well within 10 seconds to reprogram them.
  8. Turn your key to the “OFF” position to complete the programming procedure.
  9. Step out of the vehicle and test the lock, unlock, and other buttons on your key fob.

Related: How to Reset Car Alarm After a Battery Change

Solution 2 – How to reset key fob after replacing the battery

  1. Get into your car and close the door. Have your key fob with you.
  2. Insert the key into the ignition.
  3. Turn it to the “ON” position, then to the “OFF” position.
  4. Repeat this several times in a row until you hear a chime. The chime means that the car is in the reprogramming mode now.
  5. Press the “Lock” or “Unlock” button on your remote. You should hear a second chime.
  6. Turn the key to the “OFF” positon, remove it from the ignition, and get out of the car.
  7. Test your key fob to see if it works.
How to Reset Key Fob After Changing Battery

Solution 3 – How to reset key fob after changing the battery

  1. Get into your car. Lock your door manually.
  2. Insert the key into the ignition and remove it.
  3. Repeat this about six times in a span of 10 seconds.
  4. If this works for your vehicle, the interior and exterior lights will flash.
  5. Insert the key into the ignition once again and turn it to the “ON” or accessory position.
  6. Push the “Lock” or “Unlock” button on your remote.
  7. If the reprogramming worked, the hazard lights will turn on.
  8. You can now get out of the vehicle and test your key fob.

Read more: How to Bypass Car Alarm to Start a Car

Solution 4 – How to reprogram a key fob for Chrysler

  1. Press the “Lock” button on your key fob 5 consecutive times, with an interval of 2 seconds between each press.
  2. Get into your car and put the key into the ignition.
  3. Turn the key to the “RUN” position.
  4. Press and hold the “Unlock” and “Panic” buttons simultaneously.
  5. Release both buttons at the same time. You will hear a small beep to indicate that programming has started.
  6. Press the “Lock” and “Unlock” buttons and release them at the same time.
  7. Turn your key to the “OFF” position and remove it.
  8. Test to see if the key fob works.
How to program key fob

Solution 5 – How to program key fob for Jeep

  1. Get into your car and confirm that your doors and trunk are closed.
  2. Put the key into the ignition. Keep it in the “OFF” position.
  3. Open your driver’s door and leave it open.
  4. Move the door switch to the “Lock” positon and leave it there while the door is still ajar.
  5. Turn the key to the “ON” position.
  6. Press and hold the “Lock” button on your key fob for 5 seconds.
  7. Release the “Lock” button on the key fob and remove the key from the ignition.
  8. Test your key fob to see if it works.

Read more: How to Remove a Broken Key From Ignition

Solution 6 – How to program car key fob for RAM

  1. Get inside your RAM and put the key in the ignition.
  2. Turn the key to the “Run” position and wait until the chime stops.
  3. Press and hold the “Unlock” button on your key fob for about 10 seconds.
  4. Release the “Unlock” button and press and release the “Panic” button.
  5. Sync your other key fobs to your RAM by pressing any of their buttons.
  6. Turn the car off, step out, and test your keys.
How to Reset Key Fob After Changing Battery

Solution 7 – How to reset Key fob after changing battery for Dodge

  1. Get into your car and unlock the door using your key fob. Do this within the first 10 seconds of getting in.
  2. Put the key into the ignition and turn it to the “RUN” position while pressing the “Unlock” button.
  3. Hold the “Panic” and “Unlock” buttons simultaneously, then release at the same time.
  4. Press the “Lock” and “Unlock” buttons together and release.
  5. Press the “Unlock” button one last time.
  6. Test your key fob to see if it now works.

Read more: How to Fix a Broken Car Key That Has Snapped

Solution 8 – How to reset key fob after changing battery for Ford

  1. Get into your car and put the key into the ignition.
  2. Turn the key from the “OFF” position to the “RUN” positon 4 times in a span of 6 seconds.
  3. The system will chime to show it has entered programming mode.
  4. Press any button on the key fob within the first 20 seconds. This will initiate the programming process.
  5. Press any button on any other spare key fobs to also program them.
  6. Turn the ignition to the “RUN” position to end programming mode.

Solution 9 – How to reset key fob after changing battery for Oldsmobile

  1. Get inside your car and close all the doors.
  2. Put the driver side door lock switch in the “Unlock” position and hold it.
  3. Insert your key into the ignition and then remove it. Do this three times.
  4. Release the door lock switch. You should hear three beeps that indicate the vehicle has entered into programming mode.
  5. Press the “Lock” and “Unlock” buttons at the same time on your key fob and hold them until you hear two beeps. This shows that the transmitter has been programmed.
  6. Repeat step 5 above to program any other key fobs that you may have.
  7. Remove your key from the ignition to end programming mode.
  8. Get out of the car and test your keys to see if they work.

What to do if your key fob is not working after battery change

  1. Use a backup remote if you have one to verify that the key fob is indeed bad.
  2. Check to see that the battery isn’t installed upside down.
  3. Open the key fob and check for misaligned buttons or broken contacts. Carefully solder them back in place.
  4. Reprogram your key if you find and fix any internal issues.
  5. Visit a professional and have them reprogram the key fob for you.
  6. Replace your key fob with a new one.

Special key fob reprogramming

For some vehicles such as newer versions of Volkswagen, Audi, and BMW, it is not possible to reset the key fob yourself. You’d need to take it to a specialist hardware programmer. These key fobs are made to provide maximum security for owners and are designed to meet very high engineering standards.

Despite the fact that professional services could be expensive, it is relatively better, safer, and more effective than you trying to go around the engineering of the key fob. You may end up damaging your ECU which can put you a couple of more dollars behind. But if you first need to confirm if your car’s key fob is self-programmable, you can start here on how to program VW key transponder.

How to program key fob push start (Keyless ignition systems)

Vehicles with keyless ignition systems are also known as keyless start, smart key, intelligent key, or keyless push-button start. They allow you to start the engine without inserting a key into an ignition cylinder. Some cars have push-start buttons that only work when the key fob is nearby.

They still typically have a physical key fob for locking and unlocking the door. The fob will also have a key hidden inside of it. Another thing that may be hidden is the keyhole on your doors. Some cars have it behind a trim piece that you’d have to pry away to get to the keyhole. Just be careful not to bend the pieces or damage the paint.

If your vehicle has a keyless ignition system, you may be wondering how do I reset my key fob after replacing the battery or how to program key fob push start. Here, there’s always the possibility that the car’s receiver is damaged. You can inspect the wireless door lock receiver from the dashboard. Don’t plug or connect anything to it. The culprit could also be your keyless entry remote.

To reprogram a key fob for a push-start car, the process is similar to the generic method for most cars. You just need to know how and when to press the ignition as well as the key, and in what sequence. To program a totally new key in some newer models, you need a special diagnostic tool that can handle the immobilizer.

FAQ

Can you program a new key fob yourself?

Yes, you can program a new key fob yourself. This is especially if it doesn’t require any special programming from a local dealer or the car manufacturer. You’ll need to follow a specific process to successfully reset your key fob.

How much does it cost to reprogram a key fob?

It costs nothing to reprogram a key fob for most car models if you do it yourself. If you need to reset and program the immobilizer function like in some German models, it may cost you anywhere between $200 and $500 to have it done by a professional.

How to erase key fob memory?

Erasing your key fob memory will need a suitable OBD-II diagnostic tool. This particular tool costs more than a generic scanner as it comes with the ability to read and erase codes. Check to see if there’s one that’s compatible with your car model before buying.

How do I know if my key fob is bad?

One of the signs of a key fob that’s failing or going bad is a weak signal that allows you to open your doors and trunk only when you’re in very close range to the car. Having to press the buttons severally to get the key to work is also a common sign. You can start by first replacing the key fob battery. If that doesn’t work, you may need to replace the key fob entirely.

How do I know what key fob to get?

Most car key fobs have numbers at the back that indicate the model of the key. When buying a new key fob, make sure these numbers match. This is the surest way to ensure that the key you get will actually work with your car. You can consult your user manual if your key fob does not have the model number indicated at the back of it.

Do you need to reprogram key fob after changing battery?

For most cars, you do not need to reprogram key fob after changing battery. However, if you replace your key fob battery and realize that it’s not working, you’ll need to reset or reprogram it to get it to work.