How To Reprogram Key Fobs Yourself in 5 Easy Steps
By: Leon Rhodes
A vehicle key fob is a wireless remote entry device capable of locking and unlocking car and truck doors from a distance. Some key fobs have added functionality that can also activate the vehicle's alarm system, open the trunk and start the vehicle.
Reprogramming a key fob to work with your vehicle is easy, if you know the proper sequence. I'll describe how you can reprogram a keyfob yourself in 5 easy steps below. I'll also share a couple of simple key fob remote entry troubleshooting tips at the bottom of the page. Let's get started.
- Step #1 Insert your key into the ignition leaving it in the off position.
- Step #2 Press and hold the unlock button of your vehicle's door.
- Step #3 To enter programming mode quickly cycle the vehicle's ignition from off to on twice(don't start the engine). If successful you will hear the vehicle doors lock.
- Step #4 Let go of the door lock and press/hold the lock AND unlock buttons on the key fob for 20 seconds. The doors will unlock when reprogramming is complete.
- Step #5 Repeat step #4 for any additional key fobs and, when complete, turn the key to the off position to exit programming mode.
FAQ: Common key fob troubleshooting questions
Why is my car not detecting my key fob?
There are several possible reasons a key fob may not sync with your vehicle including a weak FOB battery, a damaged FOB or incompatible make and model of car or truck. While most vehicles that do not have remote entry keys will work with remote entry key FOBs, some will not.
If you are not sure about fob and vehicle compatibility contact your local new car dealership to confirm a key fob will work with your year and model of vehicle.
Why does my key fob forget its programming?
A weak key FOB battery is the most likely cause. To troubleshoot this problem replace the relatively inexpensive FOB battery and inspect for damage. If it continues to "forget" the codes the problem may be with the vehicle.
Check for a weak or missing antenna, a discharged battery and try the FOB from close vehicle proximity to rule out signal interference. Key FOB codes are built in at the factory, it's actually your vehicle that is recording the codes from the FOB.
I hope this guide helped answer your key FOB questions and saved you some money. If you need additional help please send me your questions.