What Does the Key Fob Battery Low Warning Light Mean?

Key fobs have made life much easier for drivers. Short for “finger operated button”, key fobs allow us to unlock all of the doors at once without having to fiddle with the keys.

Some cars are so sophisticated that they can be unlocked just by carrying the key fob with you as you approach the car. Unfortunately, the fobs use batteries which eventually run out of power. If your key fob battery went completely dead, you wouldn’t be able to start the car and could end up stranded somewhere. To prevent this from happening, there is a warning light on the dashboard that indicates when the battery should be replaced in the fob.

What the key fob battery low warning light means

When the key is in use, the computer monitors the output voltage of the fob’s battery. Once the voltage gets to a certain point, the warning light will illuminate on the dash to let you know to replace the batteries.

Most fobs can be pried open to access the battery so you may not have to take your car anywhere. Your owner’s manual may have information on what type of battery should be used and how to replace it. Otherwise you can find this information online. Make sure that you use the correct type of battery. A different battery will have a different voltage and the system may not register properly, even if the fob still works.

If you have multiple key fobs, it's a good idea to replace all of the batteries at the same time as they tend to run out at the same time. Keep in mind, some vehicles may require a reset procedure before the low battery key fob light will turn off.

Is it safe to drive with the key fob battery low warning light on?

This light doesn’t affect driveability so it is okay to use the car normally if the light is illuminated. If you let the battery get too low on voltage, you may not be able to start the car. Don’t ignore the light and change the batteries out to prevent this from happening to you. If your key fob doesn’t appear to be working normally, our certified technicians can help you diagnose any issues.


Next Step

Schedule Warning Light is on Inspection

The most popular service booked by readers of this article is Warning Light is on Inspection. Once the problem has been diagnosed, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. We currently cover over 2,000 cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Recent Warning Light is on Inspection reviews

Excellent Rating

(238)

Rating Summary
224
5
4
0
5
224
5
4
0
5

Jason

15 years of experience
344 reviews
Jason
15 years of experience
Nissan Armada V8-5.6L - Warning Light is on - Mineola, New York
Excelente. Jason es todo un profesional con mucho conocimiento en la mecanica, buena persona educado y amigable. Gracias Jason.
Ford Taurus - Warning Light is on - Jamaica, New York
Very Professional definitely takes his time to find out exactly what’s the problem with the car! I was up and running in no time ! Will definitely recommend Him to anyone having issues with cars!!!

Nicholas

11 years of experience
585 reviews
Nicholas
11 years of experience
Chrysler 300 V6-2.7L - Warning Light is on - Durham, North Carolina
Excellent diagnostician. Knowledgeable and caring. Created a desire for him specifically, to do the job. Hope we get him every time!
Honda Accord - Warning Light is on - Garner, North Carolina
I was very happy with Nicholas and his knowledge and expertise about diagnosing the issues with my car. He is honest, reliable and professional. He is now my Mechanic that I will call on for all my car's needs.I will also recommend him to my friends whom have been taken advantage of by other car shops as I have been, and are looking for someone honest , that will not take advantage of them Thank you so much Nicholas for resolving my issue with my car. I feel relieved and happy with the outcome

Tony

40 years of experience
12 reviews
Tony
40 years of experience
Cadillac Escalade EXT V8-6.2L - Warning Light is on - Stockton, California
Good,mechanic helpful ,smooth move but quick, friendly patience and deep experience as a mechanic,as a customer I recommend Tony Crockett if you need a mechanic.

Brent

8 years of experience
56 reviews
Brent
8 years of experience
Jeep Grand Cherokee V6-3.7L - Warning Light is on - Lithonia, Georgia
On time for appointment. Knowledgeable, he explained what he was doing & then explained his findings to me. Later he sent a text with the diagnostic findings,

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Related articles

What Does the Bulb Failure (Exterior Light Fault, License Plate Bulb, Brake Light Bulb) Warning Light Mean?
The bulb failure light turns on when any exterior light on your car isn't working. It's important to fix this so others can see your car's position.
What Does the Fuel Cap Warning Light Mean?
The fuel cap light tells you when a leak has been detected in your car, most likely from a loose gas cap.
What Does the Winter Mode Indicator Light Mean?
The winter mode indicator lets you now when you're driving on winter mode. If it's flashing, an error with the system has been detected.

Related questions

Should the lights on the Rev counter be red when car is running?
The engine is designed to not go over a certain amount of RPM or engine damage can result. If you look in any vehicle that has an RPM gauge, it will have what is called a red line that the...
The ABS, Trac Off and Airbag light came on after a battery change. No lights before with engine running
You may have damaged the systems when you disconnected and connected the positive cable to the fuse block last and not using the battery ground. I would recommend disconnecting just the battery ground and then leave it off for ten...
I have a mercedes vito cdi 113 that has several warnings that have appeared. Brake force distribution, ABS, ESP, Cruise control
If you are using a generic OBD scan tool, you do not have access to all the lines of code. You need to use a more specific tool with the appropriate software Like the Mercedes SDS or one of the...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com