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

(192)

Rating Summary
180
5
4
0
3
180
5
4
0
3

Jason

15 years of experience
344 reviews
Jason
15 years of experience
Nissan Armada - 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!!!

Travis

13 years of experience
477 reviews
Travis
13 years of experience
Volkswagen Beetle - Warning Light is on - Stillwater, Minnesota
Unbenoest to me when you change a battery on a 18 yr. old car you also need more than a code reader to reset the new battery.
Audi A8 Quattro - Warning Light is on Inspection - Minneapolis, Minnesota
Very helpful and very knowledgeable will be using this service again thank you Travis for everything trumbs up

Nicholas

11 years of experience
444 reviews
Nicholas
11 years of experience
Chrysler 300 - 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

Adam

17 years of experience
88 reviews
Adam
17 years of experience
Volkswagen Passat - Warning Light is on - West Palm Beach, Florida
Adam is very knowledgeable and enthusiastic. He diagnosed the problem quickly and accurately and completed the service while I relaxed inside my home. This is the 2nd time I've used YourMechanic (once for my daughter's car away at school) and I could not be any happier.

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

The 10 Transmission Problems to Never Ignore
There’s nothing quite like transmission problems to stress out the average car owner. They are, at best, inconvenient and, at worst, very expensive. Proper...
What Does the Tire Pressure Warning Light Mean?
The tire pressure light warns you when one or more of your tires is low on pressure and needs to be set to the correct PSI.
How to Diagnose a Stalling Car
It’s It’s incredibly frustrating to have a car that stalls and it always seems to happen at the worst possible time – like when you’re in middle of a busy intersection with fifty enraged drivers behind you. There are a...

Related questions

The VSA light came on on my Honda Accord

There is a "connection." When you drained the battery, the PCM and possibly the electronically controlled VSA components themselves "saw" an out of range low voltage, even if momentarily. Such will cause a trouble code to set and illuminate the...

Remote car starter and automatic door locking mechanism won't work after crash.

Hi there. With having the battery cable loose, that caused the computer to reset and lose its memory. I recommend reprogramming the key fob to the vehicle to allow the door locks and ignition to work. First put the key...

What does the no key warning mean?

The no key warning will show up in your vehicle information display for a couple of different reasons. These are as follows: If the Intelligent Key™ is not recognized when you push the start button. This...

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