What Does the Frost Warning Light Mean?

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Auto makers know that driving in the winter can be dangerous. Fog and rain can reduce your visibility, but even worse, the ice can make roads so slippery that they are almost undriveable at normal speeds. To help keep drivers safe and more aware of their surroundings, car manufacturers have started including a frost warning light on the dashboard. This warning light is controlled by a temperature sensor located around the front bumper, away from the heat of the engine. When the outside air passing over the sensor reaches a certain temperature, the computer turns on the warning indicator on the dashboard and warns the driver of potential frost on the road.

What the frost warning light means

There are 2 stages to this light being illuminated depending on the temperature outside. The light first turns on when the outside air starts to reach freezing temperatures, around 25° F. Even though water usually starts freezing at around 22° F, this warning light will turn on before that point to warn the driver that ice may start forming. In this stage, the light will be amber in color. As temperatures get lower and lower, the light will turn to red to indicate that the outside temperatures are below freezing and that ice is a real possibility.

Is it safe to drive with the frost warning light on?

As long as you pay attention to the light and use caution while driving, you can continue on your journey. This warning should not be ignored as ice poses a real threat to your safety on the road. It’s also very important that you have the correct type of tires for your environment. All season tires work pretty well in the winter, but if you live in an area with heavy snow fall, it might be worth it to invest in a set of snow tires.

If you think there is an issue with your frost warning system, get one of our certified technicians to help you investigate and determine the cause.


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Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Chevrolet Impala - Warning Light is on - Norfolk, Virginia
First off he was on time....actually 30 mins early which was great. Everything he described was what I was going through and he knew exactly what I needed before he even looked at the car. Other mechanics i feel were trying to take advantage because I am a woman but he made me feel comfortable. Still have to get work done on it but at least I know exactly what the problem was.
Chevrolet Tahoe - Warning Light is on - Norfolk, Virginia
Very detailed and takes the time to explain what is being done. Willing to answer any questions you may have. I would definitely use his services again and have already been telling my coworkers about this site. I have a unique electrical situation going on with my truck that none of the dealers could assess. Just by Matt doing some general maintenance , my truck is already driving smoother. Matt asked that I monitor things to make sure we don't need to troubleshoot anything else. I feel quite confident.

Robert

11 years of experience
2 reviews
Robert
11 years of experience
Buick Encore - Warning Light is on Inspection - Manteca, California
He was great because I didn’t have to go anywhere I just stayed at home and he took care of everything

Travis

11 years of experience
309 reviews
Travis
11 years of experience
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

Andrew

23 years of experience
148 reviews
Andrew
23 years of experience
Audi A3 - Warning Light is on - Riverdale, Georgia
Great mechanic! Not only was Andrew on time, but he was professional, knowledgeable and very informative. Highly recommend.

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