Why is my tire pressure warning light on?

By Product Expert | Posted in Service, Technology, Tips/Tricks on Thursday, January 16th, 2020 at 4:27 pm
person putting air into tire up close

Top reasons your Mercedes-Benz tire pressure warning light is illuminated 

Mercedes-Benz vehicles, like the commercial vans we sell here at Mercedes-Benz Arrowhead Sprinter, often come with a TPMS (Tire Pressure Monitor System). That TPMS will be able to monitor your tire pressure every day and will illuminate a warning light if the tire pressure is not at, or close to, the recommended psi. Below, we will go over the common reasons that your tire pressure warning light may be on and what you can do about it. 


Tire pressure can drop over time 

Your vehicle’s tires are always under a lot of pressure, pun intended. They hold up the weight of your vehicle. So, it isn’t surprising that some air can escape from your tires on a regular basis. There shouldn’t be too much air leaking from your tires. If there is, you may have a loose cap or another puncture. However, it is completely normal for tires to leak air at a rate of one or two psi per month. That means that you should be checking your tires’ pressure every few months to make sure that it hasn’t slipped too far below the recommendations. There isn’t anything you can do about a slow, natural leak except for staying on top of checking and refilling your tires before the warning light comes on. 

man changing vehicle tire

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Temperature can affect your tire pressure 

Tire pressure can change with temperature, and your tires can warm up after being driven on for a while. The heat is a result of the friction and tire movement. Changing a tire’s temperature can result in a change of psi, which can then trigger your TPMS warning light to illuminate. The best thing to do is to check your tires’ pressure before you have driven very far. This way you can get an accurate measurement and can know that your psi is fine. 


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