Its cold weather time again and time again to speak about the Tire Pressure Monitoring System (TPMS), and its associated warning light(s). Every year several million more drivers who have recently upgraded their cars will encounter the light for the first time.
First, unlike other yellow/amber lights, there is nothing wrong with your car — it presents you information about your tires and likely as not there’s nothing actually wrong with them either.
There are two possible reasons why you are seeing this light. First, as the weather cools the most likely possibility is that all four of your tires are low on air (and/or the spare!). The second possibility is that one tire has a leak of some sort, but we’ll return to that in a moment.
Air expands when heated and contracts when cooled. Air that has cooled and contracted in your tires leads to reduced tire pressure. The warning light comes on and air needs to be added to your tires. Its important to note that air has not actually leaked out.
And while on the subject, a thought for manufacturers. Every vehicle equipped with the tire pressure warning light simply must be equipped with this display. Leaving your customers in the dark by displaying the warning light only is unacceptable to us.
Now, if one tire is several pounds lower than the others, 5, 6 or 7 pounds or more, that tire is leaking and needs to be serviced as soon as possible.
If your vehicle is one that features only the warning light, the tire pressures need to be checked by hand to determine the cause — a single leak or seasonal reduction in all four.
If you’re not comfortable checking your tire pressures or with filling them, the good news is that pretty much every tire store, repair shop or car dealer will fill them for you at no cost. Its simple for them to do and they make a friend in the process, meaning more business from you down the road. Please drop in on one of them.
Each tire valve has a cap that needs to be unscrewed and removed. Don’t lose it — it keeps water and dirt out and will keep the valve from developing a leak.
Learn more about this warning symbol here.
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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.
These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.
Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY
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