The Tire Pressure Monitoring System
Have you seen or are you seeing this light on your instrument panel? What the heck does the symbol mean and what the heck do you do about it? It is the TPMS – Tire Pressure Monitoring System – indicator. 
And it is the single most misunderstood warning indicator you will see on your instrument panel. A number of issues with today’s cars and and the people who service them come gift wrapped in this one symbol. The symbol shown to the right is a rarer version and is discussed below.
Is the Car At Fault?
We are accustomed to warning lights pointing to a fault with a system in the car. That is rarely the case here, as the light is primarily shown to inform a driver that the tire pressure or pressures in the tires—including the spare—are low and there is likely no actual fault with the vehicle! So here we will discuss the merits of the TPMS light.
Under the category of misunderstood, this light has been described by drivers variously as:
- An exclamation point in parenthesis
- An exclamation point in brackets
- An exclamation point in a horseshoe
- Flames – destined to be a classic!
- A wishbone
- An exclamation point in a fish bowl
- An exclamation point in a cup
- And, a real favorite, a candle in a glass!
Never has anyone called and said “I have an exclamation point in the cutaway of a tire” – which is exactly what it is!
Everyone from motorists to service personnel, believe it is nothing but a pain in the neck. But, in truth, it is doing its job, calling attention to the fact that the pressure in one or more of your tires is low. Addressing the issue when it comes up will save you money on tires and fuel by extending the life of your tires and by reducing rolling resistance, respectively.
The light suggests four possible scenarios:
Continue Reading …
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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
The Single Most Misunderstood Warning Indicator on Your Instrument Panel – Part II
Misunderstood Warning Indicator: Continued from Part I
This suggests four possible scenarios. The first three assume the light is not flashing:
1) All the tires are low on air (check your spare in the trunk too, if you have one). This occurs seasonally as the weather cools, and possibly several times. Solution? Check the pressures and inflate your tires properly.
2) One tire is low. This likely means a nail or other fault causing the tire to leak slowly. Checking all of the tire pressures will reveal a single tire to be low. A qualified service facility will be needed to address the problem.
3) The system needs to be reset. If you’ve recently had the tires rotated or replaced, check with your dealer about resetting the TPMS system.
4) If the light is flashing, there is a fault in the TPMS system, which your dealer or qualified service shop will have to resolve. Again in the first three cases, the light is simply illuminated, not flashing.
If you must drive before addressing the light, please do so carefully…under inflated tires are a potential hazard. Your tires are the only thing between you and the pavement. The light will go out after the proper tire pressures have been restored and after a bit of driving.
And by the way, the light will also come on if a tire blows, but the blowout will have your full attention…
So please, show this light some respect! Its doing its job, even if you see it illuminated on multiple occasions during year! Your tires need the attention.
Now if every car could tell you which tire and the exact air pressure…
In another article, we discuss how too many of the warning symbols shown on today’s instrument panels assume too much of today’s information-overloaded drivers and do everyone a disservice.
The International Standards Organization (ISO) establishes symbols for use on controls, indicators and telltales applying to passenger cars, light and heavy commercial vehicles and buses, to ensure identification and facilitate use.
It also indicates the colors of possible optical tell-tales, which are supposed to inform the driver of either correct operation or malfunctioning of the related devices. The American National Standards Institute also has a hand in this.
To date, the ISO has defined over 220 of these symbols, and growing! They are supposed to be identified easily by all people everywhere regardless of language and background. But all the good intentions – and not too mention a good deal of time, effort and money – has resulted in far too many symbols that mean absolutely nothing to the average driver.
Check out the videos below.
And one filling the tires.
… Back to Part I
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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