Is it Safe to Drive with Low Tire Pressure?
Have you ever been driving and noticed that yellow horseshoe with an exclamation point lit up on your car’s dashboard? This symbol is your Tire Pressure Monitoring System (TPMS) alerting you to potentially under-inflated tires.
A national study conducted by Schrader International found that only “58 percent of drivers could properly identify the lifesaving TPMS warning symbol.” This is concerning because roughly 11,000 tire-related crashes occur annually. Understanding this symbol and how to handle low tire pressure is crucial for your safety on the road.
What Happens If You Drive on Low Tire Pressure?
Driving with low tire pressure can have a number of negative consequences, impacting safety as well as vehicle performance and fuel efficiency. Here’s what happens when you drive on under-inflated tires:
- Increased Risk of Blowouts: This is the most serious concern. Under-inflated tires generate excessive heat due to increased flexing in the sidewalls. This heat buildup can lead to a sudden tire blowout, potentially causing you to lose control of your vehicle at high speeds.
- Reduced Handling and Braking Performance: Low tire pressure alters the tire’s contact patch with the road, reducing grip and traction. This makes steering and braking sluggish, especially in critical situations like emergency maneuvers. Stopping distances are also negatively affected.
- Uneven Tire Wear: When a tire is under-inflated, it bulges more than intended. This puts extra stress on the outer and inner shoulders of the tread, leading to uneven wear and a shorter lifespan for your tires.
- Decreased Fuel Economy: Low tire pressure creates more rolling resistance, forcing your engine to work harder to maintain speed. This translates to lower fuel efficiency and higher gas costs.
What to Do When Your Low Tire Pressure Light Comes On
Don’t ignore the low tire pressure light. When you can safely check the air pressure in all of your tires, do so. Even if you are in a newer vehicle that indicates which tire is low, it pays to check all of the tires and adjust air pressure accordingly. Weather can also play a role in tire pressure. Colder weather can cause tire pressure to slightly drop, so continue to periodically check tire pressure levels in all of your tires when completing your maintenance checklist.
If tire pressure continues to drop even after filling your tire with air, you could have a hole causing air to escape. Make an appointment with an auto repair shop to have your tires evaluated. Best case scenario is your tire can be patched to fill the hole or you may need new tires.
If a low tire turns into a flat and you switch to your spare, check how long you can drive on a spare tire before you head out.
Don’t Rely Solely on Tire Pressure Monitoring Systems
Systems that monitor tire pressure are in vehicles to warn operators of air leaks, but you shouldn’t rely heavily on them. As a responsible driver you should be inspecting your vehicle periodically for maintenance issues. Doing your own inspections allows you to catch and correct issues before they become big safety hazards. Ensure your vehicle is receiving the necessary maintenance. When you have your oil changed at a garage they should also check your tires for wear and provide balancing. Don’t be afraid to ask questions when it comes to the work being done on your vehicle.
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Frequently asked questions
What does the yellow horseshoe symbol on my dashboard mean?
That yellow horseshoe with an exclamation point inside is your Tire Pressure Monitoring System (TPMS) warning light, and it means at least one of your tires is under-inflated. A national study by Schrader International found that only 58 percent of drivers can correctly identify this symbol, which is concerning given that roughly 11,000 tire-related crashes happen every year. When the light comes on, take it seriously and check all four tires as soon as you can do so safely.
Is it safe to keep driving with low tire pressure?
No, and the risks go beyond a flat tire. Under-inflated tires flex more in the sidewalls, which builds excess heat and can trigger a sudden blowout at highway speed, potentially making you lose control of the vehicle. You also lose grip and traction because the tire's contact patch with the road changes, which means sluggish steering and longer stopping distances. On top of that, low pressure causes uneven tread wear that shortens the tire's life, and increased rolling resistance that burns more fuel.
Does cold weather actually drop my tire pressure?
Yes. Cold temperatures cause the air in your tires to contract, which slightly reduces pressure even if your tires are otherwise healthy. That's why a TPMS warning often appears on the first cold morning of the season. Check all four tires periodically through the winter as part of your maintenance routine and top them off to the pressure recommended in your owner's manual or door-jamb sticker. Don't trust the maximum pressure printed on the tire sidewall, that's the limit, not the target.
What should I do if my tire keeps losing air after I refill it?
If you fill the tire and the pressure keeps dropping, there's likely a hole, nail, or valve stem issue letting air escape. Make an appointment with an auto repair shop to have the tire evaluated. In the best case the technician can plug or patch the tire, but if the damage is in the sidewall or the tread is worn, you'll need a replacement. Don't keep driving on a leaking tire, the repeated under-inflation makes a blowout much more likely.
Should I rely on my TPMS to catch tire problems?
No. TPMS is there to warn you about air leaks once they reach a certain threshold, but it's a backup, not a substitute for inspection. A responsible driver looks at their tires regularly as part of routine vehicle maintenance, checking for visible wear, cracks, embedded objects, and uneven tread. When you get your oil changed, ask the technician to inspect the tires for wear and to balance them if needed. Catching issues yourself before they trigger a warning light is how you stay ahead of safety problems.
