Why is my tire pressure light on but my tires are fine?

The tire pressure warning light can stay on even when tires look fine because the TPMS monitors pressure in each tire and the health of its sensors. It can trigger from small pressure changes, temperature shifts, or sensor faults that aren’t obvious by sight.

What the light is really telling you

When the TPMS indicator lights up, it signals more than just a visibly low tire. It means the system has detected either a real underinflation somewhere or a fault within the monitoring hardware or software. The most common causes include the following:

• Small leaks that don’t show as a visibly flat tire (from valve stems, bead leaks, or punctures discovered only by air loss).


• Pressure changes caused by weather or driving conditions (cold weather lowers pressure; hot weather raises it).


• Direct TPMS sensor battery failure or sensor damage (each wheel sensor has a small battery that can fail over time).


• TPMS sensor signal loss or a fault in the control module or wiring (a software or communication issue).


• Need for a relearn or reset after tire changes, rotations, or repairs (the system must re-sync with the current wheel sensors).

In short, the light doesn’t always mean a obvious leak or a visibly flat tire; it can indicate unseen leaks, weather-related changes, or a sensor or system fault that requires attention.

How TPMS works and why failures happen

Direct vs indirect TPMS

Direct TPMS uses sensors mounted in each wheel to continuously measure and transmit tire pressure to the vehicle’s computer. Indirect TPMS uses ABS wheel-speed data to infer pressure changes. Most newer cars use direct TPMS, while some older or simpler models rely on the indirect method.

What can fail in a direct TPMS system

In a direct TPMS, wheel sensors are battery-powered and communicate with the central module. Common failure modes include a dead battery in one or more sensors, damaged sensors from road hazards, or loose/corroded electrical connections. When a sensor fails, the light can come on even if pressures are correct.

Weather and time can affect readings

Temperature fluctuations affect tire pressure: a drop in ambient temperature can reduce pressure enough to trigger the warning if you’re already near the threshold. Conversely, very hot days can alter readings and the relearn process. Always read pressures when tires are cold for accuracy.

How to troubleshoot the issue yourself

Before you head to a shop, follow these practical steps to determine whether you’re dealing with real underinflation or a TPMS fault. The list below outlines a logical workflow you can perform at home.

• Check all tires with a reliable gauge when they are cold. Compare readings to the vehicle manufacturer’s recommended cold tire pressure, found on the door jamb sticker or in the owner’s manual.


• Inflate any tire below the recommended pressure to the specified cold level. Recheck all tires after inflation to confirm uniform pressure.


• Inspect for obvious causes of slow leaks, such as nails, screws, punctures, damaged valve stems, or bead leaks. Look for hissing sounds or visible damage.


• If all tires are at spec, perform the TPMS relearn/reset procedure described in your owner’s manual or by using a diagnostic tool at a shop. Drive the vehicle for a short distance to allow the system to relearn if required.


• Note if one tire consistently drops in pressure after a few days, which could indicate a slow leak or a faulty sensor in that wheel.

After completing these steps, if the light remains on despite proper inflation, you likely have a TPMS fault that requires professional service.

When to seek professional help

If you cannot fix the issue with simple inflation and a relearn, or if the light stays on after rechecking, schedule service. A technician can read TPMS fault codes, test each wheel sensor, inspect stems and seals, and replace a faulty sensor or perform a software reset. Regular maintenance helps ensure the system stays accurate and avoids nuisance alerts.

Summary

Seeing the tire pressure light while tires look fine usually means the TPMS has detected a small, non-visible issue or a fault within the system. Start by verifying all tires are at the correct cold pressure, consider a system relearn if indicated, and seek professional diagnostics if the light persists. Proper TPMS maintenance contributes to safe driving and helps prevent unexpected tire failures.

How much should it cost to replace a tire pressure sensor?

Replacing a single tire pressure sensor (TPMS) typically costs $50 to $250, depending on factors like the vehicle make and model, sensor type, and labor costs. Replacing all four sensors can be more cost-effective per sensor, with total costs potentially ranging from $400 to over $950 depending on whether you buy OEM or aftermarket parts and the labor rate of the shop. 
Cost breakdown

• Parts: A single sensor can cost anywhere from $20 to over $100, with OEM sensors being more expensive than aftermarket options. 
• Labor: Expect to pay between $50 and $100 in labor per sensor for installation. Some shops may offer package deals for replacing all four at once. 
• Total cost for one sensor: Combining parts and labor, the cost for one sensor can range from $50 to $250. 
• Total cost for all four: Replacing all four sensors could cost $400 to $950 or more, especially at a dealership. 

How to save money

• Purchase parts yourself: Buy your own sensors from a parts store or online and have a tire shop install them. 
• Wait for new tires: If you plan to get new tires soon, replace the TPMS sensors at the same time to combine labor costs. 
• Shop around: Get quotes from different independent mechanics and tire shops, as prices can vary significantly. 

Other considerations

• Aftermarket vs. OEM: Aftermarket sensors can be cheaper, but they may have compatibility issues or a shorter lifespan. 
• Vehicle make and model: Luxury or newer vehicles may require more expensive or specialized sensors. 
• DIY: If you have the right tools, you can replace the sensor yourself, but you'll need a special tool to activate the new sensor after installation. 

How do I get my tire pressure light off?

To turn off your tire pressure light, first, inflate all tires (including the spare, if applicable) to the manufacturer's recommended pressure, found on the sticker inside the driver's door. Then, drive for several minutes; for many cars, the light will turn off automatically after the system recalibrates at speeds over 20 mph. If the light remains on, you may need to manually reset it using the TPMS reset button (usually located under the steering wheel) or by performing a specific procedure like disconnecting the battery. 
1. Adjust tire pressure 

• Find the correct tire pressure for your vehicle, which is listed on a sticker inside the driver's side door jamb. 
• Inflate all four tires to the recommended PSI. Don't forget to check and adjust the spare tire as well, if it has a sensor. 

You can watch this video to see how to reset the tire pressure indicator: 45sHondaYouTube · Aug 7, 2023
2. Drive and let the system recalibrate 

• After inflating the tires, drive the vehicle for about 10 minutes. 
• Many systems will automatically recalibrate and turn off the light after driving at speeds over 20 mph. 

3. Manually reset the system (if needed) 

• Locate the TPMS reset button. It's often on the dashboard under the steering wheel, but consult your owner's manual if you can't find it. 
• Turn the key to the "On" position without starting the engine. 
• Press and hold the TPMS reset button until the tire pressure light blinks three times, then release it. 
• Start the car and drive for about 20 minutes to allow the system to refresh. 

4. If the light persists

• If the light is still on, re-check the tire pressure and look for any slow leaks. 
• If a flashing light indicates a system malfunction, or if the light won't go off after trying these steps, the sensors may need professional inspection or replacement. 

Can I still drive if my tire pressure light is on?

You can drive with the tire pressure light on, but you should do so cautiously and for only a short distance to find an air source to check your tires as soon as possible. Low tire pressure is a safety hazard that can cause poor handling, longer braking distances, and a risk of a tire blowout. If the light is blinking, it indicates a system malfunction that may require professional inspection. 
What to do if the light comes on

• If the light is steady: Pull over at the next safe opportunity and check your tire pressure with a gauge. If you find an underinflated tire, inflate it to the recommended level (found on a sticker on the driver's side doorframe or in your owner's manual). The light should turn off after driving a short distance. 
• If the light is blinking: This could mean there's a problem with the Tire Pressure Monitoring System (TPMS) itself, such as a faulty sensor or low battery. While the tires' pressure might still be okay, the system is not functioning correctly and will not warn you of actual low pressure. It is recommended to have a professional inspect the system. 
• Regardless of the light's state: It's a good habit to check your tire pressure manually once a month to ensure they are properly inflated, as the TPMS is a warning system, not a replacement for regular checks. 

Why you should not ignore the light

• Safety: Driving on underinflated tires is dangerous, increasing the risk of losing control of the vehicle. 
• Tire wear: Underinflation can cause premature and uneven wear on your tires, leading to a shorter lifespan. 
• Fuel efficiency: Properly inflated tires improve your car's fuel efficiency. 
• Cost: Neglecting the issue can lead to more costly repairs for your tires or vehicle components. 

Why is my low tire pressure light on but my tire pressure is normal?

If your tire pressure light is on but your tires are fine, it's likely due to a malfunctioning TPMS sensor, a need to recalibrate the system after a tire rotation, or an overinflated tire. You should first confirm the tire pressure with a reliable gauge and recalibrate the system if the pressure is correct, as described in your owner's manual. If the problem persists, have a professional inspect the TPMS sensors, as they can fail due to age, damage, or a dead battery.
 
Potential causes and solutions 
This video explains four common reasons why the tire pressure light may be on even when the tires seem fine: 46sMaxTheCarGuyYouTube · Mar 6, 2023
1. Incorrect tire pressure

• Problem: Even if tires look fine, they may be overinflated or slightly underinflated. 
• Solution: Use a high-quality tire pressure gauge to check the pressure in all four tires, including the spare if it has a sensor. Inflate them to the recommended PSI found on the sticker in your driver's side door jamb. 

2. TPMS system malfunction

• Problem: The system may be giving a false reading due to a faulty sensor, a dead sensor battery, or a general electronic issue. 
• Solution: After checking the pressure, try to reset the system. This often involves a specific sequence of turning the ignition on and off or pressing a button on the dashboard. If that doesn't work, a professional needs to diagnose and replace the faulty sensor. 

3. Recent tire service

• Problem: A recent tire rotation or replacement can trigger the light because the sensors may have been inadvertently damaged or need to relearn the new wheel positions. 
• Solution: After confirming the correct pressure, drive your car for about 10-20 minutes at a consistent speed. This may allow the system to automatically recalibrate itself. If not, a mechanic may need to perform an external recalibration. 

4. Overinflated tires

• Problem: The light can also come on if the tires are significantly overinflated, not just underinflated. 
• Solution: Check the pressure and let some air out until the tires reach the recommended PSI. 

This video shows how to reset the tire pressure light on vehicles with a display audio system: 1mHondaYouTube · May 15, 2019
Important safety note

• Do not ignore the light: Even if your tires look fine, low pressure can still cause hidden damage over time, and a malfunctioning sensor still means you won't get an accurate reading if a real problem occurs. It's crucial to get the system checked to ensure your tires are safe and properly inflated.