Your car is signaling a tire pressure issue detected by the TPMS—likely one or more tires are underinflated, or there is a fault in a tire pressure sensor.
What the warning means
The tire pressure monitoring system (TPMS) helps prevent unsafe driving by monitoring air pressure in each tire. When pressure falls below a safe threshold, or when a sensor is faulty or needs recalibration, the system lights up or displays a message on the dashboard.
Direct TPMS vs Indirect TPMS
Direct TPMS uses actual pressure sensors mounted in each wheel. Indirect TPMS estimates pressure using wheel-speed sensors and ABS data. Direct systems report the exact tire pressures and can warn about individual tires, while indirect systems are less precise and may require recalibration after tire changes or rotation.
What can trigger the warning
Here's a quick run-down of typical causes that can trigger or keep TPMS alerts on.
- Underinflated tire: One or more tires are below the vehicle’s recommended pressure, due to cold weather, slow leaks, punctures, or heavy loads.
- Temperature changes: Cold air reduces tire pressure; roughly 1 psi drop for every 10°F drop in ambient temperature.
- Slow leaks or punctures: Nails, screws, or bead leaks can gradually lower pressure without obvious tread damage.
- Sensor or calibration issues: Direct TPMS sensors can fail or lose battery charge; indirect TPMS may need recalibration after tire work.
- Recent tire service: Rotations, replacements, or tire sealant use can trigger a need for TPMS reset or recalibration.
In practice, the warning indicates something related to tire pressure or the sensing system; if you inflate a tire to the recommended level and the light remains, further inspection is advised.
What to do when you see the warning
Follow these steps to address the issue safely and effectively.
- Check all tires’ pressures when they are cold using a reliable gauge. Compare readings to the placard on the driver’s door jamb or the owner's manual.
- Inflate each tire to the recommended pressure. Do not inflate to the maximum sidewall pressure printed on the tire; this is not the target for normal operation.
- Inspect tires for damage, punctures, bulges, or nails. Look at sidewalls and tread closely; if you find damage, replace or repair as needed.
- Drive a short distance and re-check the pressures. TPMS can re-evaluate after driving and may switch the light off if pressures remain normal.
- If the warning persists after proper inflation, have the TPMS sensors and calibration checked by a technician. There could be a slow leak that’s hard to see or a faulty sensor/battery.
- Consider having your tire services performed by a shop that can reset or recalibrate the TPMS after tire changes, rotations, or sensor work.
Keeping tires properly inflated improves fuel efficiency, handling, tire wear, and overall safety. Don’t ignore a TPMS warning, even if it goes away after inflation, and seek professional diagnostics if it returns.
Seasonal considerations and maintenance tips
Temperature shifts, weather, and driving conditions can influence tire pressure. In cold months, check tires more often and keep a portable gauge in the car. Regularly rotate tires and replace aging sensors as recommended by your vehicle manufacturer.
Summary
TPMS warnings are a crucial safety feature. They commonly indicate underinflated tires, a slow leak, or a fault with the sensing system. By checking and correcting tire pressure to the manufacturer’s specification, inspecting for damage, and seeking service when needed, you maintain safer, more efficient driving and extend tire life.