How to Check Tire PressureFind target. Check cold. Adjust safely.

Guides · How to Check Tire Pressure

What To Do When the Tire Pressure Light Is On

A solid TPMS light means measure the tires now. A blinking light can mean a system fault. Check pressure before you reset.

Short answer

A solid tire pressure light means at least one tire is likely below the warning threshold. Measure all four plus the spare if equipped, then inflate to the door-label cold PSI. A light that blinks for about a minute and then stays on can mean a sensor or system fault, not just low air.

Do not chase the light with a reset button. The light is the symptom. The measurement is the job. Park, read the label, and gauge each tire. Many drivers only check the tire that looks low and miss a second corner.

After the pressures match the label, the lamp may need a short drive to go out. Some vehicles also need a manual reset. If the light returns the next morning, you have a leak. If it never goes out, you may have a dead sensor, a recent wheel change, or a compact spare that the system does not like.

A blinking sequence is different from a steady lamp. Follow the owner manual for that pattern. Continue to measure the tires anyway; a failed sensor does not prove the tire is fine.

Winter mornings produce a wave of TPMS lights that are simple cold loss. That is still a real low-pressure condition. Add air to the label. Do not disable the warning.

Step-by-step

  1. 1Note whether the lamp is solid, blinking, or paired with a message.
  2. 2Measure every tire against the door-label cold PSI.
  3. 3Inflate or inspect before you touch reset.
  4. 4Drive a short distance and see if the lamp clears.
  5. 5If it stays on or returns, inspect for a leak or sensor fault.

Common mistakes

Reset without measuring The light will come back, or worse, stay quiet on a low tire.

Inflating to the sidewall That overshoots the vehicle target.

Ignoring a blinking lamp That pattern can be a system fault plus a real pressure problem.

Safety notes

If the car feels unstable or a tire looks flat, do not keep driving to 'see if the light goes off.'

FAQ

Why did the light come on overnight? Cold air drops PSI. Measure before you assume a puncture.

Can I reset it at the gas station? Only after the tires match the label.

Related next steps

Blinking TPMS lightSystem fault versus low air.TPMS troubleshooterSort the next action.Add airCorrect a low tire.