Generally, you should not ignore a TPMS warning. If the light comes on, pull over safely and check all tires with a reliable gauge, inflating to the vehicle manufacturer’s recommended cold pressure. If the light stays on after inflation or you suspect a sensor fault, arrange service promptly. Drive only as needed to reach a repair location.
What the TPMS light means
The Tire Pressure Monitoring System (TPMS) warns you when tire pressure is too low or when there’s a fault in the system. Most systems trigger a warning when a tire is below the recommended cold pressure by roughly 25% or a specified threshold. A steady light usually signals underinflation, while a flashing light or a separate warning indicator can indicate a TPMS sensor or system fault. After inflating tires to the correct level, some vehicles require a short drive for the system to relearn the new pressures.
Common causes of a TPMS warning
Low tire pressure is the most frequent cause, but leaks, damaged tires, faulty valves, or exhausted TPMS batteries can also trigger the light. If you notice any obvious tire damage, pull over and inspect before continuing.
What to do if the TPMS light comes on
To address the warning and reduce safety risk, follow these steps.
- Check the tire pressures on all four tires (and the spare, if applicable) when the tires are cold. Use the recommended cold inflation pressures listed on the door jamb sticker or in the owner's manual.
- Inflate tires to the recommended pressures. Recheck after driving a short distance to allow the tires to warm and the readings to settle.
- Inspect tires for visible damage, punctures, bulges, or slow leaks; also check valve stems for leaks.
- If any tire is significantly underinflated or damaged, do not drive far and arrange service or replacement as soon as possible.
- If the light persists after inflation or you suspect a TPMS fault, have the system diagnosed and reset if required. Some vehicles need sensor relearning after tire work or rotation.
Bottom line: Address underinflation promptly. If inflation to specification does not extinguish the light, seek professional service to diagnose a potential TPMS fault.
Is it safe to drive with the TPMS light on?
Safety depends on why the warning is on. If it’s due to underinflation, driving on underinflated tires can compromise handling, increase wear, and raise the risk of a blowout. If it’s a sensor or system fault, you may still be able to drive short distances, but you should not rely on the warning and should have the system checked as soon as possible.
- Drive slowly and smoothly; avoid aggressive acceleration, sharp turns, and hard braking.
- Keep speeds moderate and plan for longer stopping distances; monitor the tire pressures again after a short drive.
- Avoid long trips and heavy loads until the tires are properly inflated and the TPMS is confirmed functional.
- Check for any signs of tire damage or rapid air loss; if you notice a problem, stop and seek help.
To minimize risk if you must move the vehicle to a repair location, follow these precautions:
Bottom line: If the warning persists after confirming proper tire pressures or you’re unsure of the cause, seek professional diagnostic service to ensure both tires and the TPMS are functioning correctly.
When to schedule service
Sensor faults or maintenance
TPMS sensors can fail due to depleted batteries, damaged valves, or issues with the system electronics. If the light remains on after inflating tires to the correct pressures, or if readings are inconsistent, schedule a diagnostic with a tire or automotive service professional. In many vehicles, a relearn procedure is required after tire changes or wheel rotation.
Summary
The TPMS light is an important safety signal. Treat it seriously: verify tire pressures, inflate to the recommended cold values, and have the system checked if the light stays on. Drive only as needed to reach a service location, and avoid long trips until you know the tires and TPMS are functioning properly.