Is it OK to drive with TPMS light on?
Generally, you should not ignore a TPMS warning. If it signals under-inflation, inflate to the recommended tire pressure and drive to a service station. If it indicates a TPMS fault, have the system diagnosed promptly. Driving long distances with the warning illuminated can compromise tire safety and vehicle handling.
Understanding TPMS warnings
TPMS warnings come in two common forms: a low tire pressure warning and a TPMS fault indicator. A low-pressure alert means one or more tires are significantly underinflated relative to the vehicle’s recommended pressure. The threshold varies by vehicle but is often around 20-25% below the recommended level or below the system’s preset minimum. A fault indicator signals a problem with the TPMS itself—such as a sensor, battery, or communications issue—that requires diagnostic service. Knowing which type you’re seeing helps determine the right course of action.
Direct vs indirect TPMS
Direct TPMS measures actual tire pressures with sensors mounted in each wheel and reports precise readings to the vehicle’s computer. Indirect TPMS uses the ABS/ESC wheel-speed sensors to infer underinflation by comparing rotational speeds; it does not display exact psi values and may be slower to respond to pressure changes. Some cars combine both systems, or allow driver interaction to view individual tire pressures on the display.
What to do if the TPMS light comes on
Before taking action, consider your immediate surroundings and the vehicle’s condition. The steps below are designed to be practical and safe for most drivers.
- Check all tires with a reliable gauge, including the spare if applicable. Compare each tire’s pressure to the recommended cold-inflation pressure listed on the door placard or in the owner's manual.
- If any tire is below the recommended pressure, inflate it to the specified value. Do not overinflate, and check for signs of damage such as cracks or bulges. If a tire cannot be inflated to the proper pressure due to damage, stop and seek assistance.
- Inspect tires for obvious causes of leaks or damage—punctures, nails, cuts, or slow leaks. If you suspect a slow leak, monitor the tire and consider professional inspection if the pressure drops again quickly.
- After inflating, drive cautiously to allow the system to re-learn or reset. Some vehicles require a manual TPMS reset after inflating or rotating tires; consult the owner’s manual for exact steps.
- If the light remains on after inflation or you suspect a faulty sensor, schedule a diagnostic with a qualified technician. A persistent TPMS fault can indicate a failed sensor, a dead sensor battery, or a module issue that needs repair or replacement.
In many cases, inflating a low tire will turn the light off once the system re-learns the correct pressure. If the light stays on despite proper inflation, do not assume the tire is safe to drive long distances—seek professional inspection promptly.
Safety considerations and practical tips
The safety risk from driving with a TPMS warning depends on the cause. A legitimately underinflated tire reduces handling, increases rolling resistance, and raises the risk of a blowout, especially at higher speeds or in adverse conditions. If you are on a highway or in poor weather, reduce speed, avoid hard braking or sudden maneuvers, and head to the nearest safe stopping point or service center as soon as possible. If you notice a visibly flat or damaged tire, stop immediately and arrange assistance rather than continuing to drive.
When to stop and call for assistance
If you cannot inflate a tire to the correct pressure, hear a hissing sound, or see obvious tire damage, stop and seek roadside assistance. Similarly, if a TPMS warning appears after a tire rotation or replacement and the light does not reset, a professional inspection is warranted to verify sensor function and system integrity.
Summary
A TPMS warning is a critical safety signal. Treat a low-tire alert as a prompt to check tire pressures and inspect tires; treat a TPMS fault alert as a signal to diagnose the monitoring system. In either case, limit driving to reach a safe location and obtain professional service as needed. Regular tire maintenance—proper inflation, routine inspections, and sensor checks—helps prevent TPMS warnings and keeps you and your vehicle safer on the road.
