Tire Pressure Light (TPMS) On
Check at the next safe stop
Usually this is a slow leak or seasonal pressure drop — check and inflate at the next gas station. A light paired with a visibly low tire, a thumping sound, or handling changes means pull over now.
What it means
The tire pressure monitoring system (TPMS) light — the horseshoe-with-exclamation-mark symbol — means at least one tire has dropped meaningfully below its recommended pressure (in many systems, around 25% low). Cold snaps commonly trigger it, because tire pressure drops as temperature falls.
A flashing TPMS light at startup (on many vehicles, flashing for over a minute then staying solid) typically indicates a fault in the monitoring system itself — often a dead sensor battery — rather than low pressure. Check your owner's manual for your car's specific behaviour.
Snap a photo of your dashboard and Rev — GarageHub's AI mechanic — identifies the warning light and tells you what to do next.
Likely causes
| Cause | Likelihood | Severity |
|---|---|---|
| Cold weather pressure drop Pressure falls with temperature. The first cold morning of the season lights up TPMS lights everywhere. | Most common | Minor |
| Slow leak (nail, screw, or valve stem) If one tire needs topping up every week or two, find the leak — most punctures in the tread are repairable. | Common | Moderate |
| Dead TPMS sensor battery Sensor batteries last roughly 5–10 years and aren't replaceable separately on most designs — the sensor gets replaced. | Common | Minor |
| Rapid air loss / tire damage If the car suddenly feels different or you hear rhythmic noise, stop and look immediately. | Less common | Serious |
| System not reset after tire work Some vehicles need a TPMS relearn/reset after rotation or new tires. | Common | Minor |
DIY checks before the shop
- Check all four tires (and the spare, if it has a sensor) with a gauge against the pressures on the driver's door jamb placard.
- Inspect the low tire's tread for nails or screws and the valve stem for cracks.
- Inflate to placard pressure and watch over the next days: holding pressure = temperature blip; dropping again = leak.
- Note the light's behaviour at startup — steady means low pressure; a flash-then-solid pattern on many cars means a sensor/system fault (see your manual).
What repairs typically cost
| Repair | Typical range |
|---|---|
| Air top-up Most common fix. | Free–$2 |
| Puncture repair (plug/patch) Repairable if in the tread and not too large; sidewall damage means replacement. | Roughly $20–$50 |
| TPMS sensor replacement (each) Varies by vehicle; often done during a tire change to save labor. | Roughly $50–$150 installed |
Ranges are broad US-typical estimates for common vehicles at independent shops. Luxury brands, dealers, and regional labor rates can land well outside them — treat these as orientation, not quotes.
Rev knows your specific vehicle and service history — describe the symptom and get advice for your car, not a generic answer.
Frequently asked questions
Can I drive with the tire pressure light on?
To the nearest air pump, yes — cautiously. Meaningfully under-inflated tires overheat, wear fast, and handle worse, so don't make a habit of it, and stop immediately if the car feels off.
Why did the light come on when it got cold?
Tire pressure drops as temperature falls — a hard overnight cold snap can be enough to cross the warning threshold on tires that were fine the day before. Top up to the placard pressure.
The tires are fine but the light stays on — why?
Suspect the system: a dead sensor battery, a sensor damaged during tire work, or a needed reset/relearn. A shop with a TPMS tool can read which sensor is failing.
