A yellow exclamation mark on your car's dashboard almost always means there is an issue with your Tire Pressure Monitoring System (TPMS). It's a warning that one or more of your tires are significantly underinflated. While it's not as immediately critical as a red warning light, you should address it promptly for safety, fuel efficiency, and tire longevity.
The symbol looks like a horseshoe-shaped tire with an exclamation point in the center. When it illuminates, it means the pressure in at least one tire has dropped typically 25% or more below the recommended level. The first step is to manually check the pressure in all four tires, including the spare if it's equipped with a sensor, using a reliable tire gauge. Compare the readings to the manufacturer's recommended PSI, which is found on a sticker inside the driver's door jamb, not on the tire sidewall.
Once you've identified and inflated the low tire to the correct pressure, the light should turn off after driving a short distance. If it remains on, the tire may have a slow leak, a sensor could be faulty, or a recent tire rotation may require the TPMS system to be recalibrated. Consistently driving on underinflated tires increases rolling resistance, reducing your miles per gallon and causing uneven tread wear that shortens tire life.
| Vehicle Type | Typical Recommended PSI Range | Common TPMS Warning Trigger (Approx. PSI Drop) |
|---|
| Sedans & Compact Cars | 32 - 35 PSI | 8-9 PSI |
| SUVs & Light Trucks | 35 - 40 PSI | 9-10 PSI |
| Performance Cars | 40 - 45 PSI | 10-11 PSI |
| Electric Vehicles (EVs) | 40 - 45 PSI (higher due to battery weight) | 10-11 PSI |
| Winter Conditions | Pressure can drop 1 PSI for every 10°F decrease | Warning may illuminate on a cold morning |
