Tire pressure light
A horseshoe shape with an exclamation mark, amber
Get it looked at soon · Amber means get it checked
Tire Pressure Light
You don't need to pull over right now, but check your tire pressures within the next day or so, and sooner if you can see or feel that a tire looks low. Drive normally in the meantime, just avoid highway speeds if one tire seems visibly soft.
This light means the car's tire pressure monitoring system has detected that one or more tires is below the pressure it expects. Each tire has a sensor that reports pressure back to the car, and when a reading drops far enough, the light comes on to tell you before it becomes a bigger problem, like a blowout or uneven tire wear.
What Usually Causes It
Most of the time it is exactly what it looks like: one tire has lost air, either from a slow leak, a nail or screw picked up on the road, or a valve stem that is starting to fail. Check that tire first.
The other very common cause has nothing wrong with the tire at all. Air contracts as it cools, so when temperatures drop, especially the first cold snap of the fall, every tire on the car loses a few psi at the same time. This is why the light often comes on for the whole car at once in October or November rather than just one corner. If all four tires read a little low and roughly even, this is probably what happened.
Less often, the sensor battery itself is weak or the sensor has failed, which shows up as a reading that doesn't match reality, or a light that won't reset even after you've corrected the pressure.
What It Takes To Fix
If it's just low air, filling the tire to the pressure listed on the sticker inside the driver's door (not the number molded into the tire itself) usually clears the light within a few minutes of driving. If one tire keeps losing air, it likely has a puncture or a leak at the valve stem and needs to come off the rim to be checked and patched or have the stem replaced.
If the pressures are correct and the light still won't clear, the sensor may need to be reset, rebattery, or replaced. That's a quick diagnostic check rather than a major repair, but it does take a scan tool to confirm which sensor is at fault before doing anything to it.