If you see a TPMS light on your car's dash, it means that there is an issue with the Tire Pressure Monitoring System. The system is designed to monitor the pressure in your tires and alert you when it gets too low. Driving with a TPMS light on is not recommended because it means that the system is not working properly and you could have a flat tire or other issue without knowing it. If you do have to drive with the TPMS light on, be sure to check your tire pressure regularly and stop as soon as possible to get the problem fixed.