If you see a message that says Check TPM system on your car's display, it means that the Tire Pressure Monitoring (TPM) system is not working properly. The TPM system is responsible for monitoring the pressure in your tires and sending a warning signal to the driver if the pressure gets too low. If the TPM system is not working, it could mean that one or more of your tires are low on air, which could lead to a flat tire or other problems.