What does it mean when your car says Service tire Monitor system?
This usually means the tires in question are 25 percent below the recommended amount of air pressure. Sometimes your tires are just fine. Like all parts, monitors can wear out or just plain break.
How do you reset the tire pressure sensor on a 2015 GMC Terrain?
How do I fix my service tire monitor?
Hold the TPMS reset button until the tire pressure light blinks three times, then release it. Start the car and let it run for 20 minutes, which allows the sensors to reset. You’ll find the tire pressure monitor reset button located beneath the steering wheel.