A tire pressure control system for a vehicle has a supply of compressed air connected to a vehicle tire through an air conduit having a valve and an air pressure sensor that senses the air pressure in the vehicle tire. A microcontroller is connected to control the valve to supply compressed air to the vehicle tire or to vent compressed air from the vehicle tire. The microcontroller has instructions to: calculate a valve operation required to achieve a target pressure; operate the valve according to the calculated valve operation; measure an adjusted air pressure after the calculated valve operation is completed; calculate a further valve operation to achieve the target pressure if necessary; and compare the results of the valve operation to the calculated valve operation and recalibrating the algorithm based on any differences.