TPMS Reset Tool Relearn Auto Car Tire Pressure Sensor for GM Vehicle 2021 Tire Pressure Monitor Sensor TPMS Activation Tool For vehicles equipped with a 315 or 433 MHz Tire Pressure Monitoring (TPM) system, a "Sensor Re-Learn Procedure" must be performed after tire rotations, Remote Control Door Lock Receiver Module replacement or Tire Pressure Sensor replacement. This re-learn procedure can be performed by using special tool. How to use: The tire pressure sensor on models in and after 2012 can be read, only with some specified diagnostic tools. Before tire pressure monitoring system works normally properly, the body control module will record ID information of each position in the tire pressure sensor; and use the following methods to read the tire pressure sensor. After replacing a tire or wheel speed sensor. Please refer to the specific methods as follows: Step 1 - Enter leaning mode >Set the gearshift lever to "P" >Put the ignition switch to "ON" >Enter the interface of tire pressure display by DIC >DIC shows "Press Set / Ctrl to re-learn" >Press "Set / Ctrl" >The turn signal is lighted for 3 seconds and the horn beep sound twice to enter the learning mode Step 2 - Read tire pressure sensor information >Start from the front-left wheel >Make the Diagnostic Tool antenna up against the valve core position & close to the rim of the tire sidewall >This tire pressure tool starts by the start switch >Successful to read the tire pressure sensor information when the horn bleeps once Step 3 - Same method to read other tire pressure information >Follow the instruction above to read tire pussure of the front-right, rear-right, rear-left wheels >Turn signals is lighted for 3 seconds and the horn bleeps twice when the learning is complete Packing List: 1*TPMS Reset Tool NOTE: The package does not include the charger and battery, please buy them by yourself