GM 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 EL-50448.Also works on 2014 GM models EL-50448 Tire Pressure Monitor Sensor TPMS Activation Tool OEC-T5 The tire pressure sensor on models in & 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: EL-50448 instructions: EL50448 works on all General Motors (Buick, Cadillac, Chevrolet, GMC) products manufactured for the North American market. It won't work if you've purchased aftermarket sensors that are the wrong frequency. EL50448 fit for G.M most kind of vehicles, equipped with a 315 or 433 MHz Tire Pressure Monitoring (TPM) system. This re-learn procedure can be performed by using special tool EL-50448. EL-50448 Specification: Item Height:10 inch Item Width:15 inch Item Length:20 inch Item Weight:0.3kg Hardware Version:OEC-T5 Software Version:EL-50448 External Testing Certification:CE Material Type:High quality plastic & metal How to use EL 50448 TPMS Activation Tool 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 J-46079 or Diagnostic Tool EL-50448 antenna up against the valve core position & close to the rim of the tire sidewall El-50448 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 instuction 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. For certain vehicles equipped with a 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 50448