This is a tire pressure reset tool designed to assist in the sensor relearn procedure. After each tire rotation, tire change, body control module replacement, or tire pressure sensor replacement, the sensor relearn process must be performed to ensure accurate tire pressure readings and proper display.Operation steps: 1. Ensure the vehicle is in TPMS learning mode. 2. Follow the vehicle manufacturers maintenance procedure. Hold the tool near each tire (front left, front right, rear right, rear left) close to the valve stem and press the reset button. 3. The green LED (TX light) will illuminate, indicating signal transmission. When the vehicles horn or buzzer sounds, the matching is successful. 4. Repeat the process for each remaining tire.Specifications: - Compact and portable design - Enables real-time tire pressure monitoring compatibility - For use with vehicles requiring a relearn procedure after tire service - Equipped with diagnostic sensing functionality - Universal compatibility with most vehicles For GM vehicles equipped with 315 MHz or 433 MHz Tire Pressure Monitoring (TPM) systems, a sensor relearn procedure is required after tire rotation, remote keyless entry receiver module replacement, or tire pressure sensor replacement. This procedure can be completed using compatible tools such as EL-50448 and applies to 2012 and later models, including 2014 GM vehicles.Package Included: 1 x Tire pressure reset instrument