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 procedure must be performed to ensure accurate tire pressure reading and display.Operation steps: 1. Ensure the vehicle is in TPMS learning state or mode. 2. Following the vehicle manufacturers instructions, use the tool sequentially (front left, front right, rear right, rear left), positioning it near the tire sidewall close to the valve stem and press the reset button. 3. The green LED (TX light) will illuminate, indicating signal transmission. When a vehicle horn or chime is heard, the programming is successful. 4. Repeat the process for the remaining tires.Specifications: - Compact and portable design - Real-time tire pressure monitoring capability - Diagnostic sensing function - Compatible with most vehicles equipped with TPMS systems - For GM vehicles with 315 MHz or 433 MHz Tire Pressure Monitoring (TPM) systems, the 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 and applies to 2012 and later models, including 2014 GM vehicles. - Note: Only specific diagnostic tools can read tire pressure sensor data on 2012 and newer models.Package Included: 1 x Tire pressure reset instrument