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CAN bus technology remains the backbone of in-vehicle networking. The emerging CAN bus 3.0 framework builds on classic CAN and CAN FD by increasing data bandwidth, improving error detection, and supporting advanced driver-assistance systems. For technicians, this means updated diagnostic procedures, faster firmware flashing, and more precise fault isolation. This article reviews the main changes, compares frame formats, and explains how service tools can interpret the expanded message payloads. It also covers common wiring considerations and validation steps for ensuring reliable communication in modern vehicles.