DTC (Diagnostic Trouble Codes) codes that begin with "U" are specifically related to communication issues between the different electronic modules in a vehicle. These codes typically indicate failures within control networks, such as the CAN (Controller Area Network) system. To understand and diagnose these errors, it is essential to consult the complete list of "U" codes available in this article.

DTC Codes (Diagnostic Trouble Codes) are essential for diagnosing issues in modern vehicles. Since the 1980s, they have allowed you to quickly identify anomalies using an OBD-II scanner. The DTC codes, categorized into types P, B, C, and U, cover various systems of your vehicle. To understand the importance of these codes and how they work, discover our comprehensive guide.