U0121

The U0121 communication error in a Tesla Model 3 (2017-2023) indicates a loss of communication with a control module, potentially affecting functionality in various vehicle systems.

The U0121 code in a Tesla Model 3 (2017-2023) indicates a communication issue between the vehicle's control modules, specifically that the "Lost Communication with Anti-lock Brake System (ABS) Control Module" has been detected.

The U0121 code indicates a communication issue between the vehicle's control modules, specifically indicating that the vehicle's ECU is unable to communicate with the Anti-lock Brake System (ABS) control module in a Tesla Model 3 (2017-2023).

The U0121 code indicates a loss of communication with the anti-lock brake system (ABS) module in a Tesla Model 3 (2017-2023).

The U0121 code indicates a communication issue with the vehicle's battery management system in a Tesla Model 3 Highland (2024-present). This code typically signifies that the vehicle's control modules cannot communicate properly with each other, potentially impacting the vehicle's performance and safety features.

The U0121 code in a 2024 Tesla Model 3 Highland indicates a loss of communication with the Steering Angle Sensor (SAS). This communication issue can affect the functionality of various driver assistance systems.