U0121 — Lost Communication With Anti-Lock Brake System (ABS) Control Module

Q: What does fault code U0121 mean?

U0121 means: Lost Communication With Anti-Lock Brake System (ABS) Control Module. It is a Network (CAN bus, communication) fault code defined by the OBD-II standard.

Q: Can I keep driving with U0121?

With U0121 you can usually drive home and book an inspection within a few days unless the car feels abnormal.

Network (CAN bus, communication)

Lost Communication With Anti-Lock Brake System (ABS) Control Module

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Can I drive with U0121?

You can usually drive home and book an inspection within a few days.

Frequently asked questions

What does fault code U0121 mean?

U0121 means Lost Communication With Anti-Lock Brake System (ABS) Control Module.

Can I keep driving with U0121?

You can usually drive home and book an inspection within a few days.

Related fault codes

U0120 — Lost Communication With Stereo Multi-channel Amplifier
U0122 — Lost Communication With Vehicle Dynamics Control Module
U0123 — Lost Communication With Yaw Rate Sensor Module
U0124 — Lost Communication With Lateral Acceleration Sensor Module
U0125 — Lost Communication With Multi-axis Acceleration Sensor Module
U0126 — Lost Communication With Steering Angle Sensor Module
U0127 — Lost Communication With Tire Pressure Monitor Module
U0128 — Lost Communication With Park Brake Control Module
U0129 — Lost Communication With Brake System Control Module

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