What does code U0121 mean?

Lost Communication With ABS Control Module: Communication with the ABS module has been lost. ABS and traction control disabled.

U0121 is rated as high severity. Address soon — may cause further damage.

U0121

Lost Communication With ABS Control Module

Network Code · High

What does U0121 mean?

Communication with the ABS module has been lost. ABS and traction control disabled.

System: Module Communication

U0121 is a network diagnostic trouble code indicating lost communication with abs control module. This code is classified as high severity, which means: address soon — may cause further damage.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.