U0121 Code EXPLAINED: Lost Communication With ABS Module (Fix It Fast)
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YouTube8020 Automotive
U0121 Code EXPLAINED: Lost Communication With ABS Module (Fix It Fast)
In this video, he breaks down fault code U0121 (Lost Communication With ABS Module) by explaining what it means and how the PCM/ECM, ABS, BCM, and other modules communicate over the vehicle network (usually CAN). He covers the symptoms you’ll see and the broad cause categories, then walks through a simple diagnostic plan: scan all modules to ...
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