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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 ((Transmission Control Module (TCM) - Electrical Diagnostics - As68RC Automatic Transmission)) >> DTC Troubleshooting >> U0121-Lost Communication With Anti-Lock Brake Module >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The Transmission Control Module (TCM) continuously monitors the Bus activity and receives the messages it needs.