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Home >> Jeep >> 2011 >> Compass Base, 2.0 A, Automatic CVT >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> U0121-Lost Communication With Antilock Brake Module >> Theory of Operation
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Theory of Operation

The Controller Area Network (CAN) is a high speed serial communication line for multiplex communication between multiple controllers that reside on the network. The Transmission Control Module monitors the transmit and receive message from the CAN BUS.