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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 ((Transmission Control Module (TCM) - Electrical Diagnostics - As68RC Automatic Transmission)) >> Diagnosis and Testing >> U0100-Lost Communication With ECM / Pcm >> Theory of Operation

Theory of Operation

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 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. The CAN C Bus is also used to communicate transmission MIL status to the Engine Controller. If the Engine Controller is unable to communicate with the Transmission Controller, the Engine Controller will light the MIL.

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