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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (DTCS P1D94 To U1479 - 8HP70 Automatic Transmission - 1500) >> Diagnosis And Testing >> U0103-Lost Communication With Electric Gear Shift Module >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

The Transmission Control Module (TCM) receives information from the Electronic Shift Module (ESM) over a dedicated CAN C BUS. The CAN C BUS is a high speed communication BUS that allows real time control capability between these controllers.

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