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Home >> Dodge and Ram >> 2011 >> Challenger R/T Plus, EZH >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> U1401-Implausible Engine Speed Signal Received >> Theory Of Operation
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Theory Of Operation

The messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of bytes for each ID.