LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Dodge and Ram >> 2009 >> Journey SE, ED3 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> U0121-Lost Communication With Anti-Lock Brake Module >> Theory Of Operation
October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Theory Of Operation

The Transmission Control Module (TCM) communicates over the CAN C BUS and continuously monitors BUS activity. The TCM requires data from several control modules for information needed for normal functionality. If this DTC sets, the TCM can still communicate with other modules besides the module identified in the DTC.