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Home >> Jeep >> 2009 >> Wrangler X, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 ((Transmission Control Module (TCM) - Electrical Diagnostics)) >> DTC Troubleshooting >> U0002-Can C Bus Off Performance >> Theory of Operation

Theory of Operation

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Some NGC controllers communicate with other controllers over the CAN C Bus. The transmission controller 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.