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Home >> Jeep >> 2018 >> Grand Cherokee Laredo, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 33 ((Electronic Shift Module (ESM) - Electrical Diagnostics - 8HP70)) >> DTC Troubleshooting >> U0101-08-Lost Communication With TCM-Bus Signal / Message Failures >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different variant/trim than selected.

The purpose of the diagnostic is to monitor the transmitted messages on the CAN BUS and the validity of the CAN signals. The Electronic Shift Module (ESM) performs various internal tests to verify proper controller operation. This DTC indicates there is an issue with the communication with the Transmission Control module (TCM).

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