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U0101 Diagnostic Trouble Code Discussion for July 2026

Lost Communication With TCM


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Trouble Ticket Help Requests for DTC U0101
Help Request Posted
2012 Ram 5500 ST 6.7L MIL Lamp on, can low VIN: 3C7WDNALXC
U0101: . can bus hooked up on break out box, we get can low and can high, then we lose can low. voltage on both are 2.44 vdc. the terminating resister are at 61.4 ohms. driving when it gets hot it starts setting the above comm cods (abs, tcm ) for no communication....
July 01, 2026