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International Automotive Technicians Network

U0101 Diagnostic Trouble Code Discussion for June 2015

Lost Communication With TCM


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Trouble Ticket Help Requests for DTC U0101
Help Request Posted
2006 Chevrolet Cobalt LT 2.2L MIL Lamp on VIN: 1G1AL55F66
U0101: PCM Lost com with TCM. Hi all in IATN land. I need some help with this one. I haven't been able to program this AC Delco TCM. It makes it to 80% and fails. I get an error code on the Tech 2.Line 2 error 35 and line 0 error 00. I thought it was a bus problem but I can talk to the PCM...
June 29, 2015