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U0101 Diagnostic Trouble Code Discussion for April 2021

Lost Communication With TCM


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Trouble Ticket Help Requests for DTC U0101
Help Request Posted
2006 Chevrolet Cobalt LS 2.2L No Communication VIN: 1G1AK15F76
U0101: TCM Non Communication- Initial Trouble Code. initial diagnosis-not shifting properly-flaring & skipping gears- no comm with TCM, PCM code U101, On install of new GM TCM & program attempt (with battery charger attached under hood B & top of shock tower)- got sparks from a different bolt at...
April 29, 2021