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Discussion Starter #1
The U0101 is lost communication with TCM. The truck shifts hard from 1-2 and 2-3 and the in 3rd bogging clunky grinding sound. Replaced with a new TCM and same story... Anybody had these codes come up with the same tranny issue?
 

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Lost communication with TCM you should be checking power, ground, and comm. circuits to TCM. Just had one of these last week that had the main engine harness chafed through on the driver's upper control arm. I think there is a bulletin describing this issue if I remember right. Look through the driver's front wheel well and check the engine harness that runs near the upper control arm area and make sure it is rubbing on anything. If it is check further for broken or chafed wires.
 
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