2007 Silverado 2500 HD Duramax throwing a Code U01 in the morning when it's "Really Cold".


New member
Nov 10, 2020
SoCal Mountains (Wrightwood)
I live in the SoCal mountains at about 5000 feet elevation. The last 2 mornings it has been in the 20's when I leave for work. Both days my truck has had a U01; Lost communication with TCM error upon startup. I clear it via my Edge Diesel Programmer and it's fine. Any ideas on what this might be? Is there a common problem relating to what ever is doing this?

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