Code U0101 - Chevy and GMC Duramax Diesel Forum
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post #1 of 5 (permalink) Old 12-25-2009, 06:27 PM Thread Starter
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Code U0101

I just searched the archives for info on this code and still don't have all the answers I need.
My truck is a 2006 Silverado with the Allison Automatic. I currently display code U0101 which returns almost immediately after clearing it.
The tranny shifts fine thru all the gears when in the automatic mode but will not shift manually.
I bought a used TCM (transmission control module} and installed it ,but that did not solve the problem.
Question 1. Does the computer need to be flashed by the dealer EVERY TIME a new TCM is installed?
Question 2.Has anyone else on this forum experienced the same problem,and if so what was the solution?
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post #2 of 5 (permalink) Old 12-25-2009, 07:27 PM
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Check battery voltage, make sure they are in good shape and charged. Do you have any aftermarket remote start on the truck? If so remove and then test.

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post #3 of 5 (permalink) Old 12-25-2009, 07:34 PM Thread Starter
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No aftermarket stuff. one battery was replaced a couple of weeks ago. the other one tested good .
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post #4 of 5 (permalink) Old 12-25-2009, 08:26 PM
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Not a good idea to only replace one battery-- the weaker will pull the good battery down -- so you will have two weak batteries.

The batteries are wired together to make one big battery. You should reconsider and replace the old one.

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post #5 of 5 (permalink) Old 12-26-2009, 06:37 AM Thread Starter
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The old battery is not really very old,about ,1 year, and it tests fine. anyway enough about batteries, does anyone have any ideas about the problem I am experiencing?
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