Transmission acting weird - Diesel Bombers

Chevy/GMC Duramax 04.5-05 LLY Discussion of Chevy and GMC Trucks with LLY Duramax Turbo Diesel Engines

Transmission acting weird

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Old 10-11-2017, 07:46 PM
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Default Transmission acting weird

Hello guys I have a 2005 GMC Sierra duramax 6.6 LLY I recently went to do a trans relearn on the truck (now before I get into detail on the issue I want to clarify that the truck did not do this before I hit trans relearn) so I hit trans relearn on the tuner On the truck, and now every time on the 3-4 shift the truck kicks into neutral but if I let off the throttle it will shift, if I don’t it will kick into limp mode and stay in third gear, and earlier today I pulled over to shut truck off and clear the code, the truck wouldn’t go into park it would only go to neutral wouldn’t even go to reverse so I left it in neutral and cleared the code which is the tcm illumination code and then continued to drive home please help me guys
 
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Old 05-17-2018, 03:46 PM
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Last edited by gunman41mag; 05-17-2018 at 06:01 PM.

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