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LLY GM Duramax Discussion of the 2nd Generation Duramax and Gm truck

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Old 08-20-2016, 10:44 AM   #1
aksparkey01

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Alison codes after trans removal

I had a bad ring gear and I'm not verry knowledgable on the duramax or Allison so I had a mechanic put a new flywheel and ring gear on for me. After the install it is throwing trans code p0872 now. It also threw p0842 but that one seemed to clear for now. Any ideas on what would be going on?
Thanks for the help
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Old 08-20-2016, 07:57 PM   #2
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4X4? Any leaks at the rear of the trans now? I've seen guys break the rear housing causing the "E" shift solenoid code. More likely that the 20 way pig tail has a backed out terminal and or poor pin fit. Also if the transmission internal harness has been leaking into the main chassis harness and it was moved around it could have shorted the wires (very very common on the Allison!!!) AND the very best part is that GM nor Allison sells that pig tail, BUT if you get to a wrecking yard cut two connectors out from a 4L60/4L80 and build your own. Same connector but only pinned out for 11/12 rather than the Allison 20 wires it needs.

Did he/she do anything besides replace the flexplate?

Make sure the dip stick is at the top of cold and that after it gets warm is in the middle/top of hot. Allison is a pre-Madona about fluid level.

Report back if none of that is the case, I can get you schematics so you can start testing wires.
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Old 08-22-2016, 11:14 AM   #3
aksparkey01

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yes its a 4x4, not sure on any of the rest yet as the mechanic still has the truck. He only pulled the trans to install the new ring gear and didn't get into the trans. probably something to do with the harness I would guess.
thanks
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Old 08-22-2016, 11:39 AM   #4
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What year?
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Old 08-22-2016, 12:38 PM   #5
aksparkey01

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2004.5
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Old 02-03-2017, 12:42 PM   #6
aksparkey01

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It was the internal harness. Fyi
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