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Old 06-20-2014, 09:57 PM   #1
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Allison tranny problem

Our 05 GMC 3500 diesel has developed a tranny problem- The transmission will downshift and lock up in the gear the tranny selects- I must stop the vehicle and shut the engine off to get the tranny to operate properly- Of course , the "check engine " light comes on and stays on- It has been "repaired" 3 times so far-Any one out there who can shed some light on a solution? THANX in advance for your opinions- DD
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Old 06-21-2014, 07:52 AM   #2
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Do you belong to Diesel Place? You will probably get the answer pretty fast since there are numerous Alllison experts on the forum.
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Old 06-22-2014, 09:47 AM   #3
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I have no knowledge of Diesel Place- I'll give it a try- THANX- DD
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Old 06-26-2014, 04:28 PM   #4
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Sounds like one I worked on back when those first came out. Back then, allison wouldn't allow us (GMC dealer) do anything more than filters and flashes. I ended up replacing the trans in the end... Good luck
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Old 06-26-2014, 05:04 PM   #5
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My old truck had the same thing happen, it ended up being a sensor or something. I can't remember exactly what it was but it was a sensor that counts teeth? or something haha dang CRS. It had to do with rpms and the computer would not count it right and go into limp mode type of thing.

Took me forever to fix it but my neighbor worked on school buses fixed it eventually.
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Old 06-26-2014, 07:04 PM   #6
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My 06 had a similar experience - stick solenoid was the prob and taken care of by the dealer. Head on over to dieselplace.com and do some reading in the trans section. If your close to Western Michigan, Merchant Automotive will have your answer and the right stuff to make an Allison even more bullet proof
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Old 06-26-2014, 07:24 PM   #7
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I'm on my 4th D-max/Ally and have not had any issues, hopefully a simple/inexpensive fix. Either of the forums listed below are equally informative as this one when it comes to all things Duramax.

http://www.dieselplace.com/forum/
http://www.duramaxforum.com/forum/

Good Luck!
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Old 06-26-2014, 09:14 PM   #8
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My work truck had that happen, it went on for a long time before we sent it in. They replaced the transmission but it was still under warranty. I had to drive a smart car while it was in the shop. My back still hurts lol.
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Old 06-27-2014, 10:29 AM   #9
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I didn't have that exact thing happen but the NSBU switch can cause some weird things. It gets corroded and strange things happen

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Old 06-27-2014, 03:38 PM   #10
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Did you ever have the codes checked? If it throws a light it will store a code. You may have to go to the dealer though.
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