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  1. K

    2013 LML Reverse Only, No forward

    So it does it in 4lo/4hi ranges as well. Shift inhibited. Going to toss an nsbu in this weekend for shits and giggles. If it still does it guess I will be investigating transfer case afterward. Anybody see a chance the BCM is the issue? Also as far as the -40 Trans temp reading, I know its...
  2. K

    2013 LML Reverse Only, No forward

    Yes, VB is clean.. no sticking valves. I mean it is clean clean. The fluid has been clean this whole time. I was curious on the possibility of a TC issue as well. BUT why would it be normal in reverse and have no go in drive if it was a TC issue id think itd have issues both ways correct? So...
  3. K

    2013 LML Reverse Only, No forward

    Did some more playing around with the truck with a different ECM, found no faults in wiring harness and still displaying trans temp of -40. Does anybody know the BCM role in shift range inhibited/trans temp sensor logic? Have some EFI logs if anybody is interested in looking I can email them...
  4. K

    2013 LML Reverse Only, No forward

    Results of unplugging harness I cannot get any gear, no reverse, no forward. Plugged in, I get reverse only. This condition was the reason for dissassembly and inspection. Essentially chain of events was: 1) p0776, cleared code and only had reverse + shift inhibit in drive. New...
  5. K

    2013 LML Reverse Only, No forward

    Hey yall thank you for replies! So I did leave that part out... Tried starting truck, unpluging connector and shifting to reverse/forward... In my case I get nothing... unplugged harness I get no codes either. My gear underline dissappears, no reverse or drive unplugged. So I get no turbine...
  6. K

    2013 LML Reverse Only, No forward

    Thanks for the info, but looks to be about the 6L series.
  7. K

    2013 LML Reverse Only, No forward

    Hey all, new here but long time Duramax fanatic and fiddler. I have had some issues with my LML trans and can't seem to figure out where to go next, looking for some insight and direction! Any help is appreciated as I am a technician but not an allison guru! Long story and some weird stuff, so...
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