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pok 08-09-2006, 04:57 PM Transmission Control Module (TCM) MIL Request Circuit That is what the lookup tool told me it was but I was wondering what this meant for the truck and my wallet? What am I looking at here? Thanks WanaDmxsub 08-09-2006, 10:01 PM A search for "TCM" will give you a TON of info. IIRC They fail alot...usually in the rain. Easy to change out, so I've read... Can be purchase at an Allison dealer or some of our supporting vendors sell them also. Bodysurfer 08-09-2006, 10:12 PM A search for "TCM" will give you a TON of info. IIRC They fail alot...usually in the rain. Easy to change out, so I've read... Can be purchase at an Allison dealer or some of our supporting vendors sell them also. WanaDmxsub,Do you think his NUBS is failing? (http://www.gmdieseltech.com/store2/cart.php?target=product&action=view&product_id=16197&category_id=278 pok, what problems, if any, are you having with the tanny? WanaDmxsub 08-10-2006, 01:17 AM Problems? Me? Got bored of predator 120 tune as a daily driver...got a VA230....that lasted 2 weeks before I stacked it with predator 65...decided 33.6 psi of boost was a little to high for a stock turbo so now I'm down to the VA230 stacked with the predator 45...and it's all because of the dam tranny...:rolleyes: :lol: WanaDmxsub 08-10-2006, 01:38 AM Sorry for the highjack pok I may have jumped the gun with saying that the NSBU is bad. I can't find P1781 in any of my service manuals..Provide some more info and post this in the tranny forum. MikeL will most likely be able to help you out. WanaDmxsub 08-10-2006, 01:44 AM Here this should help http://dieselplace.com/forum/showthread.php?t=29518&highlight=P1781 pok 08-10-2006, 11:32 AM I have not noticed the truck driving any differently, though it has been starting a little slower and that linked thread said it could be from a weak battery among other things. I guess I will check the batteries first and work from there. I searched 1781 and I could not find much to help me. | ||