Sorry took so long to get back. I was looking for the online shop manual for the trans. I know if you do a search going back a little more then a year ago. There is a link for the 46re trans. Do a search under edpmedic for transmission or band adjustment and I think the link is there. I only have my phone and it's a PITA trying to find it. I think your problem is related to a solenoid on the valve body, but I'm really not sure.
It's one of those scribd on line documents. Maybe you can search for it that way. Also is your overdrive light flashing. I think that is where the trans codes are read by counting the blinks like the CEL.
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