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4L80E Sticks in second when cold

1069 Views 3 Replies 3 Participants Last post by  bmodracer
4L80E Sticks in second when cold...need help

1995 6.5 turbo diesel 4X4 126k

Occasionally when its cold outside the transmission will not shift from second to third. I have found out that if I shut it off and turn it back on it will shift fine. When running a diognstic I get codes 85 & 87. One thing is that I do not get the #12 code. This has been going on for over a year. Any help would be great!!!
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I've read through many threads here about problems with shifts and especially my problem with no O/D until 200 degrees problem which I still haven't figured out but it sounds to me that your B solenoid (2-3) is sticking/defective. I've been told that you should have a reading of 20-40 ohms across this solenoid but I don't have a pinout as of yet. My problem I have determined so far is definately temperature related but as we all know warm oil flows better than cold oil so your valve hanging on the 2-3 until it gets a little warm sounds probable. Located in valve body viewable when pan is removed. 87 is a high ratio code relating to the 2-3. i am not sure about the 85, maybe the transmission goohoos can help out you and me. Mike L. or GMCTD please respond to us, please.
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