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93 6.5 with 4l80e limp mode no codes

Messages
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Location
Mitchell,indiana
Thread starter #1
Greetings from Mitchell,Indiana
My 17 year old son just bought a 93 k2500 4x4 with 6.5. While driving it it shift perfect. (Maybe a little converter chater)
Stop to fuel with truck running. Pull away ans is in 2nd ans will not come out. No codes or anything. Changed 2 selenoids worked perfect for about 40 miles. Stopped and same thing. Cleaned harnesses drove good and then same thing. It has to be something simple. Can you pull codes dorectly from tranny? As none are coming thru obd1
Thanks in advance
Matthew
 

Will L.

Well-Known Member
Messages
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7,519
Location
Boulder City Nv
#4
Welcome.

That is 2nd gear “limp” mode. Should be it resets every time you restart the engine. Mine did it on and off for a while, if I downshifted when stopping it wouldn’t happen. Turned out for me that when I was doing a trans filter swap, I pinched the wires inside the trans. Examine the transmission wiring harness closely, chaffing will ground out on outside of trans and cause same issue.
 

THEFERMANATOR

FRANKENBURBAN
Staff member
Lead Moderator
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Location
ZEPHYRHILLS FL
Staff #6
As said above, 2nd gear only is limp mode. I'm not sure if you need a scanner to read codes or not since it's only a trans controller and a ECM, i don't recall if theres even a service engine light or not for 91-93 4l80e equipped diesel trucks. You could have a loss of power to the trans or controller, bad ground, poor connection at the trans plug, TPS, temp sensor, speed sensor, and so on. You gotta find out what its seeing to go furthur with it.
 
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