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92 gmc 3500 4L80E tranny problem frank stone 4-2-10  
This tranny is locked in 2nd or limp mode. does anybody know if there is a problem spot in the harness that may be doing this I know the trannys good and it is going in and out of limp mode. everytime i get a scanner on it would run fine with maybe a output speed sensor code but ive replaced it. next is the ecm.
Re: 92 gmc 3500 4L80E tranny problem BUBBA THE BUS TECH 4-5-10  
Don't replace thge ECM, they do fail but it is rare.
Just keep watching it. The speed sensor code is a good clue to limp in mode.
The trans will only go to limp in if the trans wiring conector is disconected or there is a problem that the computer has picked up on.
Good Luck
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