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95 C/k Chevy 2500 Stuck In Limp Mode


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this problem has been a reacurring one for some time. it started out as my truck sometimes going into safe mode. I scanned it code for the first two shift solenoids came up. had a tranny specialist change them and truck shifted fine for a little bit but went back into safe mode. took it back it showed up with a quad mod code so i got a new tcm ( he went through three tcm's to get one to work). ran fine wouldnt shift a week later. i unplugged the computer to make sure that nothing was loose broken or bent everything was fine and it shifted good for another week. finally it went back into safe mode again and the speedo jumped around aswell as tach gauge. I changed the vss buffer with one i got at a scrap yard from an identical truck and it shifted fine when i changed it but only because i unplugged eveyrthing so im sure it reset itself but it shifted like it should when it was reset. any more ideas on what it could be

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