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93 GMC diesel 4L80E - 3 codes on 1-2 shift
Posted to Transmission Forum on 2/4/1999

Hello All,

I have a 4l80e that gets 3 codes on an early 1-2shift,it has all gears. 85:undefined ratio,86:solonoid b stuck on,87:solonoid b stuck off. Snapon scanner also says Range A volts from PSM are zero in all ranges.I rebuilt the trans,changed both shif... Login to read more.