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6.5 turbo 2500 4x4 4l80e tranny works perfect while cold after a couple of stops, will not shift out of 1st.Turn truck off most times problem gone then it works fine all day.Had truck at 3 tranny shops all said speed sencer code replaced 2, exact same problem all times any ideas ???
In some? (maybe all) GM units there is a drac? (black box) Not sure on spelling. It recives the speed sensor info and splits it to cruise, engine comp, trans comp, and diagnostic conector. You could have a wiring problem from the sensor(most likely) or a bad drac. From there bad trans comp, etc. The code should say wiring or sensor problem. Its also posible the guy installing them is damaging them or there is a mechanical problem with the trigger wheel where it gets to far away or quits spininng. Good Luck
email don gervais
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