i have an 04 duramax, with allison trans. has a pressure control solenoid code p0776... clear computer... it shift all gears and works great, go about 1/2 mile, and it downshifts to 1st, sometimes looses reverse??, changed solenoids, still same problem. tried to read the file,it stops when it gets to the tcm part.. times out with 75000 error??? any ideas???
read in low speed mode.
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
bill, it keep changing from low speed to high speed on its own... then times out.. i really think there is something wrong with the tcm..?? have you heard of any problems??
try pulling tcm fuse for couple mins, then reinstall and try again. Cannot guarentee it will work but have had some luck with this.
thanks , will try in the morning...
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