ihano reverse when truck gets hot

Question

I have a 2008 Chevy express truck12.500gvw trans was replaced and now when the truck gets hot an hour or so of work I loose reverse two codes have come up p0700 and p0757 shift Sol b stuck on
After I clear codes truck does run better is this possibly a censor?

Answer 1

P0700 Transmission fault detected Mil light requested

P0757 1-2 shift solenoid valve performance

Yes this is a solenoid that causing the condition you have When P0757 occurs you would not even have 4th gear or 3rd gear. May also turn into a internal mechanical condition when ever there is a no reverse gear.