2005 duramax lly
when i drive down the highway and accelerate then decel, it constantly throws my truck into limp mode but does not show a code. i hook up my cheap code reader and hit erase it runs fine again. im told the cause is from the transfer case, but when i get codes there tranny codes p0746 p01174 p02563 p0700 p0763. what could be the cause?