Working on a 2011 2wd silverado P0C77 and won`t start. I work for GM and there is basically no one left there to help with this issue. I`m not experienced on this system as we very rarely see one. I am very familiar with EV and other hybrids.
PIM , BECM,Battery has been replaced. was towed in no start P0C77.I have not tried jump assist yet. Has new and rechecked good 12V battery. all hybrid batteries 15.2 at rest.
If anyone has been through thisb I would greatly appreciate any help

 

you're probably passed working in this, but I've seen people talk about setting the crash fault causing a no start from trying to jump start or putting a battery charger on the 12v battery. needs a tech 2 to clear it.

 

Try this handy dandy hybrid Diagnostics file