Hello, did you figure out anything on this? I am interested too!

I solved my issue. I think his issue is that the Pyro fuse is blown out. I suggest you open the penthouse and do a quick check. Msg 20A looks fine to me! Also HVIL sense will always be 0 as long as Main HV contactor is in open state.

Hello,
Any experience with HVIL (High Voltage Interlock Loop) issues on model 3 battery pack?

I have a full tesla model 3 battery pack from a salvaged car. Besides replacing pyro fuse, no internal modifications.

I've used raspberry pi zero and evtv candue to send and read messages from battery ...