Bit of a stange one missing and back firing

[Poodle]

Theres something not right with your electricals somewhere, I only ever see that voltage code when theres unexplained shenanigans going on. Any issue with cam and/or crank sensors brings up codes in my experience, so wouldn't expect it to be that. Will be tedious, but i'd suggest going over your loom looking for any wire damage and bad connections. Bear in mind the hdi has a tendency to cut out when the ecu sees something it doesn't like, voltage drops included.