skylogger wrote:To me, it sounds like some other new fault has been introduced. [...] I think to go farther, you really need access to a MUT III, or get a dealer to run a scan on your car to see what the new fault actually is before you can go forward.
My carsoft i909 (MUT alternative) turned up yesterday, and it read an active P1A15 error code. So that gives us an idea of where the issue lies. It is indeed a new error code. The service manual suggests to check wiring harnesses and the 280A fuse in the battery pack. It also suggests a CAN bus test, which I'm not sure if I can perform with an i909. My plan is to read through anything related to the diagnostic steps in the service manual, and see what I can figure out. I don't really want to go back to the dealer to pay to get codes read off it, plus at the moment it would need to get towed there.