Diagnosing Triangle of Death Prius

This vehicle happens to be a 2005 Prius and the check engine light came on so reached for OBD2 adapter and started diagnosing the problem.

[@perniciousprogressive8333]

I run all sorts of apps on my too fancy for me Launch scanner; Dr. Prius, TechStream, Hybrid Asst., but haven't tried Torque yet. As an aside, bought one of my Prii (all Gen2) w/ red triangle of death from a guy who had the local Toyota dealer diagnose for him ($160). They told him he needed a new transmission??? I didn't argue and just paid him. Changed fluids, installed a new 12 volt battery (old one was only holding 12.2 under load), charged & discharged the hybrid battery five times and wha'dya know? Shifts fine, cleared all DTC's w/ my Launch scanner, and reported zero codes. That was 28,000 miles ago and it's still running like a champ. I do run Motul synthetic & change every 5,000 miles, so that helps. :)