FYI…
There is a known TSB for repairs to loose/improperly fitted electrical pins in a harness for this issue. I am speaking about some harness some where, and the pins do not fully seat in the plug prior to being plugged in OR the pins are becoming dislodged during plugging the plug in/falling out. My assumption is… new platform, new plugs/harness, new pins don’t retain in plugs as good as prior stuff, I assume more plastics, less metals, and cheaper plugs. As a EE this is an issue with many cars and also my work. Pin retention is paramount and vehicles are subjected to worse conditions than multi million dollar industrial equipment.
I live in a rural area, travel back roads that are not perfect. The vibration and jarring from these roads I suspect has caused a bunch of my issues. There is a certain 4 way stop intersection that has each road intersecting at different, steep angles which cause the body to twist during the crossing. Due to this intersection being in the middle of nowhere/clear line of sight, it gets rolled through sometimes around 5-10mph. I have had several error lights (power steering, 4wd, abs, cross path, etc..) come on at/during/shortly after this intersection. Multiple events, at separate times at the same intersection. I suspect a harness is being pulled somewhere/pins not fully seated. Highway/city only folks probably never have such issues. I know a few folks with severe issue, live in rural areas, not sure about other posting above. If your wife travels roads that are not smooth, this might be be impacting you.
There are multiple communication networks inside the vehicle, the fastest operates at 500Kb/s (0.5Mb/s) and a split second interruption is all it takes. We are not speaking about a pin pulling free, just a minor momentary contact loss causes an entire module to go offline and lockout, requiring a dealer reset. This is why sometimes power steering remains despite the error, and sometimes it is totally gone. The equivalent of a browser 404 error while surfing the web and then instantly reappears. The vehicle network is fail safe and simply locks out the module due to comms/power/module failure.