[AlexanderOnline]

Yes, around 2015 the transmission valve body was redesigned, and is typically what causes the transmission fail. The valve body controls all hydraulics the operate the torque converters and conical pulleys in the CVT. So when it malfunctions, the CVT does not shift correctly. After the redesign, the CVT became much more reliable.

Thanks for the explanation - I was trying to understand what this part does and came across your post.
I experience judders (2014 QX60, 100k, bought few months ago), but only when I go uphill and speed between 20-30 mph. Mentioned it during my first service, was hoping a software update would apply (read that somewhere in the forum), but the diagnostics was 'P17F1' which seems to imply a required valve body replacement (looks like ITB15-012 backs that up). From what they explained to me, it should be replaced regardless of the judder (which i might be able to live with).
$1200... ouch.