Not sure if this is your problem, but here is the TSB
Not sure if this is your problem, but here is the TSB
Your primary wheels are aluminum and use a conical (acorn) seat lugnut. All spares are mounted on painted steel wheels. They use the same lugnut but you will see some of the cone because there's no deeply machined seat on the steel wheel. When used by themselves, steel wheels get an open ended acorn lugnut with shallower cone but it's the same angle.
I just got word from the dealer today, as expected, the transmission is dead and will be replaced. How long that takes remains a question for the future. The electronic module that controls the transmission also controls some camera functions, which is why my trailer cameras were not working—eleven days for the diagnosis. I'll let you know what happens next. Thanks to all for the support!
They are tracking these transmission failures on HDRams forum if you feel like participating.