To the previous poster...

I'm no expert on these cars, but it sounds like your batteries are getting too warm. I would look in the trunk, take the backing off in front of the batteries, and make sure there is air flow from the vent. The batteries are cooled from the vent behind the rear seats. Make sure nothing is blocking it. Perhaps there is a filter system which needs cleaning? The trunk lining can be removed pretty easily by pulling the center from the small round clips. Once the center is pulled, the clips can be removed. They can be re-installed by reversing this process.

Keep in mind the conditions which warm up the batteries.
1. Hot temps inside the cab
2. Fast charging
3. Fast discharging

VDC I assume means "Volts Direct Current", which may mean the 12V system. There are 2 DC/DC converters. One to charge the 12V battery. and one converts to 42VDC for power steering. Once again, if your 12V battery is having problems, it will overwork the DC/DC converter. One is located in the trunk with the batteries. If this is getting hot, chances are the batteries are too.

Personally I would throw a smart charger on the 12V battery. You may have to remove a cable to eliminate any draw on the battery for the charger to properly "read" the battery condition. I have already heard of several problems that were a direct result of a bad 12V battery. And one poster claimed that Nissan has a different replacement battery as a result.

ON EDIT: Well, when all else fails, RTFM. I looked and VDC stands for "vehicle dynamic control". One interesting thing that is in the owners manual.

"The light also comes on when the power of the 12V battery is reduced or the battery cable is disconnected."

It gets late early out there. - Yogi