Another possible issue you can have, because this is what happened to me: Trunk seal failed and water was getting down in the tire well area in the trunk, to the tune of about 6 inches of water.
The rear diff electronics are back there, as well as the power steering and the battery. All of mine were half submerged.
I first had the power steering go out, and then the rear diff error.
After the water was cleared and the modules replaced it is back to normal (I also had the rear trunk seal replaced.
So check under the rear carpet to see if you have water in the well. If so that is most likely the issue.
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