I would check the electronics in the spare tire well. The radio module (along with various other modules if equipped- Sirius, PDC, self level suspension, trailer module)is located there and most likely that is causing the issue. When this happened to mine this area was just starting to fill with water when I caught it so was able to save the radio module.
Luckily I was able to save all components, with the exception of the Bluetooth ULF, by removing, disassembling and thoroughly drying them out.
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