ABS/DSC trouble code 5F3A

[est36]

I have a 04 x3 2.5 liter with the abs and 4x4 lights on. I get a code 5F3A
from the ABS controller. I can't communicate with the transfer case module even though I have 8 volts on the k-line back at the transfer case control module. I installed a used controller out of a x3 with the same production date but it still has the same problem.