HGS surprisingly did not give any codes. I wanted to actually test 4<>5 , Did it you get a code when the switch was faulty?
My thought is that the engine stalling at low speed/load has something to do with the intake which I read 5th selection is dependent on. Also, ABS light on + cruise control my guess is that it is due to rear abs sensor / hall effect sensor fault code.

I will test and proceed to provide updates.