July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Detection Condition

DTC P1729 indicates 4WD shift control switch failure, either open or shorted.
DTC P1781 indicates 4WD position (closed) during KOEO self-test.

4WD low switch provides an indication of when 4WD transfer case gear system is in low range. PCM modifies the shift schedule for 4X4L transfer case gear ratio.