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The switch reporting which range the transfer case is in, faulty. It is the position feedback rather than the actuator, and a module that cannot confirm the range will not act — engaging low range at the wrong moment is mechanically damaging.

The complaint is a range selector that does nothing, with a transfer case that is mechanically fine. The reverse fault is worse: a switch reporting a range that is not engaged lets the module act on a wrong belief, and on some vehicles inhibits the transmission. Its position under the vehicle is what fails it — road spray, salt and heat — so a corroded connector is likelier than a failed switch. Watch the reported range through a full shift, since a switch that flickers or reports two states will pass a static check.