My 03 F250 7.3 will not shift into 4x4.

Asked by Nov 19, 2016 at 09:48 AM about the 2003 Ford F-250 Super Duty XLT 4WD Crew Cab SB

Question type: Maintenance & Repair

It showed a code of P720 ( speed output sensor malfunction) I replaced that,
still nothing. The only power going to the selector switch is to the light. Is
there a 4x4 control module that powers the switch? Or does it all go through
the PCM? Any help is appreciated,parts are to expensive to just start
swapping

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