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You have said that your GPR circuit is modified. If you want to return it to stock, you need to remove the switch and determine how the PO modified the circuit. Your PCM could be the issue, but asking on here about a specific modification done to your truck will not provide you the best answer. We can only guess what was done to your truck and how it was done.
Trace the wires at the switch and see if you can figure out what the PO did. That is your best bet really.
2002 F-350 CCLB 4X4, HD4R100 , 4" Diamond Eye exhaust, Powerslot rotors, ATS Ported Compressor Housing, DP Tuner-F6, Autoenginuity, EEC-V Breakout Box, KCM S.S. HPX Line, S&B Filters intake, Quad Autometer gauge pod, Inovations canopy, Banks Big Head wastegate actuator, 6.0L Trans Cooler, Spin-on Transmission filter with custom bracket, Zoo-dad, Dieselsite Coolant Filter, Cobra 29LTD/NW CB, DVD and always looking to do more...
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