Truck wont start; no park,neutral, or drive indication. checked all fuses, changed starter relay, has power to starter. 12v. no power to solenoid when key is turned to start position.

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checked solenoid under dash that engages a hole in shaft for shifting position; it works... no light of position of gear on dash board screen. I'm thinking it won't start because it is not thinking it is in the park or neutral position. I just don't know what to change to fix this. ???The module on transmission??