Which module would prevent the PRNDL to not display on dash cluster?

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! It sounds like your 2009 Dodge Ram 1500 is putting on a bit of a show with that PRNDL display disappearing act! Since you're hearing the starter relay energize in the TIPM, the issue is likely tied to the Transmission Control Module (TCM) or the TIPM itself. The TCM manages the PRNDL display, so if it's having a bad day, it might not send the signal to the dash cluster. Since you've checked the TIPM and ECM and didn't find any corrosion, I'd focus on the TCM next. A diagnostic scan may reveal more details, especially if there's a communication error. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554!