2006 Dodge Ram 3500 SLT 5.9L Cummins

Won’t start, died on the road. Had code P2509, changed batteries, checked all fuses next to battery and they were good. Disconnected fan clutch harness and still doesn’t start but nor connector pin is corroded off, the code scanner shows 84 psi fuel pressure but I am unsure about whether this is accurate since the truck is not running. What would my next step be in diagnosing the problem?

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  1. P2509 Dodge – Engine Control Module/Powertrain Control Module Power Input Signal Intermittent

    Possible causes
    – Engine Control Module/Powertrain Control Module poor electrical connection
    – Low battery voltage
    – Poor battery connection

    TSB 18-001-07

    Flash: Check Gauges Lamp Illuminates For Alternator Charging With DTC P2502, P2503,
    or P2509
    This bulletin involves selectively erasing and reprogramming the Powertrain Control
    Module (Cummins PCM) with new software.

    Did you recently add any equipment that required grounding on the fender ground bolt? That ground in particular is sensitive to alteration and can cause that code if not tightened enough when reinstalled. Located pretty much right in the middle of the battery on the drivers side fender. It bolts right through with a 10 or 12mm bolt I think.

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