HD new body (DJ 2500 / D2 3500), 2019-2024. Not the DT, which is the 1500.
Key reference: 68375455AA
Diagnostic port location (OBD)
Illustrative — for orientation only.
Under the driver's side of the dash, a little left of the steering column, near the foot parking-brake pedal and just left of the hood-release handle. The black 16-pin connector blends into the dash underside and on some trucks hangs loose on its harness instead of being clipped to the panel, so use a torch. Same place on every 2019-2024 2500/3500 cab and trim including Power Wagon (US trucks are LHD only).
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