P04DB on the 2015 Mack LR
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| KC-492 | 2022-03-03. Service bulletin. Diagnostic Trouble Code (DTC) P04DB - Crankcase Ventilation Disconnected; US10+OBD13 To US14+OBD16 Emissions |
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| K23884537 | 2019-12-09. Service bulletin. Diagnostic Trouble Code (DTC) P04DB - Crankcase Ventilation Disconnected; US10+OBD13 To US14+OBD16 Emissions (Non-Common Rail Fuel System), Common Model Years 2014 To 2017 |
2 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.