P04DB: owner reports and bulletins

Powertrain (generic, all makes). We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got P04DB on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.

What owners report to NHTSA

6 complaints filed with NHTSA mention P04DB, 6 of them since 2015, across 3 different models. The component owners most often filed it under: engine.

Most-reported models

VehicleComplaintsModel years reported
FORD ESCAPE32018, 2019

Manufacturer service bulletins that name P04DB

92 technical service bulletins and manufacturer communications filed with NHTSA mention P04DB, from 9 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • MACK MACK, bulletin 10207038: Mack Chassis - Equipped With An MP8 Engine - Diagnostic Trouble Code ( DTC ) P04DB - Crankcase Ventilation Disconnected; US17+OBD16 And US17+OBD18 Emissions (Common Rail Fuel System), Model Years 2018 And 2019
  • VOLVO VOLVO TRUCK, bulletin 10208587: Diagnostic Trouble Code (DTC) P04DB - Crankcase Ventilation Disconnected; US10+OBD13 To US14+OBD16 Emissions
  • CHEVROLET SILVERADO 3500 (2025), bulletin 11010483: This technical bulletin provides repair information to correct a customer concern of an MIL Illuminated in DIC (with DTCs P2463 and P04DB set).
  • GMC SIERRA 3500 (2025), bulletin 11010483: This technical bulletin provides repair information to correct a customer concern of an MIL Illuminated in DIC (with DTCs P2463 and P04DB set).
  • FORD BRONCO (2023), bulletin 10232421: Some 2023 Bronco vehicles equipped with 2.7L engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P04DB stored in the powertrain control module (PCM). This may be due to a…
  • JEEP GLADIATOR (2021, 2020), bulletin 10193995: Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes (DTCs) P051B ? Crankcase Pressure Sensor Circuit Performance, and/or P04DB ? Crankcase Ventilation System Disconnected, Set After Powertrain Control…

Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.