Code P04DB

2018 FORD MUSTANG

19,738 MILES • 2.7L • 4 CYL • TURBO • 2WD • MANUAL

JESSE39007

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I have the car listed above eco boost, with only a cold air intake installed. I was driving home from work and the check engine light came on. So, I plugged in my OBD reader and the code P04DB appeared, and it says Crankcase Ventilation System Disconnected. Any idea what I can change or mess with to fix?

Jun 6, 2022 at 5:36 AM

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SQM

CAR REPAIR CONTRIBUTOR
6,383 POSTS

Hello,

The code
P04DB - Crankcase Ventilation System Disconnected

It can get triggered due to a few different reasons.
It could be due to the disconnected hose from the crankcase to one side of the crankcase pressure sensor, disconnected hose from the intake manifold to the pressure sensor, damaged PCV hose O-ring seal, disconnected vacuum lines. It can also get triggered due to an incorrectly installed oil cap.

I have attached the trouble shooting guide for the code below. Follow those steps as it can help you determine the issue.

Let me know of any questions.
Thank you.

Images (Click to enlarge)

Jun 6, 2022 at 7:35 AM