Code: P2C90 - Crankcase Ventilation System - Hose 'A' Disconnected on 2025 Explorer ST with Fen Fab V2 Intake

[BigBenTX]

I'm curious if anyone has seen this code before? I have a 2025 Explorer ST with the Fen Fab V2 Intake, CVFab Intercooler with Hot/Cold Pipes installed as well as the Big Mouth intake.
I looked and don't see any loose connectors that are causing it or anything disconnected as the code says.

 

[Ckeith42]

I’m having the same code. Have you figured anything out?

 

[BigBenTX]

I’m having the same code. Have you figured anything out?

Not yet, what modifications have you done? Seeing if we have any common mods. Are you a 2025?

 

[Ckeith42]

Not yet, what modifications have you done? Seeing if we have any common mods. Are you a 2025?

I have the Fen Fab V2 Intake, Fen Fab Hot/Cold Pipes, CVFab Intercooler and Thermal Exhaust.

 

[Ckeith42]

I have the Fen Fab V2 Intake, Fen Fab Hot/Cold Pipes, CVFab Intercooler and Thermal Exhaust. [/QUOTE

do you know if those things will void the warranty? Have you tried the dealer?

 

[DaHuntah]

I doubt you would have an issue with just those mods but it's always a risk modifying a car still under warranty.

 

[BigBenTX]

I have the Fen Fab V2 Intake, Fen Fab Hot/Cold Pipes, CVFab Intercooler and Thermal Exhaust.

I’ve got the same except for exhaust. I never got the code until I put the Fen Fav V2 Intake on. Then it pops it occasionally on a long extended pull from a stop to acceleration onto a freeway onramp

 

[James902]

did anyone ever figure this out???

 

[UNBROKEN]

Plenty of 2025 cars with no issues and that CAI…same goes for 20-24 cars.
It’s been proven about 99% of the time it’s an installer error somewhere along the way. Rarely has it been a part issue. Double and triple check every aspect of your install…even if it “looks” good…get hands on and make sure it IS good.

 

[dneumannjr]

@BigBenTX any resolution on this? I just got this recently and not sure what's up. I have similar mods, but they have been on the car for some time now. Just looking to see what you found if anything.

 

[Cblack14]

I just installed the fenfab v2 and first test drive this code P2C90 came up. Any resolution?

 

[NAiLs]

I installed my V2 a couple of weeks ago and also got this same code just now (I don't drive much)... Pretty annoyed to see people say it's an "installer error" and offer no suggestions other than the obvious that has already been done by everyone. Also, this isn't my first rodeo nor my first ST with an intake on it.

All of my connections look great and tight. The only one that I may have skipped on is the hose that goes from their silly 3D printed part to the intake pipe. I carefully slapped a zip tie on the 3D printed side, ensured it was tighter, but I'm afraid of this part breaking because it wasn't designed and printed well. I also am debating on shortening the hose that came with, because it feels a wee bit long and that may contribute to the issue. This 3D printed part is the only weird part of this intake, otherwise it's awesome.

I've got a little driving to do today and will see if the light turns off after the zip tie.


Edit 5/11/25
Drove 100-ish miles yesterday, with a few key cycles, and another 60 today. I ended up resetting the code yesterday after most of my driving and will observe if this thing comes back... but so far so good.

 

[MikeThomas]

This code popped for me after 3k miles on the FFV2. Cleared it and came back 1,000mi later. I reassured it’s all well, if the computer thinks the PCV hose is disconnected, would that indicate too much vacuum because it’s not seeing any pressure in the crankcase?