He guys, I need some advice. I recently added a UPR dual valve catch can, and an AFE dual filter CAI. I drove the truck for approximately 2000 miles with no problems, and then it threw the CEL code P04DB. I checked all the fittings and installation of the catch can, making sure the check valves are facing the correct way and everything is installed correctly and tight. It was correct from the start. I contacted Stage 3 first which is where I purchased the aftermarket stuff from and they gave me the number of UPR. UPR guys was super knowledgeable and knew right off what code was being thrown and why. Basically said it is due to increased air from stock and the CAI is to blame. He said a restriction pipe will fix the problem and I didn't know what he was referring to. I contacted AFE via a contact from on their website and told them what issue I was having. Without any response or correspondence a little plastic pipe is shipped to my doorstep that goes down in a PCV type fitting on the drivers side of the engine. The original kit came with this same pipe and it is already installed. I have searched and can't find a number for AFE to speak with someone about this directly, just their generic "contact us" form.
Do any of you have a fix for this who have both a catch can and the intake? Should I take one or the other off? I really don't want to as I think both of them are good additions.
Please let me know if you can help give me some direction.

Thanks
))--SLIVER-->

 

P04DB - Crankcase Ventilation System Disconnected

Description: This DTC sets when the crankcase pressure sensor is disconnected.

Possible Causes:

1. Disconnected hose from crankcase to one side of the crankcase pressure sensor
2. Disconnected hose from intake manifold to one side of the crankcase pressure sensor
3. Damaged or pinched PCV hose o-ring seal
4. Damaged dipstick o-ring seal
5. Incorrectly installed dipstick
6. Incorrectly installed oil cap
7. Disconnected or damaged vacuum lines between the engine and any vacuum operated components

 

Update. I found the number for the sales department of AFE and they linked me to the technical department. They recommend I remove the old "plastic pipe" and install the new one, ensuring the bevel is oriented correctly, clear the code and run again. They said they have had a 100% success rate with the "plastic pipe" correcting the issue.
I'll do this and update you all.

52merc, thanks for the info. If this fixes it then great, if not, i'll most definitely take a look at those items.

))--SLIVER-->

 

I just got my ‘18 F150
servicee yesterday and was driving today, the check engine light came on and I decided to hook up my reader. Popped up with this code and I popped the hood and investigated. Comes to find out, one do the crankcase breather hoses was disconnected. Hooked it up, cleared the code and started it up and it’s been gone so far! Cross my fingers!

 

any update? I am now throwing the same code. Have the jlt catch can and afe cai. Little plastic tube is in and oriented properly. Truck skips bad when in boost. Throws that code

 

Just throwing this out there for information. I threw a P04DB code recently. No mods. 2018 F150 Lariat 2.7 Eco - Cleared the code via ODB, code came right back. Checked all settings, oil cap, filter, dipstick, air blockage, etc.. Finally came across some diesel forum that mentioned oil levels, and I had an 'aha' moment. I had just changed my oil like 4 days prior to throwing this code. Checked the dipstick level, oil was a little high. I drained about 3/4qt out and brought the level to the full point mark on the dipstick. Cleared the code with the ODB and viola. It's been 3 days now, no code.
At oil change added 6qts in which is the proper amount in documentation, but I guess with some residual in there, it was too high. I do change my own oil, full synthetic. Next time, I'm going to stick it on ramps and pay closer attention.

 

So I installed the injen twin intake on my 2015 3.5l and I couldn't figure out where to put the pcv restriction tube (different from 17 and up) and my truck ended up throwing the p04db code any help on hiw to fix it?

 

Been a year I know but quick question: how high was "a little high?" Got same code on 2019 2 7 and cant find a problem, but dispstick shows a tad high also. Thing is, its been 6 months since last oil change and hood hasn't so much as been opened since then, with no problems, and suddenly I get this code today. Thanks

 

Do any of you have a photo of the PVC restriction tube that is being mentioned?

 

Fast forward to about 4:35 to see the restriction tube.