My 2020 f150 XLT EcoBoost has 39k miles.
has K&N cold air intake
borla atak exhaust
turbosmart blow off valve
diablosport trinity ex tuner with custom tunes built for truck

when I accelerate from still it’s fine but when I accelerate from say 60 and floor it. The truck goes into limp ish mode and looses power. First time didn’t throw a code. So I pulled over and switch cycled and cleared the wrench light.
then when it did it again it threw p04db which is crank ventilation tube sensor and threw wrench again

my question is I’m reading a lot about when adding a cold air to the air EcoBoost a tube is required to go in the crank ventilation to prevent the code. Is this true and will this cause truck to go in limp?

also what else could cause my issue? Thanks in advance

also to add just bought this truck used to other boosted vehicles from another brand and haven’t dealt with issues like this before. Also truck came with all parts installed so don’t have any original equipment to be able to try reverting back to factory

 

add ons. turbos need back pressure to operate properly.

 

so what would be best suggestion I looked at exhaust still has a resonator and muffler

 

P04DB - Crankcase Ventiltion System Disconnected

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

Possible Causes:

• Disconnected hose from crankcase to one side of the crankcase pressure sensor
• Disconnected hose from intake manifold to one side of the crankcase pressure sensor
• Damaged or pinched PCV hose o-ring seal
• Damaged dipstick o-ring seal
• Incorrectly installed dipstick
• Incorrectly installed oil cap
• Disconnected or damaged vacuum lines between the engine and any vacuum operated components

 

Thank you. I have already checked all that. But I’ve read online where cold air intakes for our truck require a restriction tube or it sends to much pressure to the sensor and was wondering if anyone has had that problem and would code p04db make it go in limp mode

 

AFE makes a restrictor tube for the pcv that supposedly makes the code go away when an aftermarket CAI was added. I would also consider the aftermarket BOV could have an effect as well. Is it vented to atmosphere or tied into the Intake system like OEM?

 

Atmosphere. But haven’t had issues with them before. I’ve had several blow off valves on several of my other builds and no issues.

 

Have you verified the OEM BOV tube that ties into the intake system was properly sealed off?

 

Is you K&N the oiled type?

 

I’d get rid of the aftermarket cold air intake and put the stock cold air intake on.