P2c90 i need help !!!

areuriding said:

P2C90-CRANKCASE VENTILATION SYSTEM - HOSE "A" DISCONNECTED
This diagnostic runs when the following conditions are met:

• With the engine running.
• Engine speed above 1200 rpm.
• Engine load above 70%.

Possible causes:

CRANKCASE VENTILATION HOSE DISCONNECTED OR LEAKING
CRANKCASE PRESSURE SENSOR NOT FULLY SEATED
CRANKCASE VENTILATION HOSE
CRANKCASE PRESSURE SENSOR

Click to expand...

Sorry for the double entry here...
Hello areuriding....I have a 2020 Challenger Hellcat REWB and got the P2C90 code today w/ 5500 miles. The only mods I've done that could potential impact the code was an oil catch can and valve cover breather which the factory oil fill tube cap was on at the time the code was set. I did some checking in my Mopar Tech Authority USBs both mechanical and electrical and found that the diagnostic run conditions were different so I wanted to add some clarity for those that say the MIL came on at idle.

My manual says the diagnostics conditions are:
Engine Running
Engine at Idle

Paraphrasing the manuals:
During the diagnostic test, the PCM is monitoring for reduced pressure when the Makeup Air Solenoid Valve is closed. If it doesn't see a reduced pressure it throws the P2C90 code that Hose A is disconnected. This hose is on the clean side of the PCV system. It runs from the Makeup Air Solenoid to the valve cover (oil separator) on the left rear of the engine valve cover opposite the PCV (oil separator) located on the front end of the right side valve cover. The pressure sensor is located just downstream of the Makeup Air Solenoid on the left side of the engine compartment at the strut tower and is a 3-wire sensor.

The manuals in my opinion aren't very good for anyone who wants to verify they have confirmed a cause before they shoot the parts cannon. The Possible Causes are the same as you have listed. If no cause is found then they direct to replace the pressure sensor. I think you could probably do a little more old school testing like pulling the hose connector at the Makeup Air Solenoid and verifying a vacuumed in the hose at idle/part throttle. If not there then pull the PCV by twisting 90 ccw and pulling it out of the valve cover. The rattle shake test usually indicates it's working and not stuck closed or clogged which would prevent the sensor from seeing a reduced pressure. If you have a oil catch can making sure it's not full should be done right after checking the Makeup Air Hose. Then there is always the possibility that the solenoid was not closed and the sensor could be benched tested but both required more skill. I'm with the folks that don't want to take their car to the dealer but if you got that far it's going to need parts and it's probably under warranty. Just check the work...that the coil pack cover is on, if you have a factory race chiller that they haven't bent up the refrigerant lines or pulled the wires loose at the diverting solenoid, and check the paint around the hood, left front fender, and door for scratches and chips before you leave. Take a couple good pictures of the left side of the engine compartment before you go in.