Causes and Fixes P0446 Code: Evaporative Emission Control System Vent Control Circuit Malfunction

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Күн бұрын

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@HVAC_Mechanic 3 ай бұрын

Update: I made a full video on all the EVAP components and how to test them; here is a link. kzbin.info/www/bejne/eWbWZIWuaNydepI

@krissymiller5414 3 ай бұрын

Where exactly is the fuel pressure sensor on a 2005 Chevrolet Cobalt? How can my mechanic friend replace it?

@DenicholasBender-Paige 3 ай бұрын

Would this make the car not start?

@oxygen454 Ай бұрын

My P0446 is signalling excessive pressure. If I open the gas lid, the pressure sensor still shows -11.45mmhg. It doesn’t move much from -11. When I run the car, it still always stays at -11… bad fuel tank pressure sensor maybe? Chevy HHR AllData is saying it should be at 0 with the gas lid off.

@mikes.1882 10 ай бұрын

Does this code clear its self upon parts placement

@Kiddro22 10 ай бұрын

After so many cycles(start up) it usually does. Or within the first 100miles driven.

@dgeezy9 9 ай бұрын

So is that the reason why when I drive for a couple of minutes my car slows down and stop like it's on break.. and you're right about the gas when I'm filling up my tank is keep on cutting off

@jx5189 2 ай бұрын

I am getting random p0446 I was told that it appears to be a short because the computer won't let him run the vent test, and it is causing it not to vent when it is idling which is causing it not to pass the cars diagnostic check but when I am moving it vents. I just spent a lot of money on other repairs and asked the mechanic if it would cause performance issues or hurt my mileage, he said no. Is p0446 just environmental?

@kenweller2032 2 ай бұрын

It's environmental. I was in Massachusetts and my 2002 Hyundai passed inspection with the code because of the car's age. Moved to New York and it's a problem because it's less than 25 years old. The mechanic thinks it might be the ECM, but no guarantees. If your car passes inspection in your state, you really don't need to worry about it, but you should occasionally scan and reset just to keep an eye out for other codes.

@jx5189 2 ай бұрын

@@kenweller2032 Yeah, I got a cheap $20 reader with clear codes option. I live in a state once you buy the car you have an inspection and your done you never have to worry about it again. I didn't want to leave the light on because I would never know if new codes pop up. Thanks for the reply.

@plztrustmeonce 2 ай бұрын

Ò@@kenweller2032

@jasonskriloff3985 9 ай бұрын

I'm getting a P0441, P0446, P0455 & P4218 on a 2004 Toyota Rav4 and I'm at a loss. I've changed the purge flow sensor, charcoal canister w/ pressure sensor and the majority of the evap hoses. I'm not good with electrical tests so have not done any electrical tests so maybe that's the next step I need to take? The weird thing is that it behaves fine but after a couple of months of driving it will randomly through a cylinder misfire code on any random cylinder and take out the coil pack with it.

@Earl-vb8sj 9 ай бұрын

Jason, Toyotas EVAP problems are common. If I were you I'd spend $70 on a smoke machine and some baby oil to help finding a bad vacuum line easier. If you don't mind smoke, a cigar works okay too. If no smoke is present, ensure all vacuum lines are connected correctly. As far as testing electrical, get a 9v battery and some alligator clip test leads. Green/white is ground, red/white is hot. The switches will make a small clicking noise, and save you money. Apologies it took me so long to get to ya. First three codes are for EVAP, but 421 is for your cat. Research can only do so much on trouble codes, each vehicle is unique. Gotta open the hood to solve the problem. Good luck Jason!

@bbhoustontx 6 ай бұрын

very good and informative.

@javiermoreno7746 9 ай бұрын

I have a 2009 F150 v8 4.6 stx with code number P0446 engine light on, this vehicle has a capless fuel fill inlet system, can this also be a problem? Thanks.

@HVAC_Mechanic 9 ай бұрын

Yes, the cap less easy fuel inlet can also leak and cause an issue. Often, they can be cleaned up and made to seal again.

@javiermoreno7746 9 ай бұрын

@@HVAC_Mechanic how do l know is not working properly and how can l clean it. Thank you

@JeshuaNunez7 7 ай бұрын

@@javiermoreno7746having the same problem on the same truck too thought it was the cap did you find a fix?

@javiermoreno7746 7 ай бұрын

@@JeshuaNunez7 on my vehicle 2009 f 150 the problem was the evap valve on the charcoal canister right under the driver's door l didn't have to replace the evap valve the problem was a broken wire to the evap valve, l fixed it and is fine now Hope it helps