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Old 11-24-2021, 09:52 PM   #1
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Help with check engine light?

The check engine light recently came on in my 2019 F53 with the v10. Code reader says ď Check Engine Light, Code 0446 Evap Emission Sys Vent Control CktĒ. Unfortunately I donít understand what that means :sad. I canít get to a Ford dealer for at least a month and donít want to harm the engine. It runs fine and mileage is normal. Do any of you know what that code really means?
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Old 11-24-2021, 10:18 PM   #2
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GOOGLE IT!
Found this
What causes the P0446 code?
  • Faulty, missing, or broken gas cap
  • Faulty EVAP system hose
  • A Leaking fuel tank
  • Broken or faulty charcoal canister
What are the symptoms of the P0446 code?
  • The Check Engine Light being present.
  • A fuel odor may be noticed and the fuel economy may suffer slightly.
Also found this:
P0446 FORD code possible causes

Missing Fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap
Vent control valve harness is open or shorted
Vent control valve circuit poor electrical connection
Faulty vent control valve
The Evaporative System (EVAP) canister vent control valve is located on the EVAP canister and is used to seal the canister vent.
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Old 11-24-2021, 10:49 PM   #3
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You have a failure in the evaporative emissions control system. This system helps to prevent the release of fuel vapors to the atmospere. Specifically there is an electrical circuit failure to the vent solenoid.
More detail: there is a carbon canister that stores fuel vapors until they can be drawn into the engine intake and burned. On the canister is an electrical vent solenoid which opens and closes the canister to atmosphere. There is an electrical fault in the solenoid or circuit that controls it.
You can continue to drive the coach with this fault, it will not damage the engine/ powertrain. Let me know if you would like a more detailed explanation.

I spent over 40 years in Ford service depts. prior to retiring last year. Hope the explanation helps your understanding.

Steve
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Old 11-24-2021, 11:55 PM   #4
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I've been getting a P0446 code on my 2000 Lexus RX300 toad for five years now. Replaced fuel cap with official Lexus cap twice no help. It's the canister filter assy and that's a small fortune.

I have a Bluetooth dongle that connects to my cellphone and I clear the code with that.

I've noticed that it occurs after I've filled my tank and then used about five gallons of gas or so. You can also clear it by disconnecting the engine battery.

It doesn't hurt anything.
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Old 11-26-2021, 10:08 AM   #5
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Quote:
Originally Posted by Steveo7 View Post
You have a failure in the evaporative emissions control system. This system helps to prevent the release of fuel vapors to the atmospere. Specifically there is an electrical circuit failure to the vent solenoid.
More detail: there is a carbon canister that stores fuel vapors until they can be drawn into the engine intake and burned. On the canister is an electrical vent solenoid which opens and closes the canister to atmosphere. There is an electrical fault in the solenoid or circuit that controls it.
You can continue to drive the coach with this fault, it will not damage the engine/ powertrain. Let me know if you would like a more detailed explanation.

I spent over 40 years in Ford service depts. prior to retiring last year. Hope the explanation helps your understanding.

Steve
Thanks Steve, Your description certainly helps me understand. Iíll do some digging to find out where these parts are located on my F53 and look around for any damaged wires and see how difficult it is to replace the parts. Unfortunately, my local Ford dealer seems to have staffing problems and canít get me in anytime soon.
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Old 11-26-2021, 05:44 PM   #6
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If it happened about the time you filled up check your gas cap first. The EVAP system needs to be sealed to work.
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Old 11-26-2021, 06:36 PM   #7
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Vent valve is on the frame under the drivers seat area. Look at the wiring harness. I bet you will see the problem
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