Po446 code gmc

P0446 is triggered when the ECM has detected improper resistance in the circuitry to activate the vent control valve. Check the Ground and power wires to the vent valve. P0446 can also trigger when the EVAP tank pressure sensor shows that it failed to maintain the vacuum during the active EVAP leakdown test.

Labor: 1.0. To diagnose the P0446 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Code P0446 sometimes indicates that an electrical failure has been detected in either the vent valve itself or its control circuit. ... Do note that code P0446 appears more commonly on older vehicles, usually from domestic manufacturers like GM. Dodge hasn't listed the code for a while, and models like the Toyota Camry also haven't listed ...Greetings - Have a 1998 GMC Sonoma V6 w/ net PO446 code after performs all checks. Checked hoses - found cracked gas cap seal and replaced cap. Most all else "looks" OK. Any service bulletins w/ culpr … read morein this video I'm gonna share with you how to diagnose and fix a P0446 Trouble Code On a GMC Yukon! Evap System Testing! #evaporative #EVAP #gmcThis trouble code is a reference number that is given to you when you plug your Acadia into a OBDII scanner. P0449 deals with the evaporative emissions control system. It often appears with, or is related other codes, such as P0420, P0446, and very often P0440. P0449 is normally not an immediate threat to the drive-ability of your Acadia.The P0446 is a fairly straight forward code pointing to a fault with the EVAP Vent Solenoid Valve. This is definitely something a DIY'er can do without much difficulty at all. The Vent Solenoid is located under the vehicle, on the driver's side frame, near the fuel tank (see image below).We've run into the pesky P0446 code like so many others who've posted questions on this. I've been looking through ALLDATAdiy, but haven't had any luck. Here's the latest: 1. I've checked the vent solenoid for blockages, as well as the line between it and the charcoal canister. No blockages.I try to diagnose a P0446 evap code. And I get some new sunglasses.

A prevalent issue with the GMC Canyon is the P0446 code. This code corresponds to a specific number obtained when connecting your Canyon to an OBDII scanner. A faulty vent control valve most commonly causes P0446. Table of Contents Definition Symptoms Causes Diagnosis How to Fix P0446 Definition P0446 is a standard OBDII trouble code,P0446 comes on after second start after clearing the code at the battery Apparently the vent valve is not getting a clean ground to power the coil and close. So what does that mean? ... A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the discussion about performance, modifications ...Chevy truck hard to fill gas tank gm evap codes p0442, p0446, p0455 or. 2002 chev silverado 4.8l 4wd p0453 i'm busy working through theOwned 4d rwd Pre-owned 2008 chevrolet silverado 1500 lt 4d crew cab in richmond #Silverado chevy 4x4.when I had it scanned the code PO446 came up "Evaporative Emmission Control System Vent Control Circuit" I was told by a friend it is a typical gm problem and is usually the vent valve and when i priced this it was $275. ... GMC Canyon. The Original (Sold June 2016) 2007 4x4 Z71 3.7 I-5 Hunter Brush Guard Access Lorado Rollup Tonneau Window In ...Mar 1, 2019 · Cleared all codes it resets the IM now it shows 4 highlighted codes, EVAP,CAT,HTR,02S and had no codes I then let it warm up still no codes showed up, drove it around cleared the HTR and CAT NO visible codes on main screen but when i do more diganosis it shows U1300,p0442,p0446,p0455,p0496,p0741,p1153,p1133,p0133,p0153

Conclusion. P0446 is a diagnostic trouble code (DTC) associated with a vehicle’s evaporative emissions control system. It signifies an issue in the vent control circuit in your Chevy Trailblazer’s EVAP system, which prevents fuel vapor from being released into the atmosphere. A prevalent issue with the Chevy Trailblazer is the P0446 code.Failed or Faulty Oxygen Sensor (bank 1, sensor 1) Sticking/Plugged or Failed Fuel Injector. Low Fuel Pressure (possible plugged/dirty fuel filter!) Exhaust Leak between Engine and first Oxygen Sensor. Possible Solutions: A lot of Times, Cleaning the MAF Sensor and Finding/Fixing Vacuum Leaks fixes the Problem.Catalyst & EVAP Monitor hell. Greetings all, I'm new to this forum but not to working on cars. Here is the issue. I purchased a "slightly wrecked" Yukon XL 5.3, 4x4 w/AFM with 288,000 miles, I know I'm crazy! It was super cheap and for being a Missouri truck 0% rust! I figured worse case scenario I'll drop a 5.3 into her.When it comes to finding the perfect vehicle, it’s important to choose a dealership that not only offers a wide selection of high-quality options but also provides exceptional cust...

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The code may be triggered by other car problems, such as a failed charcoal canister, a clogged or damaged vent hose or filter, or a failing EVAP system pressure sensor. The most common causes for a P0446 code are a malfunctioning or clogged vent control valve or issues with the control circuit, such as faulty wiring.Like the P0443 code, the P0444 code (EVAP Purge Control Valve Circuit Open) and P0445 code (EVAP Purge Control Valve Circuit Shorted) also relate to the purge control valve. Examples of other diagnostic trouble codes pertaining to the EVAP system include P0440-P0449, P0452-P0453, and P0455-P0456.Mar 7, 2018 · Chevy GM truck P0446 diagnosis. shango066. 78.8K subscribers. Subscribed. 1.1K. 149K views 6 years ago. Correctly diagnosing P0446 code on Chevrolet and GM cars and trucks ...more. Correctly ...Quick overview of causes and fixes P0449 OBDII error code GMC and Chevy. "Evaporative System Vent Control Circuit Malfunction."Read here for more informatio...Quick regarding EVAP system (P0446) I have a 2008 silverado 4.8l. It is throwing a P0446 code, and after going through forums and fixes online, it seems like my best bet is to start with blowing out/replacing the evap vent valve. I have also read that someone had this same code on their avalanche and it ended up being a fuel pressure …

To diagnose the P0446 2018 GMC Sierra code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Aug 29, 2018 · 2000– 2003 GMC Yukon, Yukon XL with 4.8L, 5.3L, 6.0L, 8.1L Vortec™ V8 Engine (VINs V, P, T, Z, N, U, G — RPOs LR4, LM4, LM7, L59, LQ9, LQ4, L18) This bulletin is being revised to add updated warranty information and enhance the content. Please discard Corporate Bulletin Number 04-06-04-055 (Section 06 — Engine/Propulsion System). ConditionTech Notes. On most GMC vehicles the sensor is on top of the fuel tank. The P0452 code may set when replacing the fuel filter, AutoCodes.com user recommends disconnecting the car battery before replacing the fuel filter. User Submitted Video. ⚠ Check if your GMC have Safety Recalls.A prevalent issue with the GMC Sierra is the P0446 code. This code corresponds to a specific number obtained when connecting your Sierra to an OBDII scanner. A faulty vent control valve most commonly causes P0446. Table of Contents Definition Symptoms Causes Diagnosis How to Fix P0446 Definition P0446 is a standard OBDII trouble code,Jul 21, 2022 · GMC Factory Service Bulletin OBDII Code P0446. User Submitted Video. ⚠ Check if your GMC have Safety Recalls. Description. This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system.GMs and older Fords would set this code when the canister wouldn’t vent after the EVAP test, and in those cases, this code is far more likely to be triggered by mechanical clogging. Do note that code P0446 appears …Unable to fill gas tank P0446 P0455. I recently ran into a Cel (check engine light ) p0446 evan vent solenoid issue and a tighten gas cap message. The tighten gas cap only appeared in the morning on way to work when it runs the emission monitors. Well I checked gas cap appeard tight, but replaced with ac delco anyways as truck has 57k.My customer just bought this 2006 Chevy Silverado on an auction. It's in mint condition with only 56,000 miles. The fuel tank won't fill correctly. We also g...The code indicates that the solenoid is shorted (an open would mean a broken winding or a cut wire).If the trigger wire (the ground that cycles) is shorted to power it can also store this code. Code P0445 refers to the canister purge valve, which is typically a valve opened by a solenoid that is duty cycled by the ECM/PCM to allow fuel vapor stored in the canister to enter the intake manifold.Subscribed. 5.7K. 362K views 5 years ago #checkenginelight #FIXD #P0446. The FIXD wireless OBD2 scanner and free app for iPhone and Android …

I installed the updated evap part, a new gm fuel pump and the PO446 code was gone. It depends on where you're driving. The updated kit is intended for dirt road drivers. I primarily drive it on pavement so I use the less expensive original style. _____ 1959 M35A2 LDT465-1D SOLD ...

Gas caps are inexpensive and frequently the solution to code P0446. 3. If the gas cap didn't work, examine the EVAP system for leaks: Remove the vent tube from the EVAP Vent Control Valve by pinching it. Use an EVAP smoke machine leak check to pressurize the EVAP system and check if any hoses or seals are leaking smoke.Subject: DTC P0446 (Restricted/Blocked EVAP Vent Path) Set, Check Engine Light On (Replace Evaporative Emission (EVAP) Vent Valve Solenoid Assembly and Add/Relocate Filter Box Using Service Kit) Models: 1999-2007 Chevrolet Silverado (Classic) Models 1999-2007 GMC Sierra (Classic) Models 2007-2009 Chevrolet Silverado Models (Excluding …Specifically, P0452 code means that the pressure in the ECM is unusually low. This code is classified as an emission system malfunction. The ECM relies on the fuel tank pressure sensor to show fluctuations in the internal pressure of the tanks. The location of this pressure detector varies depending on the model of your car.To diagnose the P0446 2016 GMC Sierra code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.2003 gmc hd1500 4wd keep getting a code po446 what should be done. Submitted: 13 years ago. Category: GM. Show More. Show Less. Ask Your Own GM Question. Share this conversation. Answered in 40 minutes by: 6/23/2010.Hello all, I have a 2016 GMC Canyon alt displaying a p0451 code for evaporative emission system pressure sensor switch range performance. I made sure the gas cap was tightly closed and reset the code but it came once more. I’m thinking from what I’ve seen online, it might be the pressure sensor on top of the gas tank. Could it be …P1116 ECT Signal Unstable Or Intermittent - Read Our Article on Intermittent Diagnosis For Help With This GMC Check Engine Light Code. P1117 Engine Coolant Temp Signal Out-Of-Range Low. P1118 Engine Coolant Temp Signal Out-Of Range High. P1119 ECT Signal Out Of Rage With TFT Sensor. P1120 Throttle Position (TP) Sensor 1 Circuit.Diagnostic trouble code (DTC) P0453 stands for "Evaporative Emission System Pressure Sensor/Switch High." Code P0453 is set when the powertrain control module (PCM) detects that the sensor signal voltage from the fuel tank pressure (FTP) sensor, also known as the evaporative emission system pressure (EVAP) sensor, exceeds a specific value for a certain amount of time.

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This article will therefore deal with code P0420 as it applies specifically to GM vehicles. OBD II fault code P0420 is a generic trouble code that is defined as "Catalytic converter system, bank 1 - efficiency below threshold" and is set when the PCM (Powertrain Control Module) detects a condition in which the efficiency of the catalytic ...A prevalent issue with the Ford Escape is the P0446 code. This code corresponds to a specific number obtained when connecting your Escape to an OBDII scanner. A faulty vent control valve most commonly causes P0446. Table of Contents Definition Symptoms Causes Diagnosis How to Fix P0446 Definition P0446 is a standard OBDII trouble code,Location: Bogor, Bogor Raya, Western Java, Java, Indonesia, Southeast Asia, Asia. View on Open­Street­Map. Latitude. -6.58956° or 6° 35' 22" south. Longitude. 106.84405° or 106° 50' 39" east. Elevation. 278 metres (912 feet) Open Location Code.My 00 xterra had a code of po446. Trouble Code: P0446. EVAP Vent Control Solenoid Circuit Malfunction. Possible Causes: Vent solenoid circuit open, shorted to ground or to power (B+).Vent control solenoid is damaged or has failed..PCM has failed.TSB 00-060 (7/00) contains information related to this code.Blair J. 50 posts · Joined 2020. #2 · Feb 28, 2021 (Edited) Two of the most common and successful fixes for the P0446 code is to replace the vent valve solenoid, as you have already done, or replace a faulty fuel tank pressure sensor. For me the cause of the P0446 code was a faulty fuel tank pressure sensor. When I replaced it, finally the ...Aug 13, 2018 · A prevalent issue with the GMC Acadia is the P0446 code. This code corresponds to a specific number obtained when connecting your Acadia to an OBDII scanner. A faulty vent control valve most commonly causes P0446. Table of Contents Definition Symptoms Causes Diagnosis How to Fix P0446 Definition P0446 is a standard OBDII trouble code,Gmc canyon p0446 code diagnosis- obdii Gmc sierra 1500 p0449 p0171 specs p0174 codes p0300 cab cars code colors trouble base regular car capacity year truck 2003 gmc sierra dtc p0446. P0446 Code | GMC Truck Forum. Gmc sierra 5.3 p0307 clyinder 7 misfire prognosis/ fix P0446 evap Gmc diagnostic code p0446. P0446 codeThis video is about chevy Silverado EVAP p0446 diagnosis and fix. If your check engine light is on with a P0446 this video will run you through the diag proc...P0446 Definition. P0446 is a standard OBDII trouble code, applicable to any make or model of vehicle, whether it’s a Envoy or not. Here’s its technical definition: P0446: Evaporative Emission Control System → Vent Control Circuit → Malfunction. In layman’s terms, P0446 indicates a problem with the EVAP system vent control valve.dreaded p0446 dtc. on my 2007 silverado gmt900 lt z71, ex cab, vin code j, i've been fighting the dreaded p0446. and with winter coming and having moved to an emissions testing area, this is something that i need to solve soonish. so i FINALLY updated the software on my cen-tech 60794 which allowed me to perform onboard monitor …2003 GMC Sierra SLE 1500 5.3L ….

GM PO446 trouble code "Service engine soon" light came on. My "PocketScan Plus" reads a PO446 code. The description - Buick 2000 Park Avenue questionHow to repair a code PO446 On A 2001 Silverado P/U - Answered by a verified GM Mechanic. We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.Aug 7, 2018 · One of the most common trouble codes is the P0446 code. This trouble code references a number that is given to you when you plug your vehicle into a OBDII scanner. P0446 Indicates that there is a fault in the evaporative emission control system. It often appears with other codes, such as P0420, P0441, or P0440.Gas caps are inexpensive and frequently the solution to code P0446. 3. If the gas cap didn't work, examine the EVAP system for leaks: Remove the vent tube from the EVAP Vent Control Valve by pinching it. Use an EVAP smoke machine leak check to pressurize the EVAP system and check if any hoses or seals are leaking smoke.P0446 GMC Sierra. Uno de los códigos de problemas más comunes con el GMC Sierra es el Código P0446. Este código de avería hace referencia a un número que te dan cuando conectas tu Sierra a un escáner OBDII. P0446 Indica que hay una avería en el sistema de control de emisiones por evaporación. Suele aparecer con otros códigos, como ...P0446 code on 2010 gmc sierra 1500 will not go away. Vent valve and harness jumper, fuel tank pressure sensor, purge valve, charcoal canister, all lines, and gas cap are all new. ... I have a 2005 GMC pickup sarria 1/2 ton with a 5.3 and a code PO446 evaporative vent perforance I have changed the gas cap and the vent valveand stil get the code ...If the EVAP system detects a leak, it triggers the DTC P0446. Note: The fault code P0446 is one of the most common trouble codes with the GMC Sierra and Chevy Silverado. On the other hand, the Toyota Camry hasn’t listed the code P0446 since the 2007 model.What Does the P0442 Code Mean? The PO442 indicates that there's a small leak in the EVAP system. When the vehicle engine is turned off, the Electronic Control Unit (ECM) carries out a leak test to double-check that the evaporative emission control system is functioning correctly. In this test, the ECM seals the EVAP system. Po446 code gmc, Learn how you can improve your code quality in an instant following 3 simple rules that we cal Receive Stories from @gdenn Get free API security automated scan in minutes, hawkeyez. I have an 05 that was getting P0446. Cleaned the filter on the valve and it helped for a while. Code came back, so I got the updated part with the remote filter and installed that along with a new charcoal canister. (165000 miles on the truck). Now its throwing the code again, but only last tank was slow to fill., Aug 13, 2018 · P0446 Definition. P0446 is a standard OBDII trouble code, applicable to any make or model of vehicle, whether it’s a Envoy or not. Here’s its technical definition: P0446: Evaporative Emission Control System → Vent Control Circuit → Malfunction. In layman’s terms, P0446 indicates a problem with the EVAP system vent control valve., About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ..., Here's some more help for DTC PO446. Had this problem with 03 Silverado with the 4.8. Hope this helps some. Subject: LR4, LM4, LM7, L59, LQ9, LQ4, L18 DTC P0446 (Restricted/Blocked EVAP Vent Path) Set, Service Engine Soon (SES) Lamp Illuminated (Replace Vent Solenoid and Bracket) #04-06-04-055A - (03/20/2006), - The TSB for 1999 Toyota Corolla suggests replacing the ECM with an updated part as a repair for the diagnostic trouble code P0446. In some GM cars, a bad fuel tank pressure sensor also could cause the code P0446. - In Mazda Tribute and Mazda 6, the stuck open purge valve (solenoid) could cause the code P0446 or other EVAP codes., The National Highway Traffic Safety Administration had yet to post this recall to its online database at the time of publication. Contacts: GM recall number: N202313200. Chevrolet Customer Service ..., I have a code on a 1999 gmc jimmy reading p0446 vent control curcuit it does not run now - Answered by a verified GM Mechanic. ... i have a 2004 gmc 2500hd code po446 came on . how do i i fix the e-vap malfuction. i have already replaced the 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 …, Conclusion. P0446 is a diagnostic trouble code (DTC) associated with a vehicle’s evaporative emissions control system. It signifies an issue in the vent control circuit in your Ford Focus’s EVAP system, which prevents fuel vapor from being released into the atmosphere. A prevalent issue with the Ford Focus is the P0446 code., Help with p0446 p0496 codesSilverado p0446 gmc rather P0496 code chevroletPurge chevy avalanche 2002 code tahoe valve solenoid p0496 chevrolet vent 0l replace 2004 evaporative system 2006 control engine check. Purge flow . P0446 code 2014 chevy silverado. Check Details., P0452 is a generic OBD II code that can occur in the GMC Sierra. It means that your Sierra's EVAP system has detected low fuel tank pressure. The evaporative emissions control system (EVAP) sends fuel vapors from the fuel tank to the intake manifold to be burned off. When the pressure in the system is too low, P0452 is generated., The code is triggered when the wrong amount of fuel vapor is purged from the charcoal canister found in the EVAP system to the engine. So, what is an EVAP System?, I keep getting a P0446 code on my truck and have been reding on the net and found this true. 04-06-0055) for code P0446 on 2000-03 Cadillac, Chevrolet and GMC full size utility trucks. </P> The charcoal canister stores gasoline vapors from the tank. When certain driving conditions are met, the computer supplies power to the purge and …, A prevalent issue with the Chevy Corvette is the P0446 code. This code corresponds to a specific number obtained when connecting your Corvette to an OBDII scanner. A faulty vent control valve most commonly causes P0446. Table of Contents Definition Symptoms Causes Diagnosis How to Fix P0446 Definition P0446 is a standard OBDII trouble code,, The FIXD wireless OBD2 scanner and free app for iPhone and Android translates your check engine light into plain English so you can rest easy. In this video,..., P0446 2007 gmc yukon. Always Google any codes you get & read up. PO446-Evap System Vent Control Circuit Malfunction. If the Evap Vent Valve or it's control circuit are bad, then. you can't fill the fuel tank. Mar 04, 2013 •., P0446 Definition. P0446 is a standard OBDII trouble code, applicable to any make or model of vehicle, whether it's a Colorado or not. Here's its technical definition: P0446: Evaporative Emission Control System → Vent Control Circuit → Malfunction. In layman's terms, P0446 indicates a problem with the EVAP system vent control valve., Are P0440, P0441, and P0446 codes related in GMC Yukon? Yes, P0440, P0441, and P0446 codes are all related to the evaporative emission control system in a GMC Yukon. The P0440 code indicates a general issue with the system, while the P0441 code signals a problem with the EVAP system’s purge flow, and the P0446 code is …, GMC Sierra 1500 (New Model) 2019 2019 Sierra 1500 2020 2023 Sierra 1500 Limited (RPO J21, VIN Digit 5 = 8 / 9) 2022 2022 Sierra 1500 New (RPO J22, VIN Digit 5 = H / U) 2022 2022 ... P0446, P0455 or P0449. Cause The condition may be caused the by the normal use of these vehicles operating in severe dusty environments., A scan tool will display the commanded state of the EVAP Vent Solenoid Valve as Not Venting (On) or Venting (Off). The Diagnostic Trouble Code (DTC) will be set when the ECM detects the EVAP vent solenoid valve control circuit is open within 0.25 s. P0449 GMC Code - Evaporative Emission Vent Solenoid Valve Control Circuit., The P0446 fault code is related to the Evaporative Emission (EVAP) system in your automobile. It specifically tests for any restrictions or blockages in the EVAP vent path, which can cause excessive vacuum pressure to build up in the system. When this fault code is triggered, the Engine Control Module (ECM) commands the EVAP purge solenoid ..., The GMC Acadia and Saturn Outlook crossovers were both based on GM's front-wheel-drive, unibody Lambda platform. The Lambda vehicles -- which also included the Chevrolet Traverse a..., P0446 Code and Evap Canister full of water. I have a 2016 v6 (@ 34k miles) and I have had issue in the past with filling up especially in the winter, have to put the nozzle just right and slowly increase the nozzle flow while listening for the sound of fuel creeping up the fill tube. This week we went into artic freeze here in NH and temps were ..., Quick overview of causes and fixes P0449 OBDII error code GMC and Chevy. "Evaporative System Vent Control Circuit Malfunction."Read here for more informatio..., The P0496 code indicates that there's an incorrect amount of intake vacuum flow occurring in the car's EVAP system. Any time this vacuum is higher than what the computer determines is appropriate, the codes will be set. While this code can occur with all brands, it appears to be most common with GM vehicles., What's been done so far: 1: I scanned for codes, came up with P0446, did some looking around on the forums, and suggested he try to use compressed air to clean out the canister solenoid valve under the frame near the gas tank. 2: Instead of trying to clean it, he had a mechanic replace it. GM part number 19207762., P0446 Definition. P0446 is a standard OBDII trouble code, applicable to any make or model of vehicle, whether it’s a Colorado or not. Here’s its technical definition: P0446: Evaporative Emission Control System → Vent Control Circuit → Malfunction. In layman’s terms, P0446 indicates a problem with the EVAP system vent control valve., 1 Answer. P0446 Evaporative emission EVAP vent system performance. This code is more than likely cause by a faulty fuel tank pressure sensor, giving the wrong report it is on top of the fuel tank module , more than likely a replacement of this sensor resolves the issue of P0446. I keep getting the P0446 code on my 2005 GMC Canyon., in this video I will share with you how to diagnose and Repair the Root cause of a P0446 on a Chevy Impala, ippielb Discussion starter. 1555 posts · Joined 2009. #1 · Jul 7, 2009. Check for SES Light on P0446 EVAP Code check EVAP Valves both working check Vent Calve Found it is covered in mud and has dust intrusion also canister recommend canister and vent valve plus relocate. Got that on my recipect from the dealership from my check engine light., Trouble code P0446 typically turns up in On-Board Diagnostic testing on account of an illuminated Check Engine Malfunction Indicator Lamp. This generic OBD-II code indicates that the evaporative vent valve in the emission control system is malfunctioning. When this occurs, the EVAP system may not be capable of pressurizing and maintaining a ..., OBD-II Code P0446 is defined as a Evaporative System Vent Control Circuit Malfunction. The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e.g. the fuel tank, filler neck, and fuel cap). Under precise operating conditions—dictated by engine temperature, speed, and load—the EVAP system stores ...