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 more commonly on older vehicles, usually from domestic manufacturers like GM.Summary. The P0442 code stands for "Evaporative Emission Control System Leak Detected (Small Leak).". Common causes of the P0442 code include a malfunctioning fuel cap, a leak or damage in the EVAP system line, charcoal canister, or fuel tank, a malfunctioning vent valve or purge valve, a faulty FTP sensor, or a failed leak detection pump.GMC Acadia Symptoms of a P0496 Code . Check Engine Light On ; Long Start Time; Rough Idle ; Often there are no issues with a P0496 Code, but the engine light will come on, and the vehicle will not pass an emission test. In some cases, some people have reported long start times and rough idle. SummaryThe GMC Sierra is a popular choice among truck enthusiasts for its performance, durability, and stylish design. One aspect that sets the Sierra apart from other trucks on the marke...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 Tahoe’s EVAP system, which prevents fuel vapor from being released into the atmosphere. A prevalent issue with the Chevy Tahoe is the P0446 code.0. Location. THA BAY. dye4metal said: i think its the vent valve in the tank. either way ill be buying a new gas cap cause of the tether. chevy said the cap wasnt bad tho. P0466 Evaporative Emission Control System Vent Control Circuit Malfunction. yea i would say most likely the vent valve, might be blocked.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 ...The check engine light came on a few weeks back. 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. 2.Sep 12, 2020 · Do you have a GMC Sierra with a P0446 code and a faulty evap canister vent solenoid valve? Watch this video to learn how to diagnose and replace the valve yourself. You will also find useful tips ...5557 posts · Joined 2008. #2 · Feb 26, 2016. Re: p0300 only when wet? sounds like you have condesation in or around the coil packs. i would clean them out really good make sure no corrosion is present on the electrodes and ketchup actually works wonders cleaning them ... dont ask just use trust me ! also when putting them back on …P0446 Definition. P0446 is a standard OBDII trouble code, applicable to any make or model of vehicle, whether it's a Malibu 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.Evap Code P0446. I have a 2001 GMC Sierra 5.3L, Extended Cab, 73,000 Original MIles, has a P0446 code, both Canister and purge valves have been supposedly replaced they look new, filler neck was replaced while the tank was out, new gas cap, has been smoked tested, no leaks reported, fill the tank with gas without issue, then clear …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 …Jan 17, 2009 · My check engine light is on and the code is P0446. Information I know. Definition: EVAP purge/vent solenoid circuit condition. Explanation: The solenoids and system wiring are monitored for opens or shorts. Probable causes: 1. Purge or vent solenoids defective.They are in order of probability. P0449 can not be generated due to any other failure. Evap leaks generate one of a few other codes. 1. P0442 small leak 2. P0446 large leak 3. P0496 evap flow during non purge event 4. I can't remember the exact code number but it relates to vent valve performance.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.When there is a large leak in the GMC Yukon’s EVAP system, it will throw the P0455 OBDII Code. P0455 indicates a large leak in the evaporative emission control system. (EVAP). There are different leak size codes. For example, P0456 means your Yukon has a small EVAP leak. While the trouble code may state that there is a “large …674. May 30, 2017. #7. P0446 indicates a blockage or restriction, not a leak or crack. The vent valve was by far the most likely cause but since that obviously didn't fix it you're looking at the hose that connects the vent valve to the charcoal canister, the canister itself or the fuel tank pressure (FTP) sensor.If you’re in the market for a new pickup truck, you may be considering the 2020 GMC Sierra 1500. The 2020 Sierra 1500 comes with some noteworthy improvements over the previous year...Pry up on the old sensor with a screwdriver or such and put some lubricant on your new senor and push back in. Plug in electric and bolt the tank back in place.Put your wheel well back in. PS run your tank almost MTY first. Saves a couple hundred from the dealer doing it and part was like 35 bucs. Sort by Oldest first. C.The P0446 trouble code is vent solenoid-related EVAP code...but it's rarely actually the vent causing the issue. Check out a quick test you can do to verify ...1999-2007 GMC Sierra (Classic) Models. 2007-2010 Chevrolet Silverado Models (Including Hybrid) 2007-2010 GMC Sierra Models (Including Hybrid) ... I have 1997 Blazer the service engine comes on and the code PO446 pluged vent for canister is this the vent on the fuel tank or the one above the spare tire or Is this something else. ...A prevalent issue with the Pontiac G6 is the P0446 code. This code corresponds to a specific number obtained when connecting your G6 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,C. cart7881. 5784 posts · Joined 2012. #2 · Oct 12, 2021. P0446 is a result of a test failure. The PCM closes the vent solenoid and opens the purge valve. It then monitors the fuel tank pressure sensor. When a calibrated vacuum has been pulled, the PCM closes the purge valve and opens the vent.P0446 Definition. P0446 is a standard OBDII trouble code, applicable to any make or model of vehicle, whether it's a S10 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.I have a 2014 silverado Work truck that has the P0446 code on, I am looking for the Vent solenoid filter location so I can clean it. Anyone know the location of it, videos I have looked at show it by the transmission but I have had no luck finding it. ... Chevy Silverado and GMC Sierra Forum. 1.4M posts 184.5K members Since 2009 A forum ...Steps to fix code P0446 & P0455. Check the Gas Cap. Inspect the condition of the gas cap. Check the seal and make sure it isn't broken or dry-rotted. Test the gas cap and make sure it's tightening securely. Check the Purge Valve. The purge valve is also a likely cause of codes P0446 and P0455.P0446 2017 GMC Sierra Code - Evaporative Emission Vent System Performance - Code Popularity: 317 Views - Repair Importance Level: 1/3 - Repair Difficulty Level: 3/3. Table of contents. Created and updated by William Orellana on Jul 21, 2022. Possible Causes; Tech Notes;Yes, P0440, P0441, and P0446 codes are all related to the evaporative emission control system in a GMC Sierra. 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 related to vent control issues. While these codes are distinct, …A prevalent issue with the Chevy Impala is the P0446 code. This code corresponds to a specific number obtained when connecting your Impala 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,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.Got a po446 code. Put on new gas cap, changed evap, even got cadillac converter checked, code wont clear. 2006 cadillac dts. ... Dream car: tie between a '71 Hemi 'Cuda and a '91 GMC Syclone. #GirlDad #SaveTheManuals. Find a Certified Shop. We've partnered with RepairPal to recommend trustworthy shops in your area. Enter your details to ...2001 GMC Sierra 4.8 Coming up with an engine code p0446 With the scan tool can turn the vent solenoid on and off. This is the third vent solenoid. It works for sure.The P0446 code indicates a air venting problem… So actually if anything, if there were in fact rusted holes in the filler neck it would let air into the system and actually help to prevent a P0446 code. Of course it would cause a leak code in a check engine system. P0446 repair advice is typically and foremost for replacing a vent solenoid ...To diagnose the P0446 GMC 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.To diagnose code P0446 in the Ford F150, follow these steps: 1. Use an OBD-II scanner: Connect an OBD-II scanner to the vehicle’s diagnostic port and read the trouble codes. If P0446 appears, further diagnosis is required. 2. Check the gas cap: Inspect the gas cap for any signs of damage or looseness.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?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.This code most often refers to a blockage in the EVAP vent system. This code is not associated with a bad gas cap or faulty EVAP Purge solenoid (on top of the intake manifold). In no particular order, here's what I did: Symptom (s): P0446 triggering Check Engine Light with hard+pending codes. Symptom (s): Slow refueling (gas pump …DTC P0446 Evaporative Emission Vent System PerformanceHow to fix P0446 EVAP Vent system performance code on a GM or Chevy truck. This is an updated bulletin...The EVAP system requires the PCM be able to detect a leak as small as 0.040 inch in the EVAP system. The PCM uses several tests to determine if the EVAP system is leaking. P0496 GMC Code - Evaporative Emission System Flow During Non-Purge.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. Some parts I’ve changed 2-3x now with no luck. Wire from ecm to the vent valve I have also verified is okay. Mechanic's Assistant: The code P0446 may indicate a ...19 posts · Joined 2009. #1 · May 24, 2010. have a 99 gmc sonoma with 4.3l v6 that has code 0446. replaced the evap vent valve, the one near the spare tire at the rear. rest code and drove 100+ miles; filled the tank and got an additional 25 miles before code came back. can anybody shed some light on this for me? thanks in advance.It was po446 code and of course they didn't know what it was for. Got home and did some searching. Seems to be real generic and it could be a few things. ... Lets just hope it powertrain, if not gm is getting this truck back. First thing was warped head, then alternator, then power steering, and eating 1.5 qts of oil every 2500 mile. This is ...It means that your GMC Canyon ‘s EVAP system has a pressure sensor that is malfunctioning in some way. P0451 is usually caused by either a bad EVAP pressure sensor, a clogged fuel tank relief valve, EVAP lines, EVAP wiring, or a bad fuel cap. There can be other causes as well. We’ll cover those directly below.My check engine light is on and the code is P0446. Information I know. Definition: EVAP purge/vent solenoid circuit condition. Explanation: The solenoids and system wiring are monitored for opens or shorts. Probable causes: 1. Purge or vent solenoids defective.Gmc yukon code p0455 p0442 symptoms. P0455 or p0442 codeP0442 gmc cadillac P0442 code gmc sierra troubleshooting and diagnosis2017 gmc terrain p0014 needs a exhaust cam phaser solenoid.. Gmc canyon p0446 code diagnosis- obdiiP118b code gmc terrain diesel P0442 leak silverado gmcFix code p0441 p0442 engine light on chevy, chevrolet, gmc, buick.In this video I have a look at a 2003 Chevrolet Suburban that came in with the SES light on with a code for the EVAP system. P0446 was the code stored in it....About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...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,The GMC code P0449 refers to a specific diagnostic trouble code related to the evaporative emission control system (EVAP) of a GMC vehicle. This code indicates that there is a malfunction in the EVAP vent solenoid circuit. The EVAP system is responsible for collecting and storing fuel vapors to prevent them from being released into the atmosphere.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.Code P0446. Hi I've got a 2000 gmc sierra 1500 5.3. The sending unit on my fuel pump has not been working for some time, so about 3 months ago I replaced it with a Delphi FG0407 which my research indicated should be the best option. I noticed after the install, that the new pump is noisier bc it made a hissing/squirting sound.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 Suburban’s EVAP system, which prevents fuel vapor from being released into the atmosphere. A prevalent issue with the Chevy Suburban is the P0446 code.This is a common issue that stumps a lot of people - the dreaded Chevy P0446 code. This code causes folks to think new charcoal canisters, vent valve solenoi...About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...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 ...P0446 2017 GMC Sierra Code - Evaporative Emission Vent System Performance - Code Popularity: 317 Views - Repair Importance Level: 1/3 - Repair Difficulty Level: 3/3. Table of contents. Created and updated by William Orellana on Jul 21, 2022. Possible Causes; Tech Notes;Gmc p0446 evap Vent valve evap solenoid 2004 chevy silverado tank gmc canister 1500 fuel gas sierra 2007 location 2005 cab remove 2006 Gmc diagnostic code p0446. P0446 Code | GMC Truck Forum. Code p0446 p0420 honda trouble p0442 silverado gmc 2006 sierra p0443 3l test gm evap 1999 mean chevrolet does 1l Gmc sierra evap p0455 p0449 repair P0446 ...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 sensor.Save up to $328 with top Norton coupon codes. Get 66% off Norton 360 + family plans from only $8.29 per month. PCWorld’s coupon section is created with close supervision and involv...- 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.P0446 2017 GMC Sierra Code - Evaporative Emission Vent System Performance - Code Popularity: 317 Views - Repair Importance Level: 1/3 - Repair Difficulty Level: 3/3.Aug 7, 2018 · 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 Silverado’s EVAP system, which prevents fuel vapor from being released into the atmosphere. A prevalent issue with the Chevy Silverado is the P0446 code.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 …P0446: Evaporative Emission Control System Vent Control Circuit. 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.1999-2007 GMC Sierra (Classic) Models. 2007-2010 Chevrolet Silverado Models (Including Hybrid) 2007-2010 GMC Sierra Models (Including Hybrid) ... I have 1997 Blazer the service engine comes on and the code PO446 pluged vent for canister is this the vent on the fuel tank or the one above the spare tire or Is this something else. ...A software program is typically written in a high-level programming language such as C or Visual Basic. This native code is then compiled into machine code that can be run on a com...The towing capacity of a GMC Acadia is 5,200 pounds if the vehicle is fully equipped with all support systems. Drivers should add passengers and cargo inside the vehicle when deter...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, orI have recently bought a 2001 gmc 1500 p/u dtc reads po446 my code book says computer output curcuit problem. I took the truck to a shop in town (recomended) they said it was probably a leak in the evap system. My book says there are different codes for leaks, should I be looking for leaks or go strait to electricalA few days ago I had my check engine light come on. Took it to O'Reilly and had the code ran. It showed P0442: evaporative emission system leak detected (small leak). I've been told having a smoke test done is the easiest way to find the leak but the local shop said it'll cost $42.50 for an hour of time (I'm cheap and would rather find it myself).Aug 13, 2018 · 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 GMC Sierra’s EVAP system, which prevents fuel vapor from being released into the atmosphere.How to problem solve a P0446 code on GMC Canyon. Evap canister, charcoal canister, gas vapor cannister, for GMC Canyon.Clogged evap emissions canister. Evap ...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 vent ...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 ...Jan 25, 2017 ... Comments432 · 2006 Chevy Silverado - Fuel Tank Difficult to Fill P0446 - Wheel Speed Sensor Confusion - P1 · 2019 - 2023 GMC Sierra P0498,P0449, ...thank you for watching!!!!!If this video was helpful to you and if you would like to place a donation, here is my Venmo and PayPal information. Or I would re...Jan 1, 2020 · A prevalent issue with the Chevy Colorado is the P0446 code. This code corresponds to a specific number obtained when connecting your Colorado to an OBDII scanner. A faulty vent control valve most commonly causes P0446. Table of Contents Definition Symptoms Causes Diagnosis How to Fix P0446...Here are a few ways to fix the code P0446. Replace the EVAP system hoses. Repair or Replace the fuel tank. Replace the charcoal canister. Use a proper or new gas cap. Replace faulty vent valves. How To Fix Check Engine Light P0446. Watch on. JamesL Davis.470 posts · Joined 2018. #2 ·Mar 10, 2020. Code criteria; P0446 indicates that there is an improper voltage drop in the EVAP Vent Valve circuit. This can be caused by either too little or too much electrical resistance.How to fix a Chevy / GMC P0446 engine Code: Evaporative Emission Control System Vent Control Circuit MalfunctionAmazon Link to Smoke Machine: https://amzn.to...732 posts · Joined 2012. #3 · Jul 21, 2014. p0171/4 is the front o2 sensor monitored a lean condition for longer than a set amount of time that the pcm couldn't correct for, meaning the engine is running lean or extra air is getting in to the exhaust. p0446 is related specifically to the evap canister solenoid, it isn't working, and is the ...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.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 minutesIn this video I have a look at a 2003 Chevrolet Suburban that came in with the SES light on with a code for the EVAP system. P0446 was the code stored in it....Feb 9, 2022 · The P0446 fault code stands for Evaporative Emission Control (EVAP) system vent control circuit malfunction. Put in simpler terms, this code indicates that there’s a problem with the vent valve, the control circuit for that valve, or a blocked vent valve in the EVAP system. What this means for the driver is that the car will most likely ...The P0446 is a fairly straight forward code pointing to a problem with the EVAP Canister Vent Valve. The valve is located under the vehicle, towards the rear, on the driver's side. For an image location view, click here: https://bit.ly/3h23cML. Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires.GMC stands for General Motors Truck Co., and SLE stands for special luxury edition. General Motors manufactures different vehicles with different features. SLE is a package of stan...The P0445 code tells us that it is an electrical problem in the EVAP purge control valve circuit, and not a leak in the EVAP system. How to diagnose the P0445 Code. Diagnosing a P0445 code can be done if you have basic knowledge of car electronics and have a multimeter at home. Here’s how a professional mechanic would diagnose the …P0446 definition: Evaporative Emission Control System Vent Control Circuit Malfunction. Issue Severity: LOW– Continued driving for a short period of time is okay. Repair Urgency: Get this code fixed withing …Toyota T-100. Toyota Factory Service Bulletin OBDII Code P0446. 2003 - 2004 Toyota Corolla. 2003 - 2005 Toyota Matrix. Toyota Factory Service Bulletin OBDII Code P0446 Corolla and Matrix. If P0446 is combined with P0440 and P0441 use this bulletin: 2000-2003 Toyota Solara. 2000-2003 Toyota Avalon.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 Monte Carlo's EVAP system, which prevents fuel vapor from being released into the atmosphere. A prevalent issue with the Chevy Monte Carlo is the P0446 code.. Other Notes About Code P0446 . P0446, in general, is a trocode p0446. Jump to Latest Follow ... Chevy Silv 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 ...Apr 28, 2019 · A prevalent issue with the GMC Sonoma is the P0446 code. This code corresponds to a specific number obtained when connecting your Sonoma 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, thank you for watching!!!!!If this video was helpful to you and Let's have a look at this 2004 Chevy Truck that was dropped off at SMA from another shop that was having trouble diagnosing the classic P0446 "EVAP Vent Perf... To diagnose the P0446 2017 GMC Sierra code, it typ...
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