Gm fault code p0449

3. Cycle the evaporative vent solenoid with a scan tool. The solenoid should click. 4. Backprobe the White wire, pin 22 of the blue PCM connector. The voltage on this wire should be battery voltage with the solenoid off and close to 0 volts with the solenoid on. Potential Causes: Evaporative Vent Solenoid.

Dec 5, 2023 · The P0449 code is a common diagnostic trouble code (DTC) that is specific to Chevrolet Silverado vehicles. This code is related to the EVAP (evaporative emission control) system and indicates an issue with the vent valve/solenoid circuit. The EVAP system plays a crucial role in controlling vehicle emissions by capturing and storing fuel vapors ... In the majority of cases, a bad EVAP vent solenoid is the cause of the P0449 trouble code lighting up the check engine light on your Chevrolet Silverado (GMC Sierra). Although a bad EVAP vent solenoid is the most common cause of a P0449 trouble code, in some cases it's not. The following EVAP system faults can also cause a P0449 trouble code:The ECM (Engine Control Module) of the vehicle has detected that there is a fault in the circuit which controls the vent that releases the fuel vapor from the system. This will be followed by the service engine soon light. ... GMC Terrain P0449 OBDII Code Symptoms. The service engine soon light is often the only sign that the P0449 code has ...P0455 indicates a large leak in the evaporative emission control system. (EVAP). There are different leak size codes. For example, P0456 means your Sierra has a small EVAP leak. While the trouble code may state that there is a "large leak" in the EVAP system of your GMC Sierra, the actual leak will most likely still look relatively small.While we cover a wide range of models, including the Chevrolet Silverado 2500 HD (1999 - 2006), our guides are crafted to give you the confidence to perform repairs like addressing the P0449 code on your 2007 Silverado. Preventive Measures. Preventing future P0449 errors involves regular inspection and maintenance of the EVAP system. This includes:11 posts · Joined 2021. #5 · Mar 17, 2022. 2019 LT, got a p0449, went through the motions of the valve under the hood, light still on. Had it looked at by the dealer, dealer says harness is bad. Anyone have a part number for the evap harness? Only thing I can find harness related is the engine harness.A lot of this new vehicles have various computers and modules just about anything is control by a computer or module. I try to do my best for you guys but I ...

Dodge Ram P0449 Definition. P0449 is a universal OBDII trouble code. This means that regardless of which make or model of vehicle, the code will mean the same thing (Ram or not, as long as it was manufactured after 1996). P0449 indicates that the valve or solenoid circuit that controls the evaporation system is not functioning properly.05 GMC Sierra with5.3 V8. check engine light on and some times it flashes. rough idle just started thought maybe it was some bad gas? went to Autozone Trouble code that came up P0442, P0455,P0449,P030 … read moreCar fault codes, also known as diagnostic trouble codes (DTCs), are an essential aspect of modern vehicle technology. These codes provide valuable insights into potential issues wi...I have a trouble code of P0449, Evaporative Emission Control system Vent valve/ Solenoid Circuit so what is most likely - Answered by a verified Chevy Mechanic. We use cookies to give you the best possible experience on our website. ... Chevrolet Express 1500 code p0449 on 08 chevy express van.Check Details Cannot erase code p0449: last year i replaced the evaporative. Fix start issues code p0449 purge solenoid gm tahoe suburban escaladeGm diagnostic for code p0449 angry mechanic .This trouble code is a reference number that is given to you when you plug your Sonic 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.

Labor: 1.0. The cost to diagnose the P0449 2017 Chevrolet Silverado code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.This trouble code is a reference number that is given to you when you plug your Aveo 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.Aug 20, 2018 · A very common issue with the GMC Terrain is the P0449 code. This trouble code is a reference number that is given to you when you plug your Terrain 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. 2009 Silverado P0449 check engine light. Alright so I bought my Chevy Silverado 1500 5.3L V8 4x4 truck back in october it now currently has 88k miles and this code came on during december for a few days and went off. a couple months later it did the same thing. but last month i was driving and my indicator told me to tighten the gas cap. so I ...OBD II fault code P0455 is a generic code that is defined as "Evaporative Emission System Leak Detected (large leak), and is most commonly set when the PCM (Powertrain Control Module) detects a large leak in the evaporative emissions control system. NOTE: Note that on many applications, this code has a dual definition, in the sense that it ...

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Diagnosis and Replacement of faulty Vent Solenoid on a 2005 Chevrolet SuburbanDisclaimer:Due to factors beyond the control of CharlesAndCars, it cannot guara...The P0449 is a fairly straight forward code pointing to a problem with the EVAP Vent Solenoid. The solenoid is located under the vehicle, mounted to the side of the EVAP Canister, which is located in front of the fuel tank. For an image location view, click here: https://bit.ly/3lDSRVu.Today we look at the general method of scanning codes and specifically how to fix the 0449 Check Engine Light (CEL) an a 2008 Corvette C6 Z06.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 2014 Chevrolet Silverado Code - Evaporative Emission Vent Solenoid Valve Control Circuit.This trouble code is a reference number that is given to you when you plug your Enclave 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.n9cv. P0449 is an electrical problem. The Computer looks at the return wire from the solenoid and if the +12 volts is not as expected the code is set. This is most often a defective coil in the vent solenoid but is also can be a loss of voltage to the solenoid or the return line to the Computer is open.

OBD-II Code P0449 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 ...DTC P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit. Conditions for Running the DTC. • The ignition is ON. • The system voltage is between 6-18 volts. • DTC P0449 runs continuously once the above conditions are met. Conditions for Setting the DTC. • The control module detects that the commanded state of the driver and ...The Bank 1 dictates the side of the engine with cylinder #1. Because code P0017 deals with the "B" sensor, you are dealing with the exhaust camshaft side. Other codes deal with Bank 2, along with the "A" sensor. Reference the service manual if you need more information about the location.This trouble code is a reference number that is given to you when you plug your Outlook 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.2006 malibu 3.5 code P0449 replaced evap purge solenoid,didn't fix lite back on same code,what next? *****@******.***. Normally it is not the purge solenoid for this code but the vent solenoid mounted on the charcoal canister which is mounted behind the left rear wheel. A shop with a good scantool can run the evap test in the computer to see if ...This trouble code is a reference number that is given to you when you plug your Colorado 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.The ECM (Engine Control Module) of the vehicle has detected that there is a fault in the circuit which controls the vent that releases the fuel vapor from the system. This will be followed by the service engine soon light. ... Chevy Sonic P0449 OBDII Code Symptoms. The service engine soon light is often the only sign that the P0449 code has ...OBD-II Code P0498 is defined as a Evaporative Emission System Vent Valve Control Circuit Low. The evaporative control (EVAP) system captures any fuel vapors from the fuel tank and sends them through the vehicle's intake to be burned in the normal combustion process. The EVAP Vent Valve allows fresh air to enter the EVAP system so it is not ...Quick overview of causes and fixes P0449 OBDII error code GMC and Chevy. "Evaporative System Vent Control Circuit Malfunction."Read here for more informatio...

2000 gmc sierraSilveradosierra.com • p0449 code, 2008 gmc sierra 5.3 : vortec 5300 5.3l v8 . Check Details Check Details. Gmc envoy code p0449. Check Details. SilveradoSierra.com • P0449 Code, 2008 GMC Sierra 5.3 : Vortec 5300 5.3L V8. Check Details. I have a code P0449 Evaporative Emission System Vent Valve/Solenoid. Check Details. P0449 ...

This trouble code is a reference number that is given to you when you plug your Torrent 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit …This trouble code is a reference number that is given to you when you plug your Express 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.Too Low or low a value indicates a faulty coil inside the valve, thusly meaning replacement is necessary. This code seems to be prevalent on Dodge, Chrsyler, and Jeep products. In those cases the vent valve was bad. With GM products (specifically pickups), GM has released a new updated valve assembly. Finally, remove the valve, you may be able ...20 posts · Joined 2019. #1 · Jan 28, 2020. My wife has a 2013 Malibu LTZ 2.0 turbo (LTG). It recently started throwing a P0449 code- Canister Vent Solenoid Circuit. I went ahead and replaced the Vent solenoid on the canister attached to the gas tank. Code is still there.The P0404 diagnostic trouble code means that the Exhaust Gas Recirculation Circuit Range/Performance fault has occurred. This generic trouble code comes from the powertrain control module ( PCM) and indicates that the Exhaust Gas Recirculation (EGR) valve is not functioning correctly. Normally, this code indicates that the parameters aren't ...P0449 code 04 Chevrolet Suburban . Mazdax605 UltraDork 5/31/16 4:40 p.m. Hey guys, Had the check engine light come on in the suburban this afternoon. ... The ECU is detecting a circuit fault within the Vent Valve Solenoid's circuit. Most likely it is either a corroded connector at the vent valve or the vent valve itself has gotten stuck in one ...How to fix Code P0449 EVAP Vent Solenoid on GM vehicles, Silverado , Tahoe, Suburban, Yukon! Make sure that you use quality parts and tools!!!!I hope this vi...This trouble code is a reference number that is given to you when you plug your Aveo 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.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.

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OK, went to co-workers with a 2010 Impala LT and swapped his vent and purge valves to the 2008 to remove any doubt and still have the same issue erase codes, says 0 codes found after erasing, read again same P0449 code found. With battery cable disconnect I tried before, I can't see it being the OBD scanner at fault (it is fairly old).85 posts · Joined 2013. #1 · Aug 23, 2015. Hey guys so I have the P0449 CEL code and I already replaced the purge valve under the hood but to no avail. I still have the CEL. I assume that the next part to replace is the Evap Canester Vent Solenoid but I see that according to RockAuto there is one for crew cab and one for reg cab and then one ...How To Fix A p0449 Code? If you are a do-it-yourselfer, here is how you fix a p0449 code. What you need. Screwdriver or pliers; Chevy Silverado Manual; Gloves and a dust mask; Smoke machine; The advanced diagnostic scan code checker; I suggest the following steps: Use the scan code checker to check the EVAP trouble codes. This makes the ...P0449 Chevy Suburban. A very common issue with the Chevy Suburban is the P0449 code. This trouble code is a reference number that is given to you when you plug your Suburban 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 …How to Fix. Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins. Search for P0449 GMC Questions and Answers. Possible Symptoms. Engine Light ON (or Service Engine Soon Warning Light)Earlier this year, GM announced plans to go green by 2035 with the vehicles it produces and by 2030 with how it produces them. Now, the company has announced that it will be early ...The GMC Sierra code P0449 refers to a specific diagnostic trouble code related to the evaporative emission control system in GMC Sierra trucks. This code indicates a malfunction in the vent valve control circuit, which can affect the vehicle’s emissions controls.This trouble code is a reference number that is given to you when you plug your Sonic 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.2006 GMC Envoy: trouble code..she need to replace to fix this problem My daughters 2006 GMC Envoy keeps getting a p0449 trouble code. What part does she need to replace to fix this problem. …General Motors has developed a self-driving car called the Cruise AV that has no steering wheel or pedals. Learn more at HowStuffWorks. Advertisement Get ready for a self-driving c...The P0449 is a fairly straight forward code and a fairly common fail item on these vehicles. It's pointing to a fault in the EVAP Vent Solenoid. Carefully inspect the plastic tube of the solenoid (from solenoid to canister) looking for any cracks, holes or loose/missing connections. Inspect the electrical connector and as far up the harness as ... ….

The code P0449: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction indicates a malfunction in the Evaporative Emission Control ... Overview of P0449 trouble code. Free OBD2 scanner buyer's guide. How to fix P0449 - learn from mechanics. ... Service case 3: GMC P0449. Vehicle Information 2006 GMC Envoy XL SLE, 4.2L ...Come along and see how we diagnosed and Fixed this common vent solenoid issue on Chevy TrucksThanks for watching and Don't forget to subscribe for moreDecember 19, 2018 by Jason. A somewhat common issue with the Buick Rainier is the P0449 code. This code references a number that is given to you when you plug it into a OBD2 scanner. P0449 deals with the evaporative emissions control (EVAP) system. It often appears with, or is related other codes, such as P0420, P0446, and very often P0455.What the P0449 code means. The P0449 DTC means that the evaporative emission control system vent valve or solenoid has a malfunction. The ECU detects this fault and causes …The GMC Sierra code P0449 refers to a specific diagnostic trouble code related to the evaporative emission control system in GMC Sierra trucks. This code indicates a malfunction in the vent valve control circuit, which can affect the vehicle's emissions controls.This trouble code is a reference number that is given to you when you plug your Relay 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.2014 Chevrolet Express 6.0 I have a p0449 code this related…. Hi I'm Bart. I'll be glad to help with this. There is actually a fuse for the canister vent solenoid. Replace the solenoid, it shorted out internally. Replace the fuse. It's located in the underhood fuse box. The fuse is good.A vehicle's EVAP system is extremely complex and varies in design between all makes and models. Therefore, it is best to seek the expertise of a professional mechanic who can properly diagnose ...Aug 19, 2018 · This trouble code is a reference number that is given to you when you plug your Spark 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction. Gmc sierra 5.3 p0307 clyinder 7 misfire prognosis/ fixGmc sierra 1500 p0449 p0171 specs p0174 codes p0300 cab cars code colors trouble base regular car capacity year truck 🔴 how to fix code p0449 evap vent solenoid on gm vehicles, silveradoGmc sierra 1500 overheating fix no ac p0128 code. Gm fault code p0449, DTC P0449 is the code. DTC P0449 Evaporative Emission (EVAP) vent Solenoid Control Circuit. The vent solenoid is not working properly. The ecm driver could be defective, the wiring could be broken, or the vent solenoid just isn't working. Sep 18, 2009 • 2006 GMC Sierra 1500 2WD., diagnosing my chevy Tahoe engine codeP0449 code can be 1 of 3 things!1.Vent Valve2.Purge Valve3. Charcoal Canister Amazon link for purchase vapor canister ht..., Diagnosis and repair for the P0449 code for the GM vehicles (canister vent valve replacement). This is a pretty common fault code, but fortunately it is pre..., A very common issue with the GMC Terrain is the P0449 code. This trouble code is a reference number that is given to you when you plug your Terrain 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., Labor: 1.0. The cost to diagnose the P2119 Chevrolet code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour., Running out of ideas on a P0449 code I've got. I've changed the Vapor canister valve at the engine, and replaced the whole Evap solenoid with hoses. Seems to have power as well.., RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog., International truck fault codes let you know what’s wrong with your International-brand truck. Check out this guide to understanding International truck fault codes, and get back o..., 6 posts · Joined 2013. #14 · Jul 14, 2013. Just had to replace my EVAP solenoid/filter assy to get rid of the P0449 code. Got this part from Amazon ~$70.00. Located in front of the fuel tank and cannister above l/h frame. Easy to get to if you raise the truck or use ramps., P0449. Notes. CIRCUIT DESCRIPTION. An ignition voltage is supplied to the evaporative emission (EVAP) canister vent valve. The control module grounds the EVAP canister vent valve control circuit to close the valve by means of an internal switch called a driver., Today we look at the general method of scanning codes and specifically how to fix the 0449 Check Engine Light (CEL) an a 2008 Corvette C6 Z06., diagnosing my chevy Tahoe engine codeP0449 code can be 1 of 3 things!1.Vent Valve2.Purge Valve3. Charcoal Canister Amazon link for purchase vapor canister ht..., P0449 Customer complaints, engine light and front end noise. Vehicle had a code for a circuit failure within the vent control solenoid. I diagnose and fix th..., The P0449 is a fairly straight forward code pointing to a fault with the Vent Solenoid. There is a fuse that protects this circuit. It's in the under-hood fuse box labeled as "TCM CNSTR" (fuse #26). If this fuse is good, and the Vent Solenoid is new, make sure to carefully inspect the Vent Pipe (#3 in image below) for any cracks, holes or loose ..., To fix the automobile fault code P1174, start by checking the possible causes mentioned above. Then, visually inspect the wiring harness and connectors related to the issue. Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins. This fix is estimated to take approximately 1.0 hour., For that reason, the P0446 code will sometimes be a sign that an electrical failure has been detected with either the control circuit or the vent valve, which may result in any number of codes ..., In the majority of cases, a bad EVAP vent solenoid is the cause of the P0449 trouble code lighting up the check engine light on your Chevrolet Silverado (GMC Sierra). Although a bad EVAP vent solenoid is the most common cause of a P0449 trouble code, in some cases it's not. The following EVAP system faults can also cause a P0449 trouble code:, What Does the P0498 Code Mean? Diagnostic trouble code (DTC) P0498 stands for "Evaporative Emission System Vent Valve Control Circuit Low.". Modern EVAP systems have a vent valve that opens whenever the pressure or vacuum exceeds a calibrated value and closes when the pressure or vacuum has been relieved., Oct 27, 2022 ... Chevrolet Traverse Code P0449 Evap System Vent Valve Control Circuit Open, Diagnosis & Repair · Comments88., The following TSBs of Chevrolet are related to DTC P0449. 2003 Chevrolet Silverado Classic Emission Control TSB Details …. 2003 Chevrolet Silverado Classic Engine and Engine Cooling TSB Details …. 2003 Chevrolet Silverado Classic Fuel Tank Filler Pipe and Cap TSB Details …. 2004 Chevrolet Silverado Classic Emission Control TSB Details …., To fix the automobile fault code P1174, start by checking the possible causes mentioned above. Then, visually inspect the wiring harness and connectors related to the issue. Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins. This fix is estimated to take approximately 1.0 hour., This video shows some tips for replacing the intake tuning valve on GM 3.6L SUVs that are turning the check engine light on for code P2070 "Intake tuning val..., 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, This trouble code is a reference number that is given to you when you plug your Enclave 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: Evaporative Emission Control System Vent Valve/Solenoid Circuit …, FIXED my P0449 code on 07 Denali. Thread starter timmyjimmy5150; Start date Jan 23, 2013; ... Fired up the yukon, drove to Auto Zone, cleared the code, and no more problem. No more trouble light. Keep in mind, When I got the code 8 months ago, I tried to clear it at Auto Zone and the scanner couldn't clear it. With the new solenoid it quickly ..., 2008 suburban i have code p0449 i change evap solenoid,purge valve and pressure sensor on gas tank im still geting - GMC Suburban question ... code .P0446. ... Chevy Truck Hard To Fill Gas Tank - GM EVAP Codes P0442, P0446, P0455 or P0449 ... EVAP Purge Solenoid Removal - YouTube ... Trouble Code Conditions: DTC P0107, P0108, P0112, P0113 ..., A very common issue with the GMC Sierra is the P0449 code. This trouble code is a reference number that is given to you when you plug your Sierra 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 a universal OBDII trouble code. This means that regardless of which make or model of vehicle, the code will mean the same thing (4Runner or not, as long as it was manufactured after 1996). P0449 indicates that the valve or solenoid circuit that controls the evaporation system is not functioning properly., Code P0449 is a diagnostic trouble code (DTC) that indicates a problem with the evaporative emission control (EVAP) system vent control circuit. This article explains the causes, symptoms, and fixes for code P0449, including specific information for Chevy vehicles., Trouble Code P0451: EVAP Emission System Pressure Sensor Performance. Learn what Trouble Code P0451 means, the cause, and how to fix it. Read More . Diagnostic Code P0141: O2 Sensor Heater Circuit Malfunction. Learn what Trouble Code P0141 means, the cause, and how to fix it. Read More . Contents Hide., Diagnose and fix code P0449 Chevrolet Equinox A P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit means there’s a problem with the vent solenoid or the circuit to the solenoid. Don’t just assume that you have a bad vent solenoid., Yes, code P0455 can clear itself. This is because the emission system is designed to run self-tests when you drive at a particular steady speed over a period. However, the code may take a couple of drive cycles to clear off by itself. Meanwhile, this happens when you have properly closed the gas cap., OBD-II Code P0449 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 ...