Gm fault code p0449

My 2011 gmc sierra 1500 is throwing a few codes.. c0561, p0300, p0307 Vent evap solenoid chevy silverado canister tank valve fuel gas 2004 2007 location 2005 cab remove gmc 1500 sierra system Gmc sierra 1500 p0449 p0171 specs p0174 codes p0300 cab cars code colors trouble base regular car capacity year truck

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 ...Kia Spectra 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 (Spectra 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.A very common issue with the Chevy Tahoe is the P0449 code. This trouble code is a reference number that is given to you when you plug your Tahoe 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: …Effects of the P0449 code on Chevrolet Tahoe. Expert Solutions to Solve the P0449 Code in Chevy Tahoe. Method 01: Checking the Evaporative Emission Control System (EVAP) Method 02: Replacing the Fuel Tank Pressure Sensor. Method 03: Repairing the Vacuum Leaks. Method 04: Replacing the Purge Solenoid.Dec 29, 2018 ... Chevy Truck: P0449 EVAP Vent Valve Performance · Comments362.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 2015 Chevrolet Silverado Code - Evaporative Emission Vent Solenoid Valve Control Circuit.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. ... GM Genuine Parts 213-3866 | Oxygen Sensor. Special Price $46.68 Regular ...

P0030 Chevrolet Code - HO2S Heater Control Circuit Bank 1 Sensor 1 - Code Popularity: 81,496 Views - Repair Importance Level: 2/3 - Repair Difficulty Level: 2/3. Table of contents. Created and updated by William Orellana on Mar 23, 2024. ... The Diagnostic Trouble Code (DTC) ...This trouble code is a reference number that is given to you when you plug your G8 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 19, 2018 · This trouble code is a reference number that is given to you when you plug your Cobalt 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. This trouble code is a reference number that is given to you when you plug your Vue 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.P0449 Buick Encore. A very common issue with the Buick Encore is the P0449 code. This trouble code is a reference number that is given to you when you plug your Encore 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 …EVAP VENT Code P0449 Chevy Impala 2006-2012Items Needed: ACDelco GM Original Equipment Vapor Canister Vent Solenoid: https://amzn.to/3JO3ErQ(Optional) Wells ...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 Silverado P0449 OBDII Code Symptoms. The service engine soon light is often the only sign that the P0449 code has ...

Check your keyboard. There is no P0049 code. P0449: 1) check gas cap. 2) P0449 relates to the canister vent solenoid. At $23 bucks, may just as well replace than pay a shop you don't trust. May or may not cause the code to clear. Parts swapping and hoping for the best is not always the best way to fix your car.Code Fault Location Probable Cause; P0496: Evaporative emission (EVAP) ... DTC P0449 - EVAP Emission Control System Vent Valve/Solenoid Circuit ... Hello. I have a 2013 Chevrolet Impala LS with a little over 96k miles. I have codes P0420, P0442 and P0496. Immediately I'm being told to change the catalytic converter.My Check Engine Light came on in my 2005 Chevy Avalanche Z71. Used a code reader to find P0449 code. Did some research and found out the purge valve for the ...My Check Engine Light came on in my 2005 Chevy Avalanche Z71. Used a code reader to find P0449 code. Did some research and found out the purge valve for the ... 2006 Chevy Impala with a P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit trouble code. In this video I will show you how to test and repair t... P0449 indicates that the valve or solenoid circuit that controls the evaporation system is not functioning properly. The EVAP system cycles fuel vapor from …

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There are many things that can cause the P0442 trouble code on the Chevrolet Silverado. The most common problem is far and away the first one listed below. Vapor Canister Purge Valve- The most common culprit with the P0442 trouble code and the Chevy Silverado is going to be the vapor canister purge valve. When it goes bad, it typically causes ...Your OBD-II Trouble Codes Repair Site. Home; ... OBD Codes Forum. OBD Codes Help. GM: Chevrolet, GMC, Buick, Cadillac. 2001 GMC code P0449. Also including Oldsmobile, Geo, Hummer, and Saturn (North American brands) ... : Tue Feb 06, 2018 5:17 pm Vehicle: 2001 gmc jimmy. 2001 GMC code P0449. Post by perryme1 » Tue Feb 06, 2018 5:23 pm. My 2001 ...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. P0449 is normally not an immediate threat to the drive-ability of your Blazer.Feb 3, 2018 · 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.

Dec 27, 2013 · This is the quick and easy way to clear the P0449 and p0455 codes on a Chevy Silverado. Process is similar for all Silverados. Link to AC Delco Solenoid kit... The 2007 Chevrolet Silverado has 5 problems reported for engine light code p0449. ... Code P0449 Evap Solenoid Vent Valve Replacement and throttle body cleaned for the second time in the life of ...The codes I,m getting are p0174 system to lean bank 2, p0452 evap system pressure sensor switch low, and p0449 evap system vent valve solenoid circuit. Are all these codes relate... Need more help with a p0449 code? If you still need help regarding the P0449 trouble code, please post your question in our FREE car repair forums.Gmc sierra p0455 code 2007 Gmc sierra p0455 2007 1500 engine light fuel gm diagnosis pu check solenoid vent tank does Gmc sierra 1500 p0449 p0171 specs p0174 codes p0300 cab cars code colors trouble base regular car capacity year truck. 2007 GMC Sierra 5.3L - P0455 Evap System Gross Leak (smoke test) - YouTubeThis trouble code is a reference number that is given to you when you plug your Envoy 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.I'll show how to replace the defective Vapor Canister Vent Solenoid, which is causing the engine light on my dash to come on. The part number used for my Sil...The following codes just popped up for me on my 2016 Cruze Premiere 1.4L Turbo: P0449 - Evaporative System Vent Valve/Solenoid Circuit. P0498 - Evaporative System Vent Valve Control Circuit Low. I am wondering if anyone has the schematic for the Evaporative Emission System to aid me in tracing out the wiring and locations of solenoids.P0449 Failure Symptoms. Engine code P0449, P0440, P0441, P0446; Poor idling; Out of spec air-to-fuel ratios; Difficulty starting the engine, in some cases; If you have a small leak, you might not notice any symptoms. While the issue can cause some performance issues from AFR’s, it is usually not serious enough to cause major engine damage.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.

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.

This trouble code is a reference number that is given to you when you plug your Cobalt 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.There are many things that can cause the P0442 trouble code on the Chevrolet Silverado. The most common problem is far and away the first one listed below. Vapor Canister Purge Valve- The most common culprit with the P0442 trouble code and the Chevy Silverado is going to be the vapor canister purge valve. When it goes bad, it typically causes ...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 Yukon P0449 OBDII Code Symptoms. The service engine soon light is often the only sign that the P0449 code has …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.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.The P0448 is defined as "evaporative emission vent control short circuit.". This code indicates that the vent valve connecting the fuel tank to the charcoal canister has shorted. The P0448 code is caused by evaporative emission control (EVAP) wiring, leaks in EVAP system components, or a faulty vent valve. The issues causing this code can ...Fixing a P0449 trouble code on a Chevy Impala.Vent soleniod with pigtail wiring: https://amzn.to/3C31wYtAmazon Links to my commonly used tools:My test light:...OBD II fault code P0442 is a generic code that is defined as, "Evaporative Emission System Leak Detected (Small Leak)", and is set when the PCM (Powertrain Control Module) detects a small leak in the EVAP (Evaporative Emission System). Note that for the purposes of leak detection in the EVAP system, leaks are categorized into small, large ...

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When I recorded this there were no videos to fix the P0449 code for 2007 Chevy HHR's so I put this up in case it can help anyone.The meaning of fault code P0030. DTC P0030 indicates that the heater control circuit of oxygen sensor 1 on the first cylinder bank is malfunctioning. This heated device is located upstream of the car's cat converterand used to monitor the oxygen content in the exhaust. The engine control module (ECM) uses this information to achieve the ideal ...The code P0449: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction indicates a malfunction in the Evaporative Emission Control System’s Vent Valve/Solenoid Circuit. This fault is most likely caused by issues with the vent valve/solenoid itself or related electrical components. P0449 quick overviewHyundai Elantra 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 (Elantra 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.GM Mechanic: Daryl. This code is usually caused by Evaporative Vent Solenoid, it is part of the emissions system and will likely need to be replaced. Pic below. Daryl. Category: GM. Satisfied Customers: 12,585. Experience: 28 years experience, Master Mechanic. Verified.I agree, GM trucks are known for this code and the replacement of the solenoid cures the problem in 99.9% of the. I had two Tahoes that had this code and the first time I replaced the fuel cap with no luck, then I checked all the hoses and connections with no luck.DTC P0443 or P0449 - JustAnswer Subject: Engineering Information - Check Engine Light On and/or … DTC P0449 - JustAnswer Gm Dtc Code P0449 Welcome to legacy.ldi.upenn.edu, your go-to destination for a vast collection of Gm Dtc Code P0449 PDF eBooks. We are passionate about making the world of literature accessible to everyone, and our platformEngine-Codes - Chevrolet - P0498 Chevrolet. P0498 Chevrolet Code - Evaporative Emission System Vent Valve Control Circuit Low. - Code Popularity: 5,125 Views. - Repair Importance Level: 1/3. - Repair Difficulty Level: 3/3. Table of contents. Created and updated by William Orellana on Jun 27, 2022. Possible Causes.Hyundai Elantra 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 (Elantra 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.Here are the symptoms of fault code p0499. The symptoms of the automobile fault code P0499 include: 1. Check Engine Light (CEL) illuminated 2. Decreased engine performance 3. Engine overheating 4. Poor fuel efficiency 5. Unusual noise coming from the engine 6. Smell of burning rubber or coolant 7. Engine stalling or misfiring 8.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.The My GM Rewards Card offers high earning potential, but it likely only makes sense if you want to redeem your points toward GM-related purchases. We may receive compensation from... ….

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.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 ...These can also contribute to the P0449 code if they're leaking. Clear the Code: After making the necessary repairs, use the OBD-II scanner to clear the P0449 code from your Impala's computer. This will reset the system and allow you to …A somewhat common issue with the Chevy Uplander 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.Tahoe & Suburban - Help with p0449 & p0455 codes - I have a 08 Tahoe LT. Yesterday driving My wifes Tahoe and while driving noticed that a message came up on info display saying to tighten fuel cap we were on the highway and before we pulled over to check the fuel cap the check eng light came on. pulled over checked...this video will show you how to fix p0449 emissions dtc on gm vechicles, like tahoe, suburban, yukon, avalanche, silverado, escalade, express.disclaimer:warn...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 ...Install a Zip Tie Fir Tree Clip GM PN 84389052, 28 millimeters below the branch break out from above as shown below. 5810432. Insert the Zip Tie style Fir Tree Clip into the location shown below in the ECM Mounting Bracket. Zip Tie Fir Tree Clip installed securing the harness as show below.Conclusion. If your Chevy Colorado has the P0442 OBD II code, you should first check the fuel cap. If it's missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Chevy Colorado is the P0442 trouble code. This code appears when connecting the ...2006 Chevy Silverado with 5.3L. The check engine light comes on and the code pulled is P0449, what is the fix. This is actually a fairly common fail item on these vehicles. The most common fail item is the Evaporative Emission (EVAP) vent Solenoid. Inspect the wire harness for any broken or loose wires. Gm fault code p0449, Jun 26, 2020 · 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... , A friend who is a Cadillac Technician, advised Me to open the hood, open the large fuse and relay box, and locate a twenty amp (yellow) fuse C2, if memory serves. Pull that fuse, switch the ignition to on, then off, then replace that fuse. This action clears the memory of any codes in the PCM, according to My friend., Apr 7, 2018 ... If you have a 2007 or 2008 Chevy Uplander with the 3.9L engine and are experiencing a code P0449 watch this video for helpful information ..., Hey folks, I've got the infamous P0449, so I've done the normal "throw parts at it" solution with no success. To the best of my understanding, P0449 is an electrical malfunction, typically due to a fried solenoid. Here's what I got so far: 1 vent solenoid, tested working (Benchtop power supply closes it @ ~11v. Draws roughly 0.5 amps), PO449 evap vent valve solenoid. Hey! great forum, just join about a week ago. Had a cel (check engine light) on my 2008 Silverado 1500 5.3l and had it checked out and turned out to be the evap vent valve solenoid. After gathering some info on the forum I was able to fix the problem for less than $30 vs the dealers $150 or more., 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)., The P0449 code is an OBD-II diagnostic trouble code that specifically relates to the evaporative emission control system (EVAP) in GMC vehicles. ... Symptoms and signs of the P0449 code in GMC vehicles. When the P0449 code appears in a GMC vehicle, certain symptoms and signs may be noticeable. These can include the illumination of the check ..., Chevy Trax 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 (Trax 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., DTC P0449 DTC DESCRIPTOR DTC P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit DIAGNOSTIC FAULT INFORMATION IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Diagnostic Trouble Code Tests and Associated Procedures CIRCUIT/SYSTEM DESCRIPTION, 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., 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 ..., Labor: 1.0. To diagnose the P0449 2006 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 …, EVAP VENT Code P0449 Chevy Impala 2006-2012Items Needed: ACDelco GM Original Equipment Vapor Canister Vent Solenoid: https://amzn.to/3JO3ErQ(Optional) Wells ..., The code P0449 has to be trouble shooted like I posted for you. You can do some of it with a multimeter yourself. ... On the second visit, the GM dealer told me if it happened again it would be a real pain to diagnose it, something about having to take stuff apart. Additionally, they said it wasn't covered under the hybrid warranty, even though ..., Codes P0449 and P0446? DAN FRANK AMARAL MEMBER; 2003 GMC YUKON; 6.0L; V8; 4WD; AUTOMATIC; 300,000 MILES; Engine idling rough both po 449 and po 446 code are coming up on the diagnostic check and when I open the gas tank there's a lot of pressure that comes off of it. Just trying to figure out what needs to be replaced. ... 2003 Gmc Yukon P0446 ..., P0499 Check Engine. My brothers trucks check engine light came on today and we went to get it checked and they said the code was P0499. I found this "The P0449 is actually a "known problem" and GM has issued a new, updated EVAP Vent Valve Solenoid and service "kit". You will need to obtain these new parts from the Dealer., Aug 19, 2018 · This trouble code is a reference number that is given to you when you plug your Corvette 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. , Hyundai Santa Fe 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 (Santa Fe 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., Tahoe & Suburban - Help with p0449 & p0455 codes - I have a 08 Tahoe LT. Yesterday driving My wifes Tahoe and while driving noticed that a message came up on info display saying to tighten fuel cap we were on the highway and before we pulled over to check the fuel cap the check eng light came on. pulled over checked..., For the longest time i was unable to find a real fix video for p0449 for the 06 Chevy Trailblazer. Well after months of searching and tooling around on googl..., First of all, you should check the gas cap and gas valve. These two components are linked, and are important to the P0449 code. Changing the gas cap may resolve the issue. If it does not, you should replace the entire system. If you have a new gas cap, then you can try tapping the vent solenoid to eliminate the leak., 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., Engine-Codes.com, 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. , Sep 15, 2023 · 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. , DTC P0455 is frequently caused by the Canister Vent Solenoid stuck in the open position. When the ECM does a test of the EVAP System, it closes the Vent Solenoid and opens the Purge Solenoid. It then measures the vacuum pulled. If the Vent Solenoid is stuck open, the ECM will sense lack of vacuum and set P0455., This is the quick and easy way to clear the P0449 and p0455 codes on a Chevy Silverado. Process is similar for all Silverados. Link to AC Delco Solenoid kit..., This is the quick and easy way to clear the P0449 and p0455 codes on a Chevy Silverado. Process is similar for all Silverados. Link to AC Delco Solenoid kit..., OBD2-OBDII Engine Light Trouble Codes Definitions Description Repair ..., The p0449 code in a chevy silverado indicates an issue with the evaporative emission control system. Addressing this issue promptly can prevent further damage to the vehicle., 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., 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 Chevrolet Code - Evaporative Emission Vent Solenoid Valve Control Circuit., What Steps Can Resolve a P0449 Code in a Chevy Silverado 2009? Solutions may include inspecting and replacing the evaporative emission vent valve solenoid, checking for vacuum leaks, and clearing the code using an OBD-II scanner. Is the P0449 Code Common in Chevy Impala Models as Well?