Gm fault code p0449

P0449 and the other one which relates. onw points to the purge valve up front by the throttle body- which is the one that usually goes. then theres the 2nd one. up by the gas tank.... which is replaced less frequently. The only thing I can tell you is drive the car until your close to running on fumes. No need to battle with all the gas weight ...

Gm fault code p0449. 11 posts · Joined 2023. #1 · Jul 26, 2023. I had a SES light stay on and scanned it and got the dreaded P0449 Evap code. I did a little home work and decided to change the vent valve solenoid. I searched around and found one at a reasonable price on E Bay. It also came with the needed harness adapter.

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.

Code p0449 diagnostic gm Gm diagnostic for code p0449 angry mechanic Vent evap circuit solenoid control p0449 gm (EVAP) Vent Solenoid Control Circuit P0449 repair - GM - YouTube Fix start issues code p0449 purge …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.P0449 Code. The diagnostic trouble code P0449 refers to the Evaporative System Vent Control Circuit Malfunction. This code is set when the vehicle's primary computer, known as the powertrain control module (PCM), detects an issue involving the Evaporative Emission Control (EVAP) System. ... GMC, and Chevrolet. P0449 Code Causes. If there is ...The P0445 code indicates that the engine control module recognized a short circuit to the purge control valve. The Purge Control Valve is also called the EVAP valve, and it regulates the fuel vapors between the engine and the fuel tank. The purge control valve is often just a solenoid with two wires, 12v+ and ground.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...Aug 19, 2018 · This trouble code is a reference number that is given to you when you plug your Traverse 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 2007 GMC YUKON Possible Causes. Vacuum leaks, damaged hoses or improper routing,EVAP system,Check fuel cap, canister, valves or components,Faulty purge or vent solenoids,Check connector and wiring,Fuel saturated vapor canister,Failed EVAP vent solenoid.

The P0449 is a fairly straight forward code pointing to a fault with the EVAP Vent Solenoid Valve. This is actually a "known problem" and GM has issued a Technical Service Bulletin that states the most common problem is moisture or dust/debris getting into the Solenoid due to it's current design. GM has redesigned the Solenoid to correct the ...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 Malfunction.Thanks, ive watched that video. I think there my be an electrical problem, maybe a bad ground or somethingHow to fix the p1135 code. You have now determined that p1135 code is as a result of a fault in the air-fuel ratio bank 1. Sensor1. Two options are now at your disposal. You can choose to replace the whole sensor, or you can decide to repair the air-fuel ration bank 1. sensor 1.Aug 20, 2018 · A very common issue with the GMC Yukon is the P0449 code. This trouble code is a reference number that is given to you when you plug your Yukon 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. Symptoms of Trouble Code P0463. Because the issue is an electrical one, your gauges will be the system most likely affected. In addition to sending trouble code P0463 and illuminated your malfunction indicator lamp, a high input will likely cause your fuel level gauge to either fluctuate or remain at full or empty.

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST. 1 (855) 347-2779 · [email protected]. Read FAQ. GET A QUOTE. P0448 code appears when the PCM detects that the circuit for the evaporative emission control system's vent has shorted or valve is stuck.GM Sierra: 2008 GMC Sierra-66k miles on 4.8L-P0449 code, are 2008 GMC Sierra-66k miles on 4.8L-P0449 code, are their any Service Bulletins or recalls concerning this P code ?? … read moreAug 20, 2018 · A very common issue with the GMC Yukon is the P0449 code. This trouble code is a reference number that is given to you when you plug your Yukon 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. This trouble code is a reference number that is given to you when you plug your Grand Am 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.

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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.Chevrolet. Impala. Trouble Codes. P Codes (Powertrain) P0400 - P0499. P0449. SPONSORED LINKS. Code P0449. ILIKERAIN MEMBER; 2008 CHEVROLET IMPALA; 3.9L; V6; 2WD; AUTOMATIC; 100,000 MILES; Code P0449 came on. I was told to replace the solenoid vent canister. ... Diagnostic fault codes never say to replace parts or that one is bad. They only ...Aug 19, 2018 · 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. 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.Action Taken When the DTC Sets. • DTC P0449 is a Type B DTC. • The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. • The control module records the operating conditions at the time the diagnostic fails.

A somewhat common issue with the GMC Sonoma 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. P0449 is normally not an immediate ...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.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 Cruze P0449 OBDII Code Symptoms. The service engine soon light is often the only sign that the P0449 code has ...2004-2012 Chevrolet Colorado Forum / GMC Canyon. Engines/Performance/Tech Questions. I4/I5 Engine & Drivetrain. Trouble Code: P0449. 16719 Views 24 Replies 19 Participants Last post by 1BADI5, Mar 21, 2016. Papercut Discussion Starter · Jan 23, 2009. Add to quote; Share Only show this user ...In this video we have a look at a 2002 Chevrolet 1500 5.3 4x4 that came in with codes, P0440, P0442, P0449, P0453 indicating a problem in the EVAP System. Qu...Fujitsu air conditioners are known for their reliability and performance. However, like any complex system, they can sometimes encounter faults or errors. One common issue that use...SOURCE: Fault codes P0449 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit P0481 - Cooling Fan Relay 2 Control Circuit It is not uncommon for the canister vent solenoid to go out.More then likely this is the correction for this issue.The second problem could be addressed by verifying that the second fan is not coming on and whether or not the fan is receiving any power.Turning the a ...P1116 ECT Signal Unstable Or Intermittent - Read Our Article on Intermittent Diagnosis For Help With These GM Trouble Codes. 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.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.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.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 Acadia P0449 OBDII Code Symptoms. The service engine soon light is often the only sign that the P0449 code has …Nearly 50,000 walked off the job in the biggest action by UAW workers in more than decade. The union is seeking higher pay and wants GM to keep more US plants open. Nearly 50,000 U...

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.

OBD-II Check Engine Light Trouble Codes for the GM/GMC Duramax below: P0100 Mass or Volume Air Flow Circuit Malfunction . P0101 Mass or Volume Air Flow Circuit ... Dtc Code P0449 gm-dtc-code-p0449 2 Downloaded from legacy.ldi.upenn.edu on 2019-08-13 by guest conscientious reader whoOur service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST. 1 (855) 347-2779 · [email protected]. Read FAQ. GET A QUOTE. P0448 code appears when the PCM detects that the circuit for the evaporative emission control system's vent has shorted or valve is stuck.The P0440 code is a common trouble code that many Chevy Silverado owners may encounter. It indicates that there is an issue with the truck's Evaporative Emission Control (EVAP) system. Specifically, the EVAP system is malfunctioning. A variety of causes can trigger the P0440 code, with the most common one being a loose or damaged fuel tank ...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 ...A plugged evaporative canister. If any of the above conditions are present, DTC P0449 sets. The PCM checks for conditions that cause the EVAP system to purge continuously by commanding the EVAP vent solenoid ON and the EVAP purge solenoid OFF, EVAP vent solenoid CLOSED, EVAP purge PWM 0 percent .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.A very common issue with the GMC Canyon is the P0449 code. This trouble code is a reference number that is given to you when you plug your Canyon 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 ...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?Anyone happen to know the part number (or where to find it) to replace a Evaporative Emission Control System Vent Valve (trouble code p0449 appeared 2-3 times)? C6 2007 Z06 Anyone replace one on a z06 ? - I see on the general corvette sites it is by the passenger tank underneath passenger side and looks pretty easy to replace.

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Defective vent valves, fuel tank filler necks, EVAP hoses, carbon canisters, gaskets, and fuel tanks are all potential causes of code P0449. Since a code P0449 relates to a leak in the evaporation system, anywhere that fumes could be escaping is a potential cause. Missing fuel cap. Defective evaporative vent valve. Damaged fuel cap.The fault code P0748 indicates that the Engine Control Module (ECM) has detected an open or shorted condition on the solenoid circuit. This means that there is a problem with the solenoid that controls the transmission fluid pressure. An open circuit means that there is a break in the electrical connection, while a shorted circuit means that ...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 ...Push in the retainer and remove the existing canister vent valve from the fuel tank clip or mounting bracket. Discard the old valve. 5. Cut back the existing canister pipe approximately 51 mm (2 in) to remove the quick connect end. 6. Install the new canister vent valve to the fuel tank clip or mounting bracket.My 2006 Chevy Colorado had a check engine light for code P0449 and in todays video I show how to fix it. Be sure to use the link below to buy a new and save ...Gmc Check Engine Code P0449 Author: docker.sketchleague.com-2020-11-17T00:00:00+00:01 Subject: Gmc Check Engine Code P0449 Keywords: gmc, check, engine, code, p0449 Created Date: 11/17/2020 1:53:24 AM P0449 GMC Evaporative Emission Vent Valve Solenoid ... This will be followed by the service engine soon light. GMC Acadia P0449 OBDII Code ...Quick, easy, and cheap fix for check engine light code P0449To 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. ….

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 often P0440.Trouble codes p0017, p0300, p0449. when coming to a stop truck misfires and wants to stall and sometimes does. I've - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website.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 Check Engine Light to be illuminated on the dashboard. What causes the P0449 code? Short or open in the wiring harness.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. 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.October 19, 2023 by Jason. P0455 in the Chevy Silverado is a trouble code that indicates your truck has a LARGE evaporative emissions leak. This code indicates that there is a large leak in the evaporative emission control system and can cause issues such as decreased fuel efficiency, rough idling, and increased emissions. In depth diagnosis and inexpensive repair of common P0449 engine code on these popular Chevy and GMC light trucks. Leaving the circuit energized for 2 minutes allows the coil to warm up. When warm the coil may open (amps drop to 0) or short (goes above 0.75 amp ). 7.Momentarily probe the solenoid control circuit to ground. Listen for an audible click when the solenoid operates. Gm fault code p0449, 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 2007 GMC YUKON Possible Causes. Vacuum leaks, damaged hoses or improper routing,EVAP system,Check fuel cap, canister, valves or components,Faulty purge or vent solenoids,Check connector and wiring,Fuel saturated vapor canister,Failed EVAP vent solenoid., 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 Colorado P0449 OBDII Code Symptoms. The service engine soon light is often the only sign that the P0449 code has ..., 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., Apr 10, 2018 ... Comments1 ; GMC / CHEVY Truck - DTC P0449 EVAP Vent Solenoid Not Working, Diagnosis & Repair - No Parts Required. KIT'S Auto and Truck Repair ..., Aug 19, 2018 · This trouble code is a reference number that is given to you when you plug your Trailblazer 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 P0449 code signifies a problem with the EVAP system's vent valve solenoid circuit. This component is responsible for controlling the flow of fuel vapors from the charcoal canister to the engine, where they can be burned off. A malfunction in this solenoid can lead to increased emissions, reduced fuel efficiency, and potentially, a ..., 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., Gorecki. 245 posts · Joined 2011. #2 · Oct 26, 2011. P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction. This is commonly caused by something as simple as not having your gas cap on completely. If this is the case and your gas cap is seating properly, the code should go away by itself or worse case send a code ..., 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 ..., EVAP VENT Code P0449 Chevy Impala 2006-2012Items Needed: ACDelco GM Original Equipment Vapor Canister Vent Solenoid: https://amzn.to/3JO3ErQ(Optional) Wells ..., This trouble code is a reference number that is given to you when you plug your Silverado 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 Silverado., 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..., In depth diagnosis and inexpensive repair of common P0449 engine code on these popular Chevy and GMC light trucks., Meet the Experts. I have codes p0449 & p0498 come up on 2019 z71 1500 5.3l. Evap vent solo pod control circuit & evap vent solinoid low - Answered by a verified Chevy Mechanic., This diagnostic trouble code (DTC) is a generic powertrain code. ... Other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0444 - P0445 - P0446 - P0447 - P0448 - P0449 - P0453 - P0455 - P0456. P0452 DTC Video. Here is a video produced by ScannerDanner on YouTube as it pertains to a P0452 code on GM vehicles. We are not affiliated with him, but he ..., Defective vent valves, fuel tank filler necks, EVAP hoses, carbon canisters, gaskets, and fuel tanks are all potential causes of code P0449. Since a code P0449 relates to a leak in the evaporation system, anywhere that fumes could be escaping is a potential cause. Missing fuel cap. Defective evaporative vent valve. Damaged fuel cap., 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., 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:..., What is a P0449 on a Chevy Silverado or GMC Sierra? A P0449 Code is an " Evaporative System Vent Control Circuit Malfunction ." This means the onboard computer (ECM) is seeing a problem in the EVAP system., This p-code is pointing to a fault in the EVAP Canister Vent Solenoid Valve. This is actually a fairly common fail item on these vehicles. Make sure there are no broken, disconnected or clogged vacuum lines. If the visual inspection checks ok, suspect a faulty vent solenoid valve., Gmc Check Engine Code P0449 WebDtc Code P0449 gm-dtc-code-p0449 2 Downloaded from legacy.ldi.upenn.edu on ... trouble code include the following: Step 1: Check your fuses, there may be a fuse that powers the vent solenoid. Step 2: Check for a rubbed-through or chafed wiring harness., 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., There are several potential causes of code P0449 in a GMC Sierra. These causes can include: Faulty vent solenoid: The vent solenoid controls the flow of fuel vapors in and out of the charcoal canister. If it fails or becomes clogged, it can trigger the code P0449. Wiring issues: Damaged or corroded wiring in the vent solenoid control circuit ..., What Does the P0449 Code Mean? This trouble code indicates that the evaporative control (EVAP) system vent valve solenoid isn’t working as it should. Sometimes the problem is the vent itself, but it …, P0452 Chevrolet Code - Fuel Tank Pressure Sensor Circuit Low Voltage - Code Popularity: 115,159 Views - Repair Importance Level: 1/3 ... The Diagnostic Trouble Code (DTC) will be set if the fuel tank pressure sensor voltage is less than 0.15 V for greater than 10 s. P0452 Chevrolet Code - Fuel Tank Pressure Sensor Circuit Low Voltage. How to Fix., 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 ..., Code P0449. Hello all, new to this site but looking for info on this code if anyone has had this problem. 2015 Colorado Z71 crew cab. This code P0449 says evap issues. So I’ve changed the gas cap and the vapor canister purge valve under the hood., 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 $150 per hour., 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) - YouTube, 2000 PONTIAC GRAND PRIX. Engine Performance problem. 2000 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic. 2000 Pontiac GTP (3.8 Supercharged) fault codes P0449 and P0401. For the P0049: I have replaced the Purge Valve located on top of the engine, the vapour canister is in good shape and does not leak, and the wiring "LOOKS" okay., 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, 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 more