Chevrolet dtc p0449-00

What are the Possible Causes of the DTC P0449 Hyundai? NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes. Purge Control Valve harness is open or shorted. Purge Control Valve electrical circuit poor connection. Faulty canister vent control valve.

Chevrolet dtc p0449-00. 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.

The Chevrolet Nova was one of the most successful compact cars of all time. Learn about every Chevy Nova model, plus pictures, prices, and more. Advertisement The Chevrolet Nova wa...

Oct 27, 2022 · in this video I'm gonna share with you the step by step process of how to diagnose and fix a P0449 Trouble code on a Chevrolet Traverse, Enjoy!#P0449 #evap Síntomas del código OBD2 P0449 Chevrolet. Los síntomas de un código de avería P0449 Chevrolet normalmente son: Se enciende la luz de fallo de motor (Check Engine). Pérdida de potencia en el vehículo. Aumento en el consumo de combustible. Olor a gasolina en el área del vehículo. Causas del código DTC P0449 Chevrolet This trouble code is a reference number that is given to you when you plug your Camaro 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 …Dec 19, 2018 · 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. Meaning. The OBD2 code, P0449, indicates that the evaporative emission control system vent valve or solenoid has malfunctioned. The ECU senses this fault and sends a signal for the “Check Engine Light” to light up on the dashboard. This is a generic signal that serves as a first step in determining a problem within the emissions system. Chevrolet is an American icon, known for the Camaro, Corvette, Malibu, Impala and more. Take this quiz to see if you can recognize the most memorable '70s Chevys! Advertisement Adv...Chevrolet is an American icon, known for the Camaro, Corvette, Malibu, Impala and more. Take this quiz to see if you can recognize the most memorable '70s Chevys! Advertisement Adv...The speedy 1965 Chevrolet Nova SS had options like upgraded suspension components and sintered metallic brake linings. Learn more about this Chevy. Advertisement Perhaps the toughe...

Diagnostic Fault Information. Circuit/System Description. The evaporative emission (EVAP) vent solenoid valve is a normally open valve. Battery voltage is supplied to the EVAP …Mar 2, 2022 · When the trouble code P0449 is set, this is an indication of the EVAP system vent valve solenoid malfunctioning which results in more hydrocarbons being expelled into the atmosphere. P0449 Causes. Missing, defective, damaged, or loose gas cap (most common) Defective EVAP Canister Vent Control Valve. 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.Customer Complaint: This 2019 Chevrolet Traverse with a 3.6 liter engine came into the shop with a complaint of a check engine light and stalling problem. The customer states that the vehicle will randomly shut off. The codes in this vehicle were: P0171 - Fuel Trim System Lean Bank 1. P0174 - Fuel Trim System Lean Bank 2.Quick, easy, and cheap fix for check engine light code P0449Top Five Key Takeaways About P0449 OBD-II Trouble Code. P0449 indicates a vent valve malfunction in the evaporative emission control system, causing issues managing fuel vapors. Common symptoms include the check engine light, fuel fumes, refueling difficulties, and fuel gauge inaccuracies.this video will show you how to fix p0449 emissions dtc on gm vechicles, like tahoe, suburban, yukon, avalanche, silverado, escalade, express.disclaimer:warn...

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. P0449: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.Web what are the possible causes of the code p0449 chevrolet? HOW TO FIX P0449 EMISSIONS DTC ON GM VECHICLES, TAHOE, Doovi. P0449 Code Chevy Tahoe. Web when the trouble code p0449 is set, this is an indication of the evap system vent valve solenoid malfunctioning which results in more hydrocarbons being expelled.753. 44K views 1 year ago. in this video I'm gonna share with you how to diagnose and Fix the cause of a P0449 Trouble code On a GMC/CHEVY truck with a …Chevrolet car models come in all shapes and price ranges. See pictures and learn about the specs, features and history of Chevrolet car models. Advertisement Chevrolet has been a c...

Honda vtx 2004.

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 …This harness chaffing could cause shorting of any number of circuits to ground. Due to the number of circuits in the harness, there is a wide variety of different symptoms that could occur depending on which circuit(s) are damaged. Cause 3. This Cause pertains to vehicles equipped with engine 3.0L, LM2 only.Also below is an excerpt from the DTC P0499 for my 1999. Circuit Description A voltage is supplied directly to the EVAP Vent valve solenoid. The PCM controls the solenoid by grounding the control circuit via an internal switch called a driver. ... A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and …P0017 is a generic powertrain code that applies to all OBD-II-equipped vehicles. This DTC indicates that the camshaft position sensor and the crankshaft position sensor aren’t timed together as they should be. The manufacturer sets the particular degrees it must be off for the code to set. The crankshaft position sensor (CKP) and …

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.This diagnostic procedure supports the following DTC: DTC P0449 Evaporative Emissions (EVAP) Vent Solenoid Control Circuit. Conditions for Running the DTC. The engine speed is more than 400 RPM. The system voltage is between 6–18 volts. DTC P0449 runs continuously once the above conditions are met.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.The Chevrolet Nova was one of the most successful compact cars of all time. Learn about every Chevy Nova model, plus pictures, prices, and more. Advertisement The Chevrolet Nova wa...Car: 2019 Chevrolet Malibu 1.5L LT. Mileage: Approximately 80,000 miles. Problem: Check Engine Light (CEL) illuminated with DTCs P0449 and P0455. DTC (s): P0449 EVAP vent solenoid valve control circuit, P0455 EVAP system large leak detected. Solution: Replace vent valve wire harness, PN 84944780 (supersedes 84427106)#1 · Jan 23, 2009. I need some help please. I have an error code P0449 which i know is the Evap solenoid. I tried talking to the dealer for the 80k emissions warranty but they said …Code P0449 is a diagnostic trouble code (DTC) that indicates a problem with the evaporative emission control ... Special Price $34.00 Regular Price $40.00. DENSO 234-4127 | Oxygen Sensor. ... Chevrolet Traverse Reliability And Common Problems.Subscribed. 753. 44K views 1 year ago. in this video I'm gonna share with you how to diagnose and Fix the cause of a P0449 Trouble code On a GMC/CHEVY truck with a 6.0L Engine, Enjoy! ...more.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...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. The most …

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...

Here's why gratitude is hard... This morning I woke up later than I had planned. I had all the intention in the world to wake up between 5:00 and 5:15... Edit Your Post Publis...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 is normally not an immediate threat to the drive-ability of your Canyon.Code P0449 is a diagnostic trouble code (DTC) that indicates a problem with the evaporative emission control ... Special Price $34.00 Regular Price $40.00. DENSO 234-4127 | Oxygen Sensor. ... Chevrolet Traverse Reliability And Common Problems.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 …This diagnostic procedure supports the following DTC: DTC P0449 Evaporative Emissions (EVAP) Vent Solenoid Control Circuit. Conditions for Running the DTC. The engine speed is more than 400 RPM. The system voltage is between 6–18 volts. DTC P0449 runs continuously once the above conditions are met.2014 Chevrolet Express 6.0 I have a p0449 code this related to a vent solenoid valve ,but I remove it and do a bench test and the part is working what … read more. Bart. Master Automotive Technici... High School Diploma. 6,514 satisfied customers.This trouble code is a reference number that is given to you when you plug your Camaro 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 Camaro.The Chevrolet Nova was one of the most successful compact cars of all time. Learn about every Chevy Nova model, plus pictures, prices, and more. Advertisement The Chevrolet Nova wa...

Lea simmons funeral home.

Ka fsu.

Here's why gratitude is hard... This morning I woke up later than I had planned. I had all the intention in the world to wake up between 5:00 and 5:15... Edit Your Post Publis...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. A scan tool will display the commanded state of the EVAP Vent Solenoid Valve as Not Venting (On) or Venting (Off). The Diagnostic Trouble Code (DTC) will be set when the ECM detects the EVAP vent solenoid valve control circuit is open within 0.25 s. P0449 GMC Code - Evaporative Emission Vent Solenoid Valve Control Circuit.Mar 28, 2016 · Depending on year, make, and model, DTC P0498 may have number of causes. Here are some of the most common. Honda – A number of Honda vehicles, including Element, Civic, and Accord, have reported faulty vent shut valves. Replacement usually fixes the problem. However, always finish circuit diagnosis before condemning the valve itself. Aug 7, 2023 · Causes and Fixes GMC or Chevy P0449 engine code: Evaporative Emission Vent Solenoid Valve Control Circuit Malfunction.Amazon Link to Smoke Machine: https://a... The 1940s Classic Chevrolet Cars Channel covers popular antique Chevrolets from the decade. Take a look under the hood of 1940s classic Chevrolet cars. Advertisement The 1940s Clas...#1 · Jan 23, 2009. I need some help please. I have an error code P0449 which i know is the Evap solenoid. I tried talking to the dealer for the 80k emissions warranty but they said …The Inflatable Restraint Sensing and Diagnostic Module uses the Multi-Axis Acceleration Sensor to determine if the vehicle is in a rollover or near collision incident. The Diagnostic Trouble Code (DTC) will be set if the Yaw Rate signal is out of the specified range. C0196 Chevrolet Code - Yaw Rate Signal.This trouble code is a reference number that is given to you when you plug your HHR 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 Inflatable Restraint Sensing and Diagnostic Module uses the Multi-Axis Acceleration Sensor to determine if the vehicle is in a rollover or near collision incident. The Diagnostic Trouble Code (DTC) will be set if the Yaw Rate signal is out of the specified range. C0196 Chevrolet Code - Yaw Rate Signal.I have to replace an Evap system vent solenoid on this 07 Silverado. Here's some Do's & Dont's when performing this repair.#wrenchingwithkenny #keepwrenching... ….

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 Buick Code - Evaporative Emission Vent Solenoid Valve Control CircuitP069E code indicates that the FPCM has identified an issue in the fuel system and is requesting the PCM turn on the check engine light. The FPCM supplies and regulates the voltage that goes to the fuel pump and the fuel pump relay. It can be a stand-alone module or a computer integrated into the PCM. Usually, the FPCM is a stand alone module.Check engine light code P0449 Chevrolet Forum Chevy Enthusiasts Forums Web this video will show you how to fix p0449 emissions dtc on gm vechicles, like tahoe, suburban, yukon, avalanche, silverado, escalade, express.disclaimer:warn. ... code said 02 sensor replaced both on right side, now runs rough and light is still on you shoul. The gm dtc ...As of June 2021 there are over 2,000,000 podcasts and over 48 million episodes. Now, as of June 2nd, 2021, 10:00 am pst, another one has been added to the... Edit Your Post Publish...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.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: Evaporative ... The P0449 code 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. Specifically, the system’s vent valve doesn’t match the required state for a ... Jan 18, 2019 ... Código P0449: Qué Significa y SOLUCIÓN【Actualizado 2024】 . Mecanica Automotriz PRO · 2.9K views ; GMC / CHEVY Truck - DTC P0449 EVAP Vent ...Mar 5, 2018 · 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 ... 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 ... Chevrolet dtc p0449-00, 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 is normally not an immediate threat to the drive-ability of your Canyon., The ECM monitors the status of the driver. 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 Buick Code - Evaporative Emission Vent Solenoid ..., 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., How to Fix the DTC P0449 2017 Chevrolet Silverado? Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and …, Quick overview of causes and fixes P0449 OBDII error code GMC and Chevy. “Evaporative System Vent Control Circuit Malfunction.”Read here for more informatio..., What is the Cost to Diagnose the Code P0449 2015 Chevrolet Silverado? Labor: 1.0. To diagnose the P0449 2015 Chevrolet Silverado 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 …, 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 ..., Síntomas del código OBD2 P0449 Chevrolet. Los síntomas de un código de avería P0449 Chevrolet normalmente son: Se enciende la luz de fallo de motor (Check Engine). Pérdida de potencia en el vehículo. Aumento en el consumo de combustible. Olor a gasolina en el área del vehículo. Causas del código DTC P0449 Chevrolet , Apr 24, 2024 · When you get a P0449 error code on your Chevy, the problem is most frequently caused by the vent valve failing stuck open. When this happens, you need to replace the whole canister which has the vent valve attached to it. , 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 …, 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, The most common cause of code P0449 is failure of the vent valve caused by the presence of dirt or charcoal particles, or a failure of the vent valve control solenoid that prevents the valve from opening or closing. Other possible causes include-. Burnt, damaged, shorted, or corroded wiring and /or connectors. Open circuits., Aug 20, 2018 · 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. P0449: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction. , 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., The ECM only monitors the EVAP control system pressure sensor when the fuel tank level is between 25 and 75 percent. The code P0452 is set when the ECM reads a low voltage signal from the EVAP control system pressure sensor. Note: Circuit Low Input codes are often the result of low battery voltages (that can have many possible causes), bad ..., 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 ..., In depth diagnosis and inexpensive repair of common P0449 engine code on these popular Chevy and GMC light trucks., 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 2017 Chevrolet Silverado Code - Evaporative Emission Vent Solenoid Valve Control Circuit, Buick. Code: P0449. Definition: EVAP Vent Solenoid Control Circuit Malfunction. Description: Engine started; system voltage over 10.0v and the PCM detected the Actual and Commanded state of the Vent Solenoid driver control circuit did not match for 30 seconds. Cause: Vent solenoid control circuit is open or shorted to ground., Car: 2019 Chevrolet Malibu 1.5L LT. Mileage: Approximately 80,000 miles. Problem: Check Engine Light (CEL) illuminated with DTCs P0449 and P0455. DTC (s): P0449 EVAP vent solenoid valve control circuit, P0455 EVAP system large leak detected. Solution: Replace vent valve wire harness, PN 84944780 (supersedes 84427106), The most common cause of code P0449 is failure of the vent valve caused by the presence of dirt or charcoal particles, or a failure of the vent valve control solenoid that prevents the valve from opening or closing. Other possible causes include-. Burnt, damaged, shorted, or corroded wiring and /or connectors. Open circuits., 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 …, The Chevrolet 5.7-liter (350-cubic-inch) engine employs an overhead valve design that requires occasional maintenance. Adjusting the clearance between the valve stem and rocker arm..., Jul 31, 2016 · The most common cause of code P0449 is failure of the vent valve caused by the presence of dirt or charcoal particles, or a failure of the vent valve control solenoid that prevents the valve from opening or closing. Other possible causes include-. Burnt, damaged, shorted, or corroded wiring and /or connectors. Open circuits. , Even slight variations in the air/fuel mixture will cause the converter temperature to rise significantly. The “Catalytic Converter Efficiency” Diagnostic Trouble Codes (DTCs) P0420 and P0430, are among the top 10 DTCs technicians face. And while the description might imply a failed converter, odds are the ultimate fault lies somewhere …, 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 …., 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 …, There’s a tool to check the fit right there. Fuel Vapor Hose – A leak in the fuel vapor hose that leads from the fuel tank to the intake will definitely throw P0442 in your Silverado. Gas Cap Bad – A bad fuel cap can cause the P0442 code to be thrown for sure. The Silverado will typically be warning you to tighten the fuel cap., Aug 21, 2019 ... P0449 With Good Vent Valve ... GMC / Chevy Truck -DTC P0449 EVAP Vent Solenoid Control Circuit ... 11:00 · Go to channel · AdBlue Diagnostics Made&nb..., The OBD-II scanner error code P0449 problem is a generic issue, but it does not have a cut-and-dry solution. The cause can stem from a variety of factors, as can the resolution. Unfortunately, there are typically no warning signs of this issue before the MIL is illuminated, then it is just a process of elimination to find the solution., Dec 19, 2018 · 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. , The generic description for the P0449 trouble code is the Evaporative emission (EVAP) system, vent valve circuit malfunction. This code is set when the vehicle’s PCM detects an electrical issue with the said valve. The EVAP is short for the Evaporative emission system, a pollution-control device that prevents the gas fumes inside the tank ...