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Have 2006 Suburban flex fuel with error code P0449 suggestions please

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The evaperative coil is malfuntioning, the code reads Evaporative Emission System Vent Valve/Solenoid Circuit check the canister thats black see if the cap has came off or the solenoid is dirty if so use berry-mans carb cleaner to clean it soft with a tooth brush also check to see if canister is cracked if it has a vachum leak it will cause the same problem, it could be a cracked hose at the device or the fuel tank.

Posted on Jun 19, 2009


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What makes my Chevy malibu 2005 v6 put system code po449 out

P0449 - OBD II Trouble Code Evaporative System Vent Valve/Solenoid Circuit Malfunction Our emissions expert has put together the following information about the P0449 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
OBD II Fault Code
  • OBD II P0449
Fault Code Definition
  • Evaporative System Vent Control Circuit Malfunction
What does this mean? 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 and purges these captured fuel vapors back into the combustion process. The carbon canister, which stores the raw fuel vapors, utilizes a vent valve that allows fresh air to enter the EVAP system. This displaces the fuel vapor as it's purged into the combustion process. Code P0449 indicates that the evaporative control (EVAP) system vent valve solenoid is malfunctioning. This can be caused by either too little or too much electrical resistance or a mechanical problem with the vent valve itself. Symptoms
  • Check Engine Light will illuminate
  • In most cases, there are no adverse conditions noticed by the driver
  • In some cases, there may be a noticeable fuel odor caused by the release of fuel vapors
Common Problems That Trigger the P0449 Code
  • Missing fuel cap
  • Defective Evaporative Vent Valve
  • Defective or damaged fuel cap
  • Distorted, damaged or cracked Fuel Tank Filler Neck
  • Torn or punctured Evaporative system hose(s)
  • Defective Fuel Tank Sending Unit gasket or seal
  • Split or damaged Carbon Canister
  • Defective or damaged fuel tank
Common Misdiagnoses
  • Fuel cap
  • Evaporative Purge Valve
  • Evaporative Vent Valve
Polluting Gases Expelled
  • HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog

P0449 OBD II Trouble Code

Jan 30, 2017 | Cars & Trucks

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What are the probable causes of DTC P0449?

P0449 -
Detailed information on diagnosing and repairing a P0449 DTC code which refers ...P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit ... OBD-IITrouble Code Technical Description ... 2004 Chevrolet Tahoe 4.8L p0449

EVAP Code P0449 - YouTube

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Jan 07, 2016 | 2004 Chevrolet Chevrolet Impala

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After running diagnostics for check engine light there are 2 fault codes P0449 and P0463. Auto Zone said I needed a new solenoid for $35 but I wasn't sure I could do it myself so I took it to a shop....

P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction, meaning There is air escaping from the gas tank. Often a problem with the gas cap, try tightening the cap, reset the code and see if it comes back on. Essentially it is testing for cracks in the tank.
so do that ,,, remove the cap and put it back tight,, if that code comes up again, just replace the cap, and they can test your old one at the parts store. the other code could be showing up because the computer is sensing a fuel problem, does the fuel gauge fluctuate ?

Jun 22, 2011 | 2006 Isuzu Ascender

2 Answers


Two key technologies help make this Suburban a clean and relatively efficient alternative fuel vehicle: GM's Active Fuel Management cylinder deactivation allows this engine to operate on only four of it's eight cylinders under light load conditions. The onboard computer determines if /when appropriate conditions exist for cylinder shutdown, and similarly determines when reactivation should occur. Under ideal conditions as much as 12-15 percent fuel savings can be realized. Flex-fuel capability compensates for the varying ratios of ethanol in the fuel, and adjusts engine parameters accordingly. Higher amounts of alcohol produce cleaner emissions and generally, (but not always) require re-calibrated fuel delivery.

Jan 31, 2011 | 2004 Chevrolet Suburban

1 Answer

2008 suburban i have code p0449 i change evap solenoid,purge valve and pressure sensor on gas tank im still geting same code

sad to say that you miss on what you did, dtc P0449 was related to vent solenoid contol circuit, purge problem indicates P0443,, check the vent valve connectors supply voltage from the power distribution box, (fuse # 14-tcm/batt) and the other wire(almost white) to ecm C1 #61.

Nov 09, 2010 | GMC Suburban Cars & Trucks

2 Answers

Code p0449 on 2006 silverado

P0449....Evaporative Emission Control System Vent Valve/Solenoid Circuit

Sep 20, 2010 | 2006 Chevrolet Silverado

2 Answers


Hello. Your code indicates that your emission system is acting up. If you live in California, you might have a problem passing the next mandatory emmissions test. The PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.

EVAP (Evaporative Emission System) purge/vent solenoid circuit condition

The solenoids and system wiring are monitored for opens or shorts

Probable Causes
1- Purge or vent solenoids defective
2- Check connector and wiring
3- fuel, saturated vapor canister
4- Failed EVAP vent solenoid

Apr 08, 2010 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

OBD error code P0449 2006 Trailblazer

Go to an autoparts store like Autozone, O'Reilly's, etc., and they'll have a scanner to diagnose the error code for you. It's usually free for this service.

Mar 14, 2010 | 2006 Chevrolet Trailblazer

2 Answers

Error code p0449

i have code reader says p0449 is evaporative emission control system - vent valve / solenoid circuit

Apr 26, 2009 | 2006 Chevrolet Tahoe

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