Question about 2006 GMC Sierra

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2006 gmc sierra 1500 4.3 . check engine light on. code po449 on reader. is it canister purge solenoid or vent valve solenoid

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    Purge valve solenoid 1999 delta 88

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More than likely the evaporator vent valve.

Posted on Sep 28, 2010

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I have a PO449 code. I changed the vent valve canister, and the vent purge valve. Cleared code, and it the check engine like came right back on?


have you checked the power and ground supplies to these valves? You can test the ones you replaced by applying direct battery voltage and ground to the solenoids. If they are good, you will hear a click. This would indicate a loss of power or ground on the circuit to the new ones

Jan 05, 2016 | 2011 Chevrolet Chevrolet HHR LT

1 Answer

My check engine light is on in my 2008 GMC SIERRA 1500 pickup with 5.3 V8 I have 2 fault codes, PO449 & PO455. I tried removing battery cable no help. Can anyone steer me in righ direction. Thanks


First check the tightness of your gas filler cap as this can cause the codes to set. To erase the codes you will need a scan tool or code reader . Check the wiring and connections for the EVAP vent solenoid . Fuel tank pressure sensor may be bad .

Dec 11, 2015 | GMC Cars & Trucks

1 Answer

Po449 0n 2006 chevy cobalt


P0449 control vent valve/solenoid circuit malfunction, This code necessarilly deal with replacing the vent solenoid it about the circuit,the evap vent solenoid circuit may have rub through on the frame (located on the back of the fuel tank),it can also be the connector,the vent solenoid itself,or the connector

Mar 24, 2012 | 2005 Chevrolet Silverado

1 Answer

My 2003 chevy silverado 1500 4wd (5.3 Vortec) has a trouble code (po449 & 455) I know what that problem is but, I do not know where the locations of this problem would be. PO449 is a Evaporative...


The first thing I would check is the fuel cap. Your vehicle uses a closed vent system to control the fuel vapors in the tank and then vent the vapors to the engine intake system to burn. so you have a leak either your purge/ vent solenoid is stuck or open all the time not allowing the on board diagnostics to run the test or you may a bad fuel cap, and it is venting to the atmosphere allowing the gross leak. The purge/ vent valve is under the vehicle next to the charcoal canister.

Feb 16, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Loolking for code P0445 what does this mean


P0445- EVAP purge control circuit fault!! Check your gas cap, this will cause insufficient vacuum activating the SES indicator. Check the following

a) Absent or tampered fuel cap.

b) De-linked or faulty fuel tank pressure sensor.

c) De-linked, damaged, pinched, or blocked EVAP purge line.

d) De-linked or erroneous EVAP canister purge valve.

e) De-linked or incorrect EVAP vent solenoid.

f) Open ignition feed circuit to the EVAP vent or purge solenoid.

g) Tampered EVAP canister.

h) Leaking fuel sensor assembly O-ring.

i) Leaking fuel tank or fuel filler beck

Sep 29, 2010 | 2008 GMC Sierra 1500

2 Answers

I have 2006 GMC Sierra SLE 4WD 5.3 liter and my engine light comes on giving me the code PO449 Evaporative Emission Control System Vent Valve/ Solenoid Circuit Malfuction. What could cause this code to...


There is a solenoid that open and closes with 12 volts, usually located close to the fuel filler tube area. This open to allow you to fill your tank, then closes after some inputs for the computer are satisfied, and then a pressure sensor verifies the system is working. First, make sure the cgas cap is tight, and if the light doesn't go away in a couple days of normal driving, get the solenoid checked.

Jun 23, 2010 | 2006 GMC Sierra 1500 2WD

2 Answers

Codes po449 and po455 came on. what is my problem


p0449evap emissions system control valve vent/solenoid circuit malfunction p0455evap emissions system control leak detected [gross leak] usually u check ur gas cap and vent lines for a problem because it is usually the problem but check the wiring and connections to the purge valve also check for leak around the purge valve

Jun 10, 2010 | 2008 GMC Sierra 1500 2WD

2 Answers

2002 GMC Z-71 Check Engine Light codes????


Off hand, it's by your oil fill tube on top off motor.

Mar 30, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

I am getting codes Po449 and P0455 on my 2004 GMC Sierra 1500. I put a new fuel cap and then had the computer reset. The engine light went away but came back later that day. What do you suggest I do nest?


This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Assuming you put on the proper gas cap and one of high quality, I would inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary.

Mar 12, 2010 | 2004 GMC Sierra 1500 Crew Cab

1 Answer

Check engine light on 2004 GMC Yukon XL


Code po449 is the canister vent valve solenoid error.This is a common problem with these valves because they are under the truck in the rear by the spare tire and they get all the dirt and water and snow,if you live in an area where you get snow.You will find it on the canister under the vehicle by the spare tire.

Nov 18, 2009 | 2006 GMC Yukon Xl Denali

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