Question about 2000 Chevrolet Silverado 1500

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Got a PO449 code on an 09 Colorado. AutoZone gave me 4 possible parts so thought I'd start with the least expensive. The purge valve on the engine I couldn't reach. Got another vent/purge valve but can't find where it mounts. Thought it might be on the EVAP canister by the spare but it didn't go there. Any ideas?

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There are two vent/purge valves - one on the engine that takes vapor from the gas tank and cycles it into the intake manifold. The other one is connected by a hose to the vapor canister. I don't know which one you bought, but it can't hurt to replace both - the one that fails most often is the one connected to the canister and is usually mounted under the vehicle at the back. It often fails due to road contamination getting into the solenoid.

Posted on Dec 21, 2017

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Posted on Jan 02, 2017

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csmock132

Clint Smock

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SOURCE: getting an error code of PO449 for a check engine

You are right. You need the vent valve not the purge valve. The vent valve is a dealer item. Also this is a common problem and GM has released a bulletin on this that involves moving the location of the valve and running some new lines. It comes as a kit from GM, and it costs about a 100 bucks.

Posted on Dec 02, 2010

Kerry Lewis

  • 134 Answers

SOURCE: code p0449 came on in

I am sending you a little info on your problem.. Hope it helps.. Best of Luck..

2006 Chevrolet Colorado LT 2.8L, Vin 8, Eng Cfg L4 Customer Concern: Current Powertrain Control Module (PCM) code P0449. Tests/Procedures: 1. Inspect the evaporative vent solenoid, near the fuel tank and evaporative canister. Look for wire damage, corrosion.

2. Check voltage to the solenoid on the Orange wire. It should be battery voltage, backprobing. If not, check the voltage level on the CAN VENT fuse, #69 in the Underhood Bussed Electrical Center (UBEC).

3. Cycle the evaporative vent solenoid with a scan tool. The solenoid should click.

4. Backprobe the White wire, pin 22 of the blue PCM connector. The voltage on this wire should be battery voltage with the solenoid off and close to 0 volts with the solenoid on. Potential Causes: Evaporative Vent Solenoid
Solenoid Wiring
Tech Tips: The evaporative vent solenoid is attached to the side of the evaporative canister above the spare tire.

Posted on Aug 21, 2011

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1 Answer

What do i do when my 09 silverado keeps showing a code po449


P0449 = Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.
The Powertrain Control Module (PCM) / Engine Management Computer (EMC) / Engine Control Module (ECM) has detected a fault with the circuit that controls the vent for evaporative emission systems vapor.
This means either the valve is not working or the wiring to the valve is not carrying the proper signal to the valve, or from the valve back to the computer. If you are familiar with troubleshooting this type issue, this should give you indication of where to start. If not, bring it to a qualified mechanic.

Oct 28, 2016 | Cars & Trucks

2 Answers

I replace gas cap and evap vent solenoid and stel have c ad po449?


have you check the purge valve, and your vacuum lines? here's a vid you might want to check out:

https://www.youtube.com/watch?v=AlfOSMmisPg

Jun 20, 2015 | 2007 Chevrolet Impala LS Sedan New Cars

1 Answer

09 Chevy colorado code p449


PO449-- Evap Vent Valve/Solenoid Circuit Malfunction

PO441--Evap Purge Valve Incorrect Flow
PO 443,444,445 Purge Control Valve Issues


There was no reason to change the gas cap or
purge control valve

Didn't Google the code & use it correctly to diagnose
the problem

Mar 23, 2013 | 2009 Chevrolet Colorado Extended

1 Answer

Code po449 2009 cobalt


The PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.

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

Explanation:
The solenoids and system wiring are monitored for opens or shorts

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

Feb 17, 2013 | 2009 Chevrolet Cobalt

1 Answer

Getting an error code of PO449 for a check engine light. this says it is the Evaporative Emissions Control System Vent Valve/Solenoid Circuit Malfunction. I keep looking for a replacement part of the vent...


You are right. You need the vent valve not the purge valve. The vent valve is a dealer item. Also this is a common problem and GM has released a bulletin on this that involves moving the location of the valve and running some new lines. It comes as a kit from GM, and it costs about a 100 bucks.

Dec 02, 2010 | 2005 Chevrolet Silverado

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

1 Answer

06 Colorado wont startat times


none of these codes will cause a no start condition.. have your fuel pressure and flow volume checked

Dec 31, 2009 | 2006 Chevrolet Colorado

1 Answer

WHAT TO DO ABOUT TROUBLE CODES PO449 & PO141 ON 01 VENTURE


code is P0449

The PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.

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

Explanation:
The solenoids and system wiring are monitored for opens or shorts

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


A code P0141 may mean that one or more of the following has happened:
  • open or short to ground in the wiring harness
  • O2 heater circuit wiring high resistance
  • O2 heater element resistance is high
  • Internal short or open in the heater element
Note: Typically a failed catalytic converter does not cause this code. You're more likely to see a P0420 code for a failed converter.
Possible Solutions
  • Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
  • Repair short or open or high resistance in wiring harness or harness connectors

Oct 10, 2009 | 2001 Chevrolet Venture

1 Answer

I am getting codes PO440 PO443 PO 449 on my 2000 Silverado and the SES light is on


PO440 Possible Causes:
Charcoal canister is loaded with fuel or moisture
Fuel filler cap is loose, cross-threaded, damaged or wrong part
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
Fuel tank pressure sensor is damaged, disconnected or it failed
Fuel tank vapor line(s) is clogged, damaged or disconnected
Purge valve vapor line is clogged, damaged, or disconnected
Purge or vent solenoid power circuit is open (check the fuse)
PCM has failed

PO443:
Purge solenoid control circuit is open or shorted to ground
Purge solenoid control circuit is shorted to system power (B+)
Purge solenoid power circuit is open (test the ENG1 fuse)
Purge solenoid is damaged or has failed
PCM has failed

PO449:
Sames as PO443.

Hope this helps.

Mar 06, 2009 | 2000 Chevrolet Silverado 1500

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