Question about 2000 GMC Jimmy

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Po446 evap vent code where is the evap vent located

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  • GMC Master
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Some might have an ses p0446, evap emissions vent circuit low. If you take it to the dealer they want 300-400.00 to fix the problem. GM has a service bulletin on this condition and have the updated part for 180.00, thats suppose to eliminate this issue.

Basically the problem is, the evap purge vent valve gets clogged with dirt, especially if the truck is used in dirty conditions. Well I figured there had to be a cheaper way to cure this problem.

Here it is:
1) find the location of the vent valve; its under the truck, locate the charcoal canister on the front of the gas tank and trace the vent line to the vent valve.
2) Take the bracket loose with a 5/8 wrench.
3) Spin the valve around so the side with the hole is facing you.
4) Take an air compressor and blow the vent valve out.
5) reinstall and clear the code and it's fixed.

Now I know the updated part from gm is supposed to keep the valve from clogging ever again, but why spend the money when all you have to do is blow out the vent valve every 50k-100kmi and save your $$$!

Subject: DTC P0446 (Restricted/Blocked EVAP Vent Path) Set, Service Engine Soon (SES) Lamp Illuminated (Replace Hose/Evaporative Emission (EVAP) Canister Vent Asm) #02-06-04-037A - (02/02/2005)
Models:
- 1999-2003 Chevrolet Silverado Models
- 1999-2003 GMC Sierra Models
--------------------------------------------------------------------------------
This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 02-06-04-037 (Section 06 -- Engine/Propulsion System).
--------------------------------------------------------------------------------
Condition
Some customers whose vehicles are operated in dusty type environments, such as farming or mining off-road type applications, may comment about the illumination of the instrument panel SES light, with a DTC of P0446 (Restricted/Blocked EVAP Vent Path) being set.

Cause
Dirt and dust intrusion into the EVAP canister vent hose assembly, resulting in restricted air flow, may cause this condition.

Part Number 15086429 Hose Asm-Evap Emis Cnstr Vent


Removal & Installation
Purge Solenoid Valve-2.2L (L61) Engine

  1. Disconnect the evaporative emission (EVAP) canister purge valve harness connector.
  2. Disconnect the vacuum pipe from the EVAP canister purge valve.
  3. Disconnect the purge pipe from the EVAP canister purge valve.
  4. Remove the EVAP canister purge valve and bracket.
  5. Remove the EVAP canister purge valve from the purge bracket.
  6. Inspect for carbon release in the EVAP canister purge valve ports.
To install:
  1. Install the EVAP canister purge valve on to the purge bracket.
  2. Install the EVAP canister purge valve and bracket. Tighten the purge bracket nut to 71 inch lbs. (8 Nm).
  3. Connect the purge pipe to the EVAP canister purge valve.
  4. Connect the vacuum pipe to the EVAP canister purge valve.
  5. Connect the EVAP canister purge valve harness connector.
  6. Remove the air cleaner outlet resonator.
  7. Disconnect the EVAP canister purge valve harness connector.
  8. Disconnect the engine purge pipe from the EVAP canister purge valve.
  9. Disconnect the engine vacuum pipe from the EVAP canister purge valve.
  10. Remove the EVAP canister purge valve mounting bracket attaching bolt.
  11. Remove the EVAP canister purge valve along with the mounting bracket.
  12. Installation is the reverse of the removal procedure. Tighten the bracket bolts to 71 inch lbs. (8 Nm).

Purge Solenoid Valve-2.4L Engines
  1. Remove the front purge pipe from the evaporative emission (EVAP) canister purge valve.
  2. Remove the rear purge pipe from the EVAP canister purge valve.
    NOTE The EVAP canister may have released carbon particles, which caused this part to fail, and may cause damage to other components. Check the EVAP canister for loose carbon before returning the vehicle to service.
  3. Disconnect the EVAP canister purge valve electrical connector.
  4. Insert a screwdriver between the EVAP canister purge valve and the mounting bracket in order to release the lock tab.
  5. Remove the EVAP canister purge valve mounting bracket attaching nut, if replacing the bracket.
  6. Remove the bracket.
To install:
  1. Install the mounting bracket and the attaching nut for the EVAP canister purge valve. Tighten the nut to 71 inch lbs. (8 Nm).
  2. Slide the EVAP canister purge valve onto the mounting bracket. Make sure the lock tab locks the valve in place.
  3. Connect the EVAP canister purge valve electrical connector.
  4. Connect the rear purge pipe to the EVAP canister purge valve.
  5. Connect the front purge pipe to the EVAP canister purge valve.

Vent Solenoid Valve-2.2L & 2.4L Engines
  1. Raise the vehicle
  2. Loosen the EVAP canister vent valve hose clamp and slide the clamp down the hose away from the EVAP vent valve hose connection.
  3. Remove the hose from the EVAP canister vent valve.
  4. Remove the EVAP canister vent valve by placing a pry bar between the valve and mounting surface, and moving the valve forward.
  5. Remove the clip from the EVAP canister vent valve harness connector
  6. Disconnect the EVAP canister vent valve harness connector.
To install:
  1. Connect the EVAP canister vent valve harness connector
  2. Install the clip into the EVAP canister vent valve harness connector.
  3. Install the EVAP canister vent valve by pushing the mounts into the original holes.
  4. Lubricate the hose end with lubricant.
  5. Install the hose to the EVAP canister vent valve.
  6. Slide the EVAP canister vent valve hose clamp down on to the hose connection at the EVAP canister vent valve.
  7. Lower the vehicle.

Hope this help (remember commetn and rated this).

Posted on Apr 21, 2010

  • jonlcohen
    jonlcohen Oct 27, 2012

    Excellent post. One note: one the GMC Jimmy the valve is mounted above the spare tire. You'll have to remove the tire to get to it.

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  • GMC Expert
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On chevy autos you can replace all the evap parts for less than 100 bucks,,, evap purge valve assembly,,,i found 4 35 bucks at pep boys online,,,,,,,, the whole assembly,,,,,,it under the truck by fuel tank,,, evap solinoid,, 25 bucks auto azone, orielelys,, pep boys,,, under hood on the intake,,,, gas cap bad,,, buy any where,,, be sure you get the one that fits yur car,,,.......if you have a hard start or no start conditon after filling up with gas,,, the evap solinoid on the intake is bad,,,

Posted on Jan 04, 2015

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  • Master
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Inside of the gas cap. You probably need a new one.

Posted on Apr 21, 2010

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Posted on Jan 02, 2017

Anonymous

  • 67 Answers

SOURCE: Check Engine Code PO446

purge control valve sticking either open or closed. location depends on what engine you have

Posted on Jul 21, 2009

khaled hussien

  • 328 Answers

SOURCE: the read out, po446, says

sir .
go to that link refer it very useful information
you will have it all
http://www.aa1car.com/library/evap_system.htm
happy to help you inform mr if need more help or clarification after reading

Posted on Jun 16, 2011

Testimonial: "Looks like the information will help in resolving the code problem. I will further reply when completed / repaired"

dttech

dttech

  • 4803 Answers

SOURCE: 1997 nissan maxima gle obd

The possible causes of Diagnostic Test Code (DTC) P0446 are as follows:

> faulty EVAP Canister Vent Control Valve
> EVAP Control System Pressure Sensor
> EVAP Canister Vent Control Valve circuit open or shorted
> Blocked rubber tube to EVAP Canister Vent Control Valve
> Faulty water separator

What I have found on these vehicles personally, is that the charcoal canister likes to come apart inside and little black charcoal pellets get into places where they don't belong - like the vent valve. Many times I have had to replace the canister and the valve to fix the problem. I only do this however, AFTER checking the circuits to verify that they are working correctly.

If this is your problem, it is likely that several of the hoses need to be removed and cleaned out to prevent another failure.

Please also review this article:

What Else Could Be Wrong?

Posted on Jul 18, 2011

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2 Answers

What does code PO446 mean how do i fix this code problem?


You have an Evap System problem and yes, this can cause poor gas mileage. Possible causes are:
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Its what is called the EVAP. system the code is for the vent solenoid .Gas vapor in a vacuum is drawn from the fuel tank when this vent is commanded to be open drawn into a canister filled charcoal and stored until the canister purge solenoid is commanded to open .
This happens when the engine speed is at a higher RPM level and is supposed to send the vapor to the engine to be burned instead of VOC'S going into the atmosphere .But its a crazy lie the last time I filled up more VOCS got into the atmosphere then a gas tank vent could do in 6 month or so .
You can try cleaning the filter in the vent solenoid it might work but the part is about 70 dollars its in the rear between the tank and the canister look for hoses .

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EVAP Vent System Performance
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