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
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This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 02-06-04-037 (Section 06 -- Engine/Propulsion
System).
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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
To install:
Purge Solenoid Valve-2.4L Engines
To install:
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.
Vent Solenoid Valve-2.2L & 2.4L Engines
To install:
Hope this help (remember commetn and rated this).
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,,,
Inside of the gas cap. You probably need a new one.
SOURCE: Check Engine Code PO446
purge control valve sticking either open or closed. location depends on what engine you have
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
Testimonial: "Looks like the information will help in resolving the code problem. I will further reply when completed / repaired"
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?
EVAP Vent Control Solenoid Circuit Malfunction
Possible Causes:
Vent solenoid circuit open, shorted to ground or to power (B+).Vent control solenoid is damaged or has failed..PCM has failed.TSB 00-060 (7/00) contains information related to this code.Trouble Code: P0455
EVAP System Gross Leak (0.080") Detected
Possible Causes:
.EVAP control system pressure sensor is damaged or has failed.EVAP purge solenoid or canister vacuum line loose or off.EVAP purge solenoid is damaged or has failed.EVAP emission canister is dirty, restricted or full of water.EVAP canister vent control valve is damaged or has failed.Fuel tank cap loose, missing or it is the wrong part number.Fuel tank temperature sensor is damaged or has failed.Fuel tank vacuum relief valve is damaged or has failed.Large leak in the EVAP canister or in the fuel tank area.ORVR system is damaged or has a large leak in a component.Refueling control valve is damaged or has failed.Vacuum hose leaking between intake manifold and Purge valve.Here are the codes,take part back and get refund.
Trouble Code: P0446
EVAP Vent System Performance
Possible Causes:
EVAP vent fresh air hose is clogged, kinked or restricted.
EVAP Vent solenoid is contaminated, damaged or has failed.
EVAP Canister plugged or severely restricted .
Fuel Cap or EVAP Service Port leaking.
Fuel vapor lines or purge lines damaged or leaking .
FTP sensor is out-of-calibration, damaged or "skewed" .
PCM has failed .
TSB 61-65-31A contains a repair procedure for this code .Now which one is it.
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