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My 00 xterra had a code of po446

I replaced the vent control valve cause it had a code of po 455 witch came back on and now its also got a code of po446 i just wanna get my inspec sticker and cant till its fixed already spent 500 buck on vent control valve help please

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  • Cars & Trucks Master
  • 14,333 Answers

Trouble Code: P0446

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.

Posted on Dec 03, 2012

6 Suggested Answers

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Posted on Jan 02, 2017

  • 104 Answers

SOURCE: I have a 2004 Avalanche, 49K mileage, code PO446,

That is an EVAP code. its a vent control code. you can manually test it by powering it up if you know where its at. i cant remember exaclty where its at off the top of my head but its only 2 wires. using a volt meter you want to make sure power is getting to it, but you cannot activate it without dealer scan tool.hmmm if you can figure out which is ground and power when you give it 12 volts it should click. meaning your vent solenoid works and you have wiring problems or its leaking.

EVAP problems are hard to finde with out scanners. you can change the vent solenoid and hope it fixes it. but a code points you to the direction of a problem. hopefull its not wiring problems. in the northern states with snow. ice can pull out wires and also get clogged in the vent solenoid and lock it up. its either wiring or bad or a leaking solenoid. check condition of wires. if they look good try a vent soleniod.

if that doesnt fix it after a engine light reset and 2 weeks or so. then goto dealer. you need to reset it after repair. light will not go off on its own.GOOD LUCK

Michael
ASE certified.
plz rate

Posted on Apr 29, 2009

  • 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

SOURCE: check engine light

it should be mounted on the charcoal canister near the fuel tank

Posted on Sep 13, 2008

  • 7353 Answers

SOURCE: 99 Silverado code PO 300 what causes it? What parts needed to fix

p0300 is a random misfire. A scanner will need to tell the primary cyls that have problems. A (qualified) repair shop will need to check it. Could be from vac leaks, to fuel pressure, to spark problems????/

Posted on Dec 16, 2009

  • 518 Answers

SOURCE: 2003 ford escape.......code p0446 Evaporative

Most likely evap vent solenoid needs to be replaced. Locate replacement solenoid at auto parts store or dealer & replace.

Posted on Apr 04, 2011

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1 Answer

Buick rendezvous 2002 from wheels, have 2 codes PO446 PO453


code p 0446 refers to evaporative emission (EVAP) system---vent control---circuit malfunction===causes --wiring---EVAP canister purge valve ---ECM
replace the purge valve
code p 0453 refers to EVAP pressure sensor --high input ===causes --wiring short to positive --EVAP pressure sensor ---ECM
replace the sensor

Nov 02, 2015 | 2005 Buick Rendezvous

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P0446 code


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

Aug 01, 2014 | 2003 Pontiac Grand Am

1 Answer

Code # PO446


P0446 Nissan - Evaporative System Canister Vent Control Valve Circuit
Possible causes - Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Vent control valve harness is open or shorted
- Vent control valve circuit poor electrical connection
- Faulty vent control valve

Tech notes Before replacing any parts, try re-tighten the gas cap and clearing the code. If the cap or cap seal is damage replaced cap and clear the code.


Apr 12, 2014 | Nissan Pathfinder Cars & Trucks

1 Answer

Changed the evap soleniod and pvc valve and rubber elbow on the pvc valve, code po446 still comes on the scan tool and now the car is using more gas. This on a 2003 grand am


PO 446 --Evap Vent Control Circuit Malfunction

You need to work from factory diagnostic charts
& have an Evap Smoke Machine not be changing parts
until you find the problem

Mar 06, 2013 | 2003 Pontiac Grand Am

1 Answer

Code for po446 1999 lexus gs300


more likely replace vent valve.

Feb 23, 2013 | 1999 Lexus Gs 300

1 Answer

Codes po 123 po335 po446


Code 123 is a problem with the throttle position sensor circuit.
Code 335 is a problem with the crank position sensor circuit.
And code 446 is for a EVAP control valve problem.
These components would need to be tested to find out if they are faulty.

Dec 13, 2012 | Hyundai Motor 1998 Accent

1 Answer

PO446 OBD code on 2005 4.8 liter Chevy Silverado


  • Evaporative Control Vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain

    vacuum during test.

    Possible causes

    • Faulty vent valve
    • Open, short or excessive resistance on Vent valve control circuit
    • Blockage of vent valve
    • Bad PCM
    Possible solutions:
    Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM I hope this atleast narrowed it for you.

Dec 27, 2011 | 2005 Chevrolet Silverado 1500 2WD

2 Answers

My engine light came on


Trouble Code: P0455


EVAP Large Leak Detected

Possible Causes:


EVAP purge solenoid is damaged or it has failed

Fuel tank cap is damaged, missing or the wrong part number.(Check the fuel cap). replace if not the factory type.

NVLD switch is damaged or it has failed

Jul 14, 2009 | 2000 Nissan Xterra

1 Answer

I have a 2001 nissan sentra xe and my check engine light is on i had a diagnostic test and the codes PO 455 and PO 0440 came back what does this mean?


PO 455- Evaporative emission control System leak detected (check exhaust system, egr valve, or entire intake and exhaust system)


PO440- Evaporative Emission System Malfunction (also check oxygen sensor)

Jul 13, 2009 | 2001 Nissan Sentra

2 Answers

1997 toyota camry check engine light on codes are po441,po446


p0446 is an evap code for incorrect purge flow, check the rear vacume switching valve. its above the rear sub frame

Apr 05, 2009 | 1997 Toyota Camry

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