Question about Ford Ranger

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Charcoal cannister purge valve stays open

2003 ford ranger v6 p0443 trouble code keeps setting mil

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  • maureenc406 Apr 23, 2009

    dose the fuel tank pressure sensor have enthing to do with my problem

  • maureenc406 Apr 23, 2009

    thank you very much

  • maureenc406 Apr 23, 2009

    thank you very much



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Fuel Pressure sensor?? - NO

P0443 definition:
EVAP purge/vent solenoid circuit condition

the solenoids and system wiring are monitored for opens or shorts

probable causes:
1- purge or vent solenoids defective
2- check for loose connector and bare wiring
3- fuel saturated vapor canister
4- failed evap vent solenoid

Most likely failed part is the EVAP canister - most people top off their takn and instead of just fumes going to the canister - gas does and saturates the medium (charcoal) so your sensors go crazy!!

There is also a solenoid, and a purge flow sensor, you should always change both as a set, most likely if it is one of them - the sensor is bad.

Thanks for using FixYa - if you need further claification - please use the "Continue with this expert" option so we are connected later.

Thank You !! :D

Posted on Apr 23, 2009


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1st off this code can be caused by a plugged charcoal canister air vent or a fuel loaded canister.
here are common causes, remember this is a problem in the circuit, it doesn't mean the pruge vave is defective, read on below.

* P0443 indicates an electrical problem in the charcoal canister purge
valve. Since it's in a rather hostile environment, check the connector first to be sure the contacts are bright and shiny and that the connector is undamaged and pushed all the way in - should be that tiny little 'click' as the lock tab engages. If there is any doubt at all, make sure all is clean and tight,
clear codes and see if it returns....

Posted on Apr 22, 2009

  • yadayada
    yadayada Apr 22, 2009

    Read this post from a Ford Ranger Forum about your problem, I have not seen this in the shop but it is something to check for.

    I recently had my check engine light on.The scanner told me P0443 Purge Valve Control Fault C.I changed out the purge control valve and solenoid(2 different parts).I also replaced all vacuum hoses only to still have the "check engine".While doing a voltmeter test to the system,I noticed one of the wires coming off of the solenoid routed down underneath the frame.The routing of these wires left them in a spot where they obviously are prone to rubbing.A severed wire was all it was.After fusing these back together.... No More check engine light.Hopefully my pain and frustration can save somebody else this hassle.



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I have code P0443. How can I find out what is wrong?

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I have a blinking check engine light and I have went to have the codes checked out and they show a bad gas cap but the car has a rough idle and I have just rebuilt the engine. the car sounds as though it...

Hi, if the trouble code was P0455, it could be a purge valve that has failed or jammed open. This can easily happen when the vapor cannister screen fails and allows charcoal into the purge line. The charcoalcan then block the closing of the purge valve and allow purge flow during idle. Remove the purge valve and see if it's open. If it's jammed, clean it out. If there is charcoal in it, replace the vapor cannister. If the valve just doesn't close due to a broken return spring, replace the valve.
If the valve is fine, turn your attention to the parts in the back of the car. Look for a busted hose on the cannister or a crack in the cannister, but this would not explain the idle issues. Please let me know if you have questions, and thanks for using FixYa.
purge valve:


EVAP system:


Mar 29, 2011 | 2000 Pontiac Firebird

2 Answers

Push the gas and the engine wont rev past 2000 rpm. i have a 2002 ford escape 3.0L. i ran a diagnostic n it threw a p0443 code.

From: P0443 - Evaporative Emission Control System Purge Control Valve Circuit OBD-II Trouble Code Technical Description

Evaporative Emission Control System Purge Control Valve Circuit
What does that mean?

The Evaporative Emissions System (EVAP) allows fumes from the gas tank to enter the engine to be burned, rather than vented into the atmosphere as an emission. The purge valve solenoid is supplied switched battery voltage. The ECM controls the valve by operating the ground circuit, opening the purge valve at specific times allowing these gasses to enter the engine. The ECM monitors the ground circuit as well, watching for faults. When the purge solenoid isn't activated, the ECM should see a high voltage on the ground circuit. When the solenoid is activated, the ECM should see the ground voltage pulled low, close to zero. If the ECM doesn't see these expected voltages, or senses an open in the circuit, this code is set.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); on Facebook Potential Symptoms

P0443 trouble code symptoms could be just an malfunction indicator lamp (MIL) illumination. There may be no drivability problems at all. But, it's also possible to have a lean condition or a rough running engine if the purge valve is stuck open. Usually though, these symptoms are accompanied by other EVAP codes. Another symptom may be excessive pressure in the gas tank in the form of a "whooshing" sound when the cap is removed, indicating a purge valve that isn't working at all or stuck closed.

To cause a P0443, there has to be a problem with the purge control CIRCUIT, not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly. Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. That said, it could be any of the following:

  • Bad purge solenoid (internal short or open)
  • Wiring harness chafing or rubbing another component causing short or open on control circuit
  • Connector worn, broken or shorted due to water intrusion
  • Driver circuit inside powertrain control module (PCM) is bad
Possible Solutions

1. Using a scan tool, command the purge solenoid to activate. Listen or feel for a clicking coming from the purge solenoid. It should click once, or on some models it may click repeatedly.

2. If it doesn't click with scan tool activation, unplug the connector and examing the solenoid and connector for damage, water, etc. Then check for battery voltage on the feed wire with the key on. If you have battery voltage, then ground the control side manually using a jumper wire and see if the valve clicks. If it does, then you know the solenoid is working properly but there is a problem with the control circuit. If it doesn't click when you manually ground it, replace the purge solenoid.

3. To check for a problem on the control circuit (if the solenoid tests okay and you have voltage to the solenoid) plug the solenoid back in and remove the control circuit (ground) wire from the ECM connector (If you're unsure how to do this, do not attempt). With the ground wire removed from the ECM, turn the key on and then manually ground the Purge valve control wire. The solenoid should click. If it does, then you know there is no problem with the control wire to the solenoid and there is a problem with the ECM purge solenoid driver circuit in the ECM. You'll need a new ECM. However if it doesn't click, then there must be an open in the wiring between the ECM and and the solenoid. You must find it and repair it.

Mar 02, 2011 | Ford Escape Cars & Trucks

1 Answer

I have a 2005 grand prix and the OBDII light stays on i have checked the gas cap and its on tight

Hi, are you saying the trouble code is P0455, or have you not scanned the car? If you have not scanned the car, please get a free scan at you local parts chain and send us the codes.
If you have P0455, check the EVAP hose from the fuel tank to the charcoal cannister for leaks. Inspect the cannister and the hose to the purge valve. Make sure the purge valve is not stuck open.
Let me know if you have questions, and thanks for using FixYa.

Jan 21, 2011 | 2002 Pontiac Grand Prix

1 Answer

What is a purge valve on a 2000 mazda xl and where is it located?

When the car is off, gasoline vapors from the fuel tank are absorbed in a charcoal cannister. When the engine is running, vacuum from the intake is directed to the cannister through the purge valve to **** the fumes from the charcoal back into your engine. This keeps the fumes out of the atmosphere. The purge valve is a solenoid controlled by the ECU to open when it thinks the engine can take the extra air. There is a little pump that sucks on the system to check for leaks and it sets a CEL if there is one.

The purge valve is part of the EVAP emissions control. This is a common failure in Mazdas.

Hope helped.

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2 Answers

Check engine light is on. EVAP small leak detected. I checked the gas cap. What's next? This is a 2003 Ford Ranger with the 4.0 v6 engine.

You need to check the purge and vent solenoids for proper operation. You need to check the pressure sensor for out of range ( defective ). You need to check the filler neck for cracks and make sure the clamps are tight. You need to check the vapor lines for loose fit. I've seen at the charcoal cannister where the lines connect it may not be on strait. A smok test will reveal this if its not sealing. You may have a leaking rollover valve or fuel pump seal on top of the tank. You may just have a vacuum leak under the hood, These trucks have an Evap management valve also that can be leaking or out of specs. Look on the emmisions lable or vacuum chart under the hood. This will show you the underhood components.

Jul 15, 2009 | 2003 Ford Ranger Regular Cab

2 Answers

Describe your 1996 Ford Explorer Problem..trouble

Diagnostic Trouble Code (DTC) P0443 indicates a failure in the EVAP canister purge valve circuit.
Possible causes:
  • VPWR circuit open.
  • EVAP canister purge valve circuit open.
  • EVAP canister purge valve circuit shorted to PWR GND.
  • EVAP canister purge valve circuit shorted to VPWR.
  • Damaged EVAP canister purge valve.
  • Damaged PCM.

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1 Answer

Codes PO 442, 449 and 455

Check all vacuum lines from the gas tank to the evaporative charcoal cannister by the gas tank and to the purge valve located at the engine. Check the electrical connector at the vent solenoid which should be located on the charcoal cannister and purge valve solenoid by the intake manifold.

Jun 10, 2009 | 2003 Chevrolet Silverado 1500

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