Question about 2001 Pontiac Grand Am SE

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Trouble codes po443 and po449

Instrament panel not working

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PO 443--Evap Purge Control Valve Circuit

PO 449---Same thing---Vent Valve/Solenoid
Circuit Malfunction

Posted on Dec 04, 2012

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I am having problems with cranking the car,it takes around 25 times to crank the car when it is cold. i am having trouble code PO449, does this have any dealings with each other. I really need some help....


This is not easy to say, but today's cars are very high tech and do-it-yourself stuff seldom results in solutions. As you have said, you have already spent a lot of money with no solution. Ask around for a good technition

Mar 20, 2011 | Oldsmobile Bravada Cars & Trucks

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I have a 2001 pontiac grand am se v6 . The service engine soon light came on and i got a free diagnostic ran and it brought up these codes; P0443, P0449, and P0141.


PO443, Evaporative Emission Control System Purge Control Valve Circuit Malfunction
PO449, Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
PO141, Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2).
I don't understand why the free diagnostic didn't come with a service recommendation?
P.S. I hope that you know when one of your headlights are out!

Aug 18, 2010 | 2001 Pontiac Grand Am SE

1 Answer

Trouble code po449 2006 chevy avalanche


CODE PO449 -EVAP VENT SYSTEM PERFORMANCE CONDITION.POSSIBLE CAUSES. VENT SOLENOID CONTROL CIRCUIT IS OPEN OR SHORTED TO GROUND OR.VENT SOLENOID CONTROL CIRCUIT IS SHORTED TO SYSTEM POWER B+.OR VENT SOLENOID POWER CIRCUIT IS OPEN TEST THE ENG 1 FUSE.OR VENT SOLENOID IS DAMAGE OR HAS FAILED.OR PCM HAS FAILED.

Aug 19, 2009 | 2003 Chevrolet Silverado 1500

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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.

Jul 10, 2009 | 1996 Ford Explorer

1 Answer

PO410, PO443, PO449 codes 1999 chevy malibu. what type of repair?


The first code is for the secondary air injection system. It could be as simple as a fuse or broken wire. It could also be the air pump. The second is the purge solenoid control circuit. Again it could be a wire or the solenoid. The third is also a EVAP code related to the vent valve, and may also be the wiring or the valve. Did all these codes set at the same time? If so you may be looking at a PCM problem. It is really hard to venture a guess at the cost without lnowing more. I advise you to use a good shop that you trust. It will take some special equiptment to properly diagnose these issues. Good Luck

Jun 24, 2009 | 1999 Chevrolet Malibu

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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