Question about 2004 Pontiac Grand Prix

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P0544 Code and problems with my Mechanics!

I took my car (2004 Pontiac grand prix) into a shop because I had a P0455 code. I had already had my gas cap checked and they said it was fine. they did a smoke test and told me that it was the a "gross leak in the evap emission canister purge solenoid" so I paid them $100 to fix it. Three days later the light came on again so i took it back and they did another smoke test and told me it was the same thing. So I said "I thought you fixed it?" and they said they fixed the one in the back. now the one in the front needs fixing. So I have two questions. 1) are they full of crap and just giving me the run around? 2) where is it "front" purge solenoid located, what does it look like (link a website with a picture) and can I fix it myself (without tearing the car apart)?

Posted by Anonymous on

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  • Pontiac Master
  • 11,492 Answers

There is no code P0544 , maybe you mean P0455 ?
The control module tests the evaporative emission (EVAP) system for a large leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the control module commands the EVAP canister purge solenoid valve OPEN and the EVAP canister vent solenoid valve CLOSED . This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge solenoid valve closed, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum level. If the system is unable to achieve the calibrated vacuum level, or if the vacuum level decreases too rapidly, this DTC sets.

It's called EVAP purge solenoid , the front one . An your Mechanic is probably not full of it . You need to know how the system works . If the computer set's a code for that system , it will not test it again till it's fixed an sometime other problems come up . After he fixed the first problem he should have told you that after a day or two or a couple of key cycles , starting the car cold till warm an a cold start again , sitting over night , 8 hours . Then the computer will retest the system . An other codes may set . Before putting blame , you should have to read about OBD 2 emissions , before being able to have a vehicle .

Posted on Mar 20, 2017

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Check Engine Light - Code numbers P1486 & P0455

Found on my jeep that the high quality vac line to the evap bottle had split on the under side.

Posted on Sep 03, 2008

  • 275 Answers

SOURCE: 2004 Pontiac Grand Prix Evaporative Canister

you should be able to fix it look for a can near the fuel tank that has vacuum hoses coming out of it and you should be able to just buy the bad solenoid

Posted on Nov 03, 2008

  • 104 Answers

SOURCE: p0441

i would have the front vacuume switching vavle checked

Posted on Apr 18, 2009

emissionwiz
  • 75822 Answers

SOURCE: code p0455 evap emission (large)

have the gas cap tested or just replace it, then disconnect the battery for 5 minutes to reset the code, then drive it for a few miles and see if problem comes back, if it does a trip to the dealer is in order, as this may be covered by your emission warranty which is good for 70,000 miles.

Posted on May 26, 2009

Molson02536
  • 3854 Answers

SOURCE: p0455 comes back on ,we try to fix it

The EVAP control sytem is checked by the ECM upon the first start of the day when the engine is cool and will trigger the DTC code P0445. If you have a vacuum line leak when it's cold and seals it self when it warms up then the code will stay there. After warming up the car reset the ECM to clear any DTC codes and see if any MILL shows up. IF not then there is a leak only when the system is cold so your going to have to try to do a smoke test when the system is cold.
The other thing is to check all the vacuum lines and fittings around the canister and fuel tank for any lose clamps ECT.
Good luck and keep me posted. Be glad to help you 

Posted on Jun 01, 2009

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1 Answer

Code P0455 engine light on


Gross Leak (Big) in Evap System

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Oct 09, 2012 | 2005 Pontiac Grand Prix

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Code 0455 on a 2004 grand prix


P0455 - Evaporative Emission Control (fuel vapor control) System Leak Detected Gross Leak

Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking Tech notes The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.

Oct 02, 2012 | 2004 Pontiac Grand Prix

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What is code PO496 and PO455 for a 2007 Pontiac Grand Prix mean


P0496 is not alisted code.
P0455 - Evaporative Emission Control System Leak Detected Gross Leak (fuel vapors)
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors Possible causes - Missing or loose fuel cap
- Incorrect fuel filler cap used
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- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
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Jan 24, 2012 | 2007 Pontiac Grand Prix GXP Sedan

1 Answer

Does the check engine light come on in a 2003 grand prix if the gas cap is not on tight enough? Mine came on right after I got gas and I am hoping this is the case.


Yes, if the gas cap is not on tight enough or if you took the cap off with the engine running, this could very well be the problem. It will usually set one or more of the following fault codes: P0441, P0442, P0455, or P0456. I usually do not recommend getting the "free" scanning done at the local parts dealer, but this is one case where I would actually recommend it. Have them scan your OBD system. If one of the codes above are present, just ask them to clear the codes for you. Make sure your fuel cap is tight and see if the light comes back on (if it does, then you will need to diagnose to find out why). If there are any codes other than those listed above, then you should get your vehicle diagnosed to find the cause of the code or codes.

Please also review the following articles:
Why Is My Engine Light On?

What Else Could Be Wrong?

Sep 22, 2011 | 2003 Pontiac Grand Prix

1 Answer

2004 Grand Prix GT gas cap light,an engine light is on. Took it to autozone an code read po445 replaced gas cap, an light is still on. is there a time limit on light going out if i jus replaced it? Or what...


P0445 - Evaporative Emission Control System Purge Control Valve Circuit Shorted is located in the engine compartment and is most likely the root of the problem.Would check the plug and wiring going to this to verify that no plug or wiring damaged has occurred.It is quite possible the part has gone bad.

Apr 26, 2011 | 2004 Pontiac Grand Prix

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

Check engine light came on along with check gas cap


Did u have engine codes scanned? If not, have it done, as it may indicate the problem. Let me know. (most parts stores will scan for codes free) .

Mar 21, 2009 | 2004 Pontiac Grand Prix

2 Answers

2004 Pontiac Grand Prix Engine Problem


i think it sounds like a MAP sensor... try it if u havent figured it out already yet...

http://www.autozone.com/R,868181/vehicleId,2915702/initialAction,partProductDetail/store,713/partType,00127/shopping/partProductDetail.htm

Sep 15, 2008 | 2004 Pontiac Grand Prix

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