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Trouble codes PO440 and PO452

Fuel gauge not working properly. Several codes present. Replaced fuel pump asembly, cleared codes, drove for several days (short trips) these two codes returned

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  • David Brown Oct 15, 2012

    Found broken vacume port on evap cannister. Repaired port, cleared DTCs, no codes returned. Thanks



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Posted on Oct 07, 2012


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Posted on Jan 02, 2017



SOURCE: o2 lincoln ls check engine

You have two pumps,I guess you know that ,if you already did one. Did you check fuel pressure at the rail and check out the electronic pressure regulator? What codes are coming up and do they stay set?

Posted on Feb 09, 2010

Testimonial: "when i saw expert service i kinda laughed just another rip off but the guy knew his stuff very helpfull "


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SOURCE: 2002 Accent Fuel Pump problems

I think that the 2002 accents still have a external fuel pump i would change that but to be shue it is a fuel problem remove the fuel line from the fuel rail and cycle the key on and off checking to see that there is no fuel spurting out of the line. New fuel pumps aer extremly quiet

Posted on Oct 18, 2008


  • 218 Answers

SOURCE: 2002 Ford Taurus 3.0 liter trouble


Posted on May 01, 2009


  • 77 Answers

SOURCE: engine quits and won't restart

Sounds like a bad cell(s) in your battery. They will not hold a charge very well if they have been damaged or sometimes at all. Your charging system is probably running the engine most of the time which gives little room for charging the battery, and when it sits the little bit of charge is now just enough or not enough to get you going. If you can, try having the battery load tested (usually free) and also have a mechanic take a look at your alternator while your there. I think your alternator could be dying which is how you got a weak start from the battery if it turns out that the battery is ok.

Posted on May 04, 2009

Ted Schore

  • 7353 Answers

SOURCE: po452 trouble code changed sensor engine light

you may have to drive it several days for the light to go off, or have the codes cleared. personally I would just drive it. if the computer tests it, and it passes the test, it will go off on its own.

Posted on Sep 21, 2009

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2 Answers

How to fix po440 trouble code

do the easiest cause first... did you recently get gasoline and didn't put the fuel cap back on correctly?

CLEAR the trouble code and re-seat the gas cap properly & then see if the check engine lights up with the same code... then go from there

i've embedded gbob59s link because it should have worked the first time

Apr 10, 2015 | 1997 Volkswagen Cabrio

1 Answer

Code po452 on 2005 dodge stratus

po452 indicates an issue with the nvld valve. it is located above the fuel tank, in order to test this you will need a hand vaccum pump, and and a multimeter if you look at the canister there will be a standard vaccum line and a vent tube wich will be larger, the vent tube needs to be blocked off, and the vaccum pump will need to be hooked up to the vaccum line. Next the meter will need to be inserted into the harness coming from the switch (orange wire).(''t''pins from wal mart sewing department may be helpful here). Keep the harness hooked up key on engine off, when vaccum is applied (about 1 hg on the gauge) the voltage should start at 12 volts and drop to 0 volts if operating correctly ,test it several times, the most common fix is to replace the whole assembly, it includes the charcoal canister, and requires removal of the fuel tank, hope this helps chris.

Jun 23, 2014 | 2005 Dodge Stratus

2 Answers

Why isnt my engine getting enough fuel to run?

Many times you need to prime it. You didn't say if it was an electric fuel pump or a manual. For a manual, pump the gas pedal several times, have someone watch for when gas mist gets to the carb. If electric pump, turn the key on and let wait until the pump quiets down. For an inline filter, we used to pour a few drops of gas into the filter, then install it properly. You can also prime the carburetor.

You just aren't getting the gas back up to the carb, that's all.

Apr 27, 2014 | 2001 Mitsubishi Galant

2 Answers

Why it has trouble starting the first time every day, but works fine later, and runs good

If it only gives trouble after standing unused for several hours, I would suspect the gas lines, possibly. After sitting for several hours, if your gas lines are already gunked up, then it's difficult to get the fuel to the engine after sitting for several hours. Once you use it, and warm it up, then it's not as difficult getting fuel through gunked up lines. Just a possibility.

Jun 04, 2013 | 1995 Jeep Grand Cherokee

1 Answer

My 1997 monte carlo starts up fine and then shuts off do u know what that could be

Make the FixYa experience better for everyone by voting.
Check the entire fuel delivery system.
  • Relieve system pressure. Disconnect the negative battery cable and loosen the gas cap to let pressure drain from the system. Attach a dual tube pressure gauge to the test port and drain fuel into an approved container.
  • Disconnect the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.
  • Twist off the fuel pressure test port cap and attach a pressure gauge to the fuel pressure valve if one is not already connected. Reconnect the negative battery cable and turn the key to the first position. Do not start the engine.
  • Check the pressure gauge. It needs to register between 45 and 48 psi. Start the engine and let it idle. Check the gauge again. It needs to register approximately 46 psi. Leave the engine on and remove the vacuum hose. Check the gauge one last time. It needs to register approximately 50 psi. Pressure that's too high indicates a malfunctioning pressure regulator. Low pressure indicates a clogged fuel filter or a broken fuel pump that needs to be replaced.
  • Cut the engine off, relieve system pressure again and remove the negative battery cable.
  • Clean the fuel filter inlet with compressed air to remove any dirt that might come loose and contaminate the fuel supply as you remove the fuel filter. Pull the filter out at the male filter fitting and disconnect the remaining connections to the filter. Remove the filter.
  • Examine the filter for clogs and replace it if necessary. If there are no clogs, the fuel delivery problem is probably caused by a breakdown in the fuel pump itself.
DO NOT RUN OUT AND BUY ANYTHING YET! This was only the opening act.

All of the above systems are monitored by GM Powertrain Module (a.k.a. on-board computer). A diagnostic scan retrieves any inform related to the malfunctioning parts and tells you precisely what is wrong. Perform the scan diagnostic now.
Start the car and perform another scan. The reason we rescan and repair non-related codes after the engine is running is because sometime false codes can be triggered by the engine not running. Once the engine is running again the code present might cycle and turn itself off. You might say "if the engine doesn't run shouldn't it have a trouble code?" Sometimes conditions occur that will not be detected by the computer, e.g.,if the fuel pump fails the computer cannot detect the failure, so the engine doesn't start and the computer thinks everything is okay with no codes. If no trouble codes are present proceed to the next step.
If you have trouble using the code scanner or interpreting the codes click on the following link and use my access code (carrepair): Free Automotive Repair information for Users of a Code Scanner
I know that the above is wordy but I wanted to do more than just tell you that your problem is complex.
All the best,

Nov 13, 2011 | 1997 Chevrolet Monte Carlo

1 Answer

Engine codes po452, po440,po122. electrical problem?

You should have 3 grounds 1 from the battery to the engine one from the engine to the body and then from the engine to the frame. Look for these grounds they look like braided flat wire. I think you also may have a loose plug or a cut in the main harness from the rear of the vehicle. Look along the frame as the harness runs from back to front. Looking at your codes I do not think they are related to your electrical problem. I gave up trying to fix my gear indicator, I had to replace the fuel tank sensor to get my gas gage working right.

May 18, 2010 | 1998 Chevrolet Blazer

3 Answers

Po452 trouble code changed sensor engine light

you might try unhooking the battiey for 20min both + and - posties cuz that will force the computor to have to resest only if you have addressied the fuel pressure problem which taht would most likly be your filter which isn't all that much

Sep 21, 2009 | 2000 Chevrolet Silverado

1 Answer

1997 s-10 sames to get vapor lock. after filling up with gas,drove truck home (4miles} left sitting in drive way (hot sun) tried to start 4:pm. 9:pm 9:am removed gas cap started up first time. Aprox....

Change your fuel filter, it may have gone it's life time and is getting to dirty to let fuel flow properly. Your fuel pump to may be getting weak, if the fuel filter is dirty the pump works harder and heats up and could be over heating the fuel pump relay too. The fuel pump relay i believe is in the glove box behind a panel that say relay, there should be (3) in there and the middle one is the fuel pump's. switch then around after you change the fuel filter and if you get a chance, check your fuel pressure at the shredder valve. Good luck and hope this help's if there is a Auto Zone around you, you can ask to use the fuel pressure gauge to see what fuel pressure you have and they'll have the step by step instructions on how to do it and takes about 5 min to do and will have the fuel filter and step by step to replace that too. Keep me posted, be glad to help.

Jun 08, 2009 | 1997 Chevrolet S-10 Pickup

2 Answers

1988 Ford F350 won't start

U will need to get the fuel pressure checked to confirm it is or isn't the problem, there is no substitute for proper testing work if u want to repair the truck in a min of time and a min of money spent on un-needed parts.

May 26, 2009 | 1988 Ford F 350

1 Answer

Wont start

hello,for this problem sop to install a fuel gauge,to determine your fuel pump motor is working(fuel pressure) or fuel filter is not clog,we have a report a case which diaphragm pressure regulator is leaking this is only in fuel side,try to start your engine,remove 1 spare plug to determine that you have a ignition,if not send to your dealer,ty

Apr 26, 2009 | 1997 Mercedes-Benz Mercedes Benz S Class...

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