Question about 1998 Buick Regal

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My cars service vehicle light is on, replaced gas cap, it was a vacuum error code. Where do I start looking for a vacuum leak?

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Lots here
try the filler neck to see if there are rust spots, then try gas lines, also could be the evap canister, then there are more.....
but start with those, they are the easiest

Posted on Jun 17, 2009

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Computer code 455


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 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.

When is the code detected? EVAP control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors P0455 Buick Description This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition. The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
if tightening the cap or replacing the cap does not help take your car to a shop to have it diagnosed as it requires special tools/equipment to test this and get an accurate results to find what needs replacing.

Oct 10, 2014 | 2004 Buick LeSabre

1 Answer

Check engine light on codes p0442 p0456 p0513


P0442 and P0456 are both evaporative emission error codes due to a small leak. The most common cause is a leaking gas cap or hose leak on that system. I did not list a code for your 0513. I am sending you a little information about your problem.. Best of Luck to you..


2003 Lexus RX300 3.0L 2003 Toyota Sienna 3.0L 2003 Toyota Highlander 3.0L, Eng Cfg V6, Eng Des 1MZFE, USA/Canada 2004 Toyota Avalon XL 3.0L
Check engine light is on with trouble codes P0442 and P0456. The codes are evaporative system small leak codes.
1. Verify that the gas cap is a factory Toyota gas cap and visually inspect that all hoses and lines are tight and connected.

2. Locate the canister closed solenoid and the vacuum switching valve on the canister. Manually ground them and verify that they operate and function. The canister closed solenoid is normally open and should close when grounded. The vacuum switching valve on the canister is normally closed and needs to open when grounded.

3. Verify that the hoses are not loose or pulled off the canister closed valve on the air cleaner housing. This has been a common problem on some models.

4. If no problem is found, the next step is to ground the canister closed solenoid and the vacuum switching valve under the vehicle and simulate an evaporative test and verify that the system holds a vacuum and functions normally. When the solenoids are grounded, back probe the Blue/Black (L/B) wire on the pressure sensor, and with no vacuum or pressure, the voltage should read around 3.3 volts. Start up the vehicle and turn on the purge vacuum switching valve and use engine vacuum to draw down the system to around 2 volts on the pressure sensor. If the voltage does not increase rapidly, there is no problem. If the voltage increases quickly, look for the leak in the evaporative system. Potential Causes: Canister Closed Valve
Disconnected Canister Closed Valve (CCV) Hose
Gas Cap
Harness
Vacuum Switching Valve - For the pressure sensor.

Aug 21, 2011 | 2002 Lexus ES 300

1 Answer

My check engine light came on had it check at autozone they said i have bad gas cap or evap canister or small leak in vacuum line


I hope they reset the code for you.
Most times when that code occurs it's because the gas cap wasn't put back properly when you got gas.
If they didn't reset it take it back and ask them to reset the code.
If it doesn't come back you know it was a loose gap cap that tripped. If it does then you need to start looking closer. 1st make sure the cap seats well and seal the filler tube. If not replace it.
A small vacuum leak can be difficult to find but you should start by examining the vacuum hoses for cracks ESPECIALLY where connect to their fittings. If cracks are found just cut the end off and reinstall the hose.

May 16, 2011 | Pontiac Grand Prix Cars & Trucks

2 Answers

Service engine Diagnosis Code PO455 Transmission revs up


Hi, the code indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

p0455 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system


With a p0455, the most common repair is to:

  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

Mar 05, 2011 | 1999 Ford Taurus

3 Answers

P0456 error code on a 2003 Mits. Galant


P0456 = "Evaporative emission (EVAP) control system leak detected (very small leak)."

Feb 25, 2011 | Mitsubishi Galant Cars & Trucks

3 Answers

I have 2000 chevy impala 3.4 engine i have check engine light with this code p0442 took it it to auto zone they said it was a small leak dont know where to start


This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
code P0442 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • A small leak/hole in a fuel vapor hose/tube
  • Other small leak in EVAP system
  • Faulty vent o-ring seal
With a P0442, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, or
  • Inspect the EVAP system for cuts/holes in tubes/hoses

Dec 31, 2009 | Chevrolet Impala Cars & Trucks

1 Answer

I have Pontiac Grand AM 2001 2.4L I Need Vacuum Diagram The Code PO440 Vacuum Leak E-Mail izzyr358@msn.com


Lets keep it simple and start with replacing the gas cap first. Don't buy the cheap generic gas cap, buy the OEM dealer gas cap for your car. Your car is 8 years old and the seals in the gas cap get brittle and have cracks, Next time you fill up your gas tank, look at the gas cap and inspect the condition of the seals. Start with that and make sure that when you reinstall the gas cap that it's tight, you want to hear it click three times to insure that it's tight. Good luck and keep me posted, the service light will go off on it's own after the issue has been addressed after 3 start ups and will clear it self from the history after 100 start ups without any issues. Good luck and be glad to answer any questions you may have. 

Jul 21, 2009 | 2001 Pontiac Grand Am SE

1 Answer

2002 Chrysler Town & Country Evaporator leak error code keeps popping up. Does not appear to be loose gas cap


THERE ARE SEVERAL EVAP HOSE LEAK SPOTS ON THESE VEHICLES..UNDER VEHICLE BY EVAP CANISTER,UNDER AIR CLEANER..ALSO LDP VENT VALVE NOT HOLDING VACUUM WILL SET A LEAK CODE..SMALL BLACK VALVE WITH A HOSE ON EACH END WITH A SMALL VACUUM HOSE ON TOP..IT SHOULD HOLD VACUUM WITH HAND HELD VACUUM PUMP..HAVE ALSO SEEN SPLIT HOSES NEAR EVAP SERVICE PORT LOCATED NEXT TO AIR CLEANER HOUSING

Jul 02, 2009 | Chrysler Town & Country Cars & Trucks

4 Answers

Check engine light on dash. replaced gas cap with new one, several trips still light is on. Neighbor use dianostic tool code is P 0441


have a 2003 dakota v6 and was informed by a friend that works at a dealer of issue concernig this . reciently my check engine light came on and was told when codes where checked to look under drivers side of truck along frame to the charcoal box . the center hose that goes into the box has a tendancy to crack at the end going into the box cut about an inch off of the hose if able to do so heat the hose up with a head gun or other means reconect the hose and disconnect the battery for about 10 min for computer to reset and wait if after a week light dosent come on your fixed if it dose your screwed

Sep 02, 2008 | 2003 Dodge Dakota Club Cab

1 Answer

96 corsica error cod po441 no purge flow


Look, that code means:
P0441 - Evap emission control system Incorrect purge flow

so try to replace the emission control.

Jun 15, 2008 | 1996 Chevrolet Corsica

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