Question about 1999 Buick Century

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Small evap leak

Put new gas cap on, but check engine light is still on.

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  • Buick Master
  • 21,873 Answers

Depending on which code you have in the computer, the problem could be one of the hoses going to the vapor canister, one of the valves, or the seal around the fuel pump assembly on top of the tank.

Posted on Jan 07, 2013

  • logos08
    logos08 Jan 07, 2013

    Could be one of the "valves"? Would that be expensive to fix?

  •  Stephen
    Stephen Jan 07, 2013

    It would depend on which valve. I think there are at least 3 involved. Average price is probably $25 each plus labor.

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  • 2 Answers

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Posted on Jan 02, 2017

bschilz
  • 2049 Answers

SOURCE: code p0449.

GM uses an EVAP solenoid that is located under most vehicles near the gas tank and connects to the charcoal filter can. Codes can be set and will drive you crazy trying to figure out if you have a bad gas cap, broke lines---this is where they try to get you to do a smoke test, or you just think the vehicle is no good! Relax, it is usually an easy fix and one GM has known about for years but continues to make easy money off people who cannot do basic maintenance. Now one code that comes up is usually P0449, along with maybe a warning to check the gas cap to see if it is on tight! GM will gladly read this code out for you for around $98.00 and then fix it for another around $100.00 which includes the EVAP part which if you buy at their parts dept. will cost you $32.00 and my dealership parts man told me they sell one a day! It is easy money for them and obviously a defective part they keep using for the last 10 or 15 years but hey, its money in their pocket. Here is how to fix it with ONE single common screwdriver! Get under the vehicle after putting on the parking brake. The EVAP solenoid is easy to spot near the gas tank and it has one electric connector which disconnects by releasing the plastic clip and pulling the connector out. It also has ONE air line connected which goes to the charcoal cannister which also can be removed with the one screwdriver. The whole EVAP solenoid and air can can be removed with the screwdriver which makes it easier to unplug the electric and air line. Get a replacement from the dealer as they certainly are familiar with this part as they sell LOTS of them. Then just go under and plug the new one in and the problem is solved. Now if you do not have a tool to reset the codes, try the local parts places as most of them will do a reset for you.

Posted on Jan 24, 2010

Testimonial: "thanks alot.i appreciate all your help .the explanation was very good.gonna go by dealer to get the part.ill let u know how it turned out."

  • 1 Answer

SOURCE: check engine soon light. diagnosed as troble shooting codepo44

Change the evap vent solenoid canister located near the master cylinder on the right side of the engine or your hoses may be cracked. Good luck!

Posted on Mar 12, 2009

  • 17 Answers

SOURCE: 2 po442 codes showing up on my 2003 buick century

If there was a leak at the gas cap. EG: Left off or loose after fill up? You will need to have the codes cleared or it will clear itself after enough key cycles. EG: Started and shut back off as many as 20 to 50 or more times.

Posted on Jun 01, 2009

  • 1168 Answers

SOURCE: Check Engine light on my 2004 Chevrolet Aveo

Hello Reina.
It isn't going to hurt anything unless your fuel tank is leaking fuel. In which case you should get it fixed.
It could be a fuel cap and if it seems loose or worn you should replace it anyway. It may cure the problem.
It may take a while for the light to turn off though, as it will need to run the test and pass before it goes out.
If you need more help, leave a message and I will return to assist.

KL

Posted on Jan 24, 2010

Testimonial: "If it is my fuel tank leaking, how would I know. Would I smell gas?"

  • 1796 Answers

SOURCE: 2004 Buick Raineer check engine light on; gas cap

Hi!!

Check engine light comes on when the computer detects a malfunction in the emision control system, could be a loose or broken vacumm line, loose gas cap or a sensor.

Drive your vehicle to an AutoZone store, ask them to retreive the trouble codes from your computer memory, they will do that and a print out of the codes and their meaning. This a free service they provide for their customers.

Don't forget to rate this answer. Good Luck

Posted on Apr 27, 2010

Testimonial: "Thanks for quick and pin point reply that will save me money. I already had replaced gas cap from a previous episode."

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1 Answer

Location for 2006 buick rainier EVAP purge solenoid


You should have an EVAP leak test done . It could be a leaking purge valve , you could need a new gas cap as well or it could be the fuel filler neck . or assorted hoses or the fuel tank pressure sensor . If the check engine light is lit there will be a code .
DTC P0442: Evaporative Emissions (EVAP) System Small Leak Detected or
DTC P0455: Evaporative Emission (EVAP) System Large Leak
DTC P0446: Evaporative Emissions (EVAP) Vent System Performance
You have to jack up the vehicle , the purge valve is attached to the engine behind the A/C compressor .

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could be your oxygen sensor or catalytic converter.. You may check for leaks in manifold as well.Mass air sensor could also be at fault.

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Dodge ram gas cap light and check engine light on at the same time p0456 and p0457


456 is a small evap leak check hoses to evap canister by fuel tank.

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P0456 error code on a 2003 Mits. Galant


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

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My check engine light came on and it is a p0442 EVAP SYS, small leak


Evaporative Emission Control System Leak Detected (small leak)
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.

Causes: A 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

Possible Solutions: 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


Keep us updated.

Dec 13, 2010 | 2004 Saturn VUE

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Location of sensor for troubleshooting po442 to cause check engine light to come on


P0442 OBD-II Trouble Code - Evaporative Emission Control System Leak Detected (small leak)

What does that mean?
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.


Symptoms
You likely won't notice any drivability problems.


Causes
A 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


Possible Solutions
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


46b629a.jpg

Fig. EVAP vent solenoid (2) on 3.1L, 3.4L, 3.5L & 3.8L, showing the connector (1) and vapor line (2)


510065b.jpg

Fig. EVAP canister purge solenoid location on 3.1L & 3.4L


a193655.jpg

Fig. EVAP purge solenoid valve (3) location on 3.5L




Hope this help, good luck.

May 11, 2010 | 2002 Buick Century

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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

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2000 cavalier check engine light code po440


P0440 - Evaporative Emission (EVAP) System


evaporative emission (EVAP) system has a large leak.
Check the gas cap or vent valve. these are the most common problems.


The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the Fuel tank pressure sensor (FTP). When the sensor indicates a small leak in the EVAP system, this code is set.


Here are some additional causes.

* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking

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2001 Dodge Caravan/check engine light


P0442--Evap Emission Sys. leak detected small leak
P0455--Evap Emission sys. leak detected gross leak
P0456--Evap Emission Sys. leak detected very small leak

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