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How do I reset my check engine light on my 2002 buick century

The trouble code was p0440 and that could be that the gas cap was loose. Now I need to get the "check engine light" to turn off

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6 Suggested Answers

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Posted on Jan 02, 2017

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maygemini
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SOURCE: Check engine light on. Code P0440.

wow thermostat >>>> shucks i believe its evep emissions code like faulty gas cap ....you can reset any computer the chck eng light will come on in 50 to 100 miles if not fixed....

Posted on May 08, 2009

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  • 3 Answers

SOURCE: 2004 Buick LaSabre engine service light is on and dealer and autozone says it is a loose gas cap but it is not loose. What do I do?

The cap might need a pressure check. Just because it stays on and tight doesn't mean it is functioning properly. It must meet EPA standards to function properly. Your cap is special part of your emission system and if it is not working properly you will need to replace it and have the light reset. If you owed a code reader it would tell you the same. Auto zone does do free code reading. The check engine light usually is not a big problem,but... I will leave it at that. 

Posted on Jun 01, 2009

Molson02536
  • 3854 Answers

SOURCE: code p0440

P0440 is a EVAP leak detected, try changing the gas cap and reseting the ECM to clear the service engine light. If you can not clear the code it takes about three start up with out any issues to clear the code and after 100 start up's the codes will clear from the ECM's history. Note use the GM OEM gas cap for a replacement, anything else is just garbage and you'll be replacing it again with in 6 months. If it's not the gas cap, need to take it to a garage and have them do a smoke test to locate the leak in the system. Good luck and hope this helps, keep me posted. be glad to help

Posted on Jun 08, 2009

digritz
  • 530 Answers

SOURCE: 2002 Buick Century, when the tank is 1/4 full,

P0446 Evaporative Emission Control System Vent Control Circuit Malfunction

The evaporative emission control system checks to make sure there are no leaks in the lines that run from the gas tank to the charcoal canister and up to the engine. It also checks to make sure the gas cap is sealing correctly.
It may just be that the cap was not on tight and the code was tripped.

A dusty environment can also clog the vent line and cause this code.
Have the code cleared and see if it comes back. Some auto parts stores like Auto Zone can read and clear the codes for you.
Hope this helps.

Posted on Sep 02, 2009

  • 1608 Answers

SOURCE: 2002 buick lesabre check engine light on. need a

It would be better if you got the codes read and then post back with the code.There are numerous codes that can cause the check engine light to go on.Auto Zone will do this for free.There are a few other parts stores that do this for free also.Hope this helps.Good luck.

Posted on Mar 15, 2010

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3 Answers

Error code 0440 on a 2002 buick custom


Go to an auto parts store and get a Haynes repair manual for car it will have the code meanings for any and all codes on that vehicle. Only bad thing is the book cost around $30 maybe you will get lucky and one will be open and you could take a peak inside.

Mar 23, 2015 | 2002 Buick Century

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How to reset Service Engine Soon light after replacing gas cap? Took to AutoZone when the Service Engine Soon light came on Error code P0440.


Disconnect the negative battery cable for 30 minutes. Reconnect after and the code will clear. However if the problem persists, the code will come back with in 20 miles or 30 minutes.

Aug 02, 2014 | 2000 Buick Regal LS

1 Answer

I have check engin with code P0440


"Evap system malfunction, large leak". Gas cap is off or leaking, or vent line is disconnected or leaking, or charcoal canister is damaged and leaking, something closely related to that.

Jul 30, 2014 | Cars & Trucks

1 Answer

What does the code p0440 mean on a engine test?


That is the code for Evaporative Emission Control System.You have a fuel vapor leak check your gas cap it maybe loose causing this code.

Apr 19, 2011 | 1998 Buick Century

1 Answer

I am getting P0440 EVAP Control System Malfunction for my Buick Century 1999 and need to know how to fix it thanks


A code P0440 could mean one or more of the following has happened:
  • The gas cap is not installed or working properly
  • The purge solenoid has failed
  • The canister is plugged and not working properly

Possible Solutions: with a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
  • Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
  • Inspect the EVAP system for cuts/holes in tubes/hoses
  • Inspect for damaged or disconnected hoses around the Evap purge solenoid
  • Check and/or replace the sensor
  • Check and/or replace the purge valve
  • Have a professional use a smoke machine to detect leaks

Keep us updated.

Nov 15, 2010 | 1999 Buick Century

2 Answers

2002 Buick Century, when the tank is 1/4 full,


P0446 Evaporative Emission Control System Vent Control Circuit Malfunction

The evaporative emission control system checks to make sure there are no leaks in the lines that run from the gas tank to the charcoal canister and up to the engine. It also checks to make sure the gas cap is sealing correctly.
It may just be that the cap was not on tight and the code was tripped.

A dusty environment can also clog the vent line and cause this code.
Have the code cleared and see if it comes back. Some auto parts stores like Auto Zone can read and clear the codes for you.
Hope this helps.

Sep 02, 2009 | 2002 Buick Century

1 Answer

Code p0440


P0440 is a EVAP leak detected, try changing the gas cap and reseting the ECM to clear the service engine light. If you can not clear the code it takes about three start up with out any issues to clear the code and after 100 start up's the codes will clear from the ECM's history. Note use the GM OEM gas cap for a replacement, anything else is just garbage and you'll be replacing it again with in 6 months. If it's not the gas cap, need to take it to a garage and have them do a smoke test to locate the leak in the system. Good luck and hope this helps, keep me posted. be glad to help

Jun 08, 2009 | 1998 Buick Century

2 Answers

Check engine light on. Code P0440.


wow thermostat >>>> shucks i believe its evep emissions code like faulty gas cap ....you can reset any computer the chck eng light will come on in 50 to 100 miles if not fixed....

May 07, 2009 | 2001 Buick Regal

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