Question about 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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Posted on Jan 02, 2017
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
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
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
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
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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