1999 BUICK LESABRE P0440

  • Tiny
  • khubbard5
  • 1999 Buick Lesabre

Engine Mechanical problem
1999 Buick Lesabre 6 cyl Front Wheel Drive Automatic 128000 miles

My check engine light came on. I just changed my plugs and wires and the light turned off. Now it is on and the scanner gives a reading that says: P0440 EVAP Control System Malfunction. What does this mean?

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Saturday, November 29th, 2008 AT 7:31 PM

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  • Tiny
  • rasmataz
  • Member

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 SolutionsWith 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

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Saturday, November 29th, 2008 AT 7:51 PM
  • Tiny
  • khubbard5
  • Member

Thanks for the feedback.I will do the gas cap deal today. But if that doesn't work how do I find all those other things you talked about.

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Monday, December 1st, 2008 AT 8:41 AM

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