1999 CHEVY SILVERADO TROUBLE CODE P0440

  • Tiny
  • la ganza
  • 1999 Chevrolet Silverado

Engine Mechanical problem
1999 Chevy Silverado V8 Four Wheel Drive Automatic

Hi I have 99 chevy silverado 4x4 auto V8 I need to know how to fix trouble code P0440 any idea? Thanks

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Friday, February 27th, 2009 AT 11:09 PM

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  • Tiny
  • rasmataz
  • Member

You got a lot of vehicles that we have helped you sounds like a sideline job

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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Friday, February 27th, 2009 AT 11:21 PM

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