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My 2002 has the code PO440? What's that for? - Tahoe Chevrolet Cars & Trucks

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Code P0440, What does that mean?

This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. 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.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Symptoms

You likely won't notice any drivability problems.
Causes

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

Posted on Sep 28, 2010

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SOURCE: service engine soon code po440 2002 chevy trailblazer

http://www.fixya.com/support/r4161093-trouble_codes_vechiles If you like the info please rate.

Posted on Apr 17, 2010

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1 Answer

Where should I start to find the reason why code PO440


Sounding like a vacuum leak or some other leak in the fuel delivery system! Maybe there's a problem with your gas cap?

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The computer vents the gas tank to the vapor canister while you are driving. It checks the components by pressurizing the system to check for leaks.
The problem could be the gas cap or another component.

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It's the purge canister valve valve dealer item only and is in front of the gas tank and is a easy fix. after installing it tyrn the key to run then off 5 times in 10 seconds and it should clear the code. Please rate if this was helpful.

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