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What p0440 mean in the cars - 1999 Chevrolet Blazer

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P0440 OBD-II - Evaporative Emission Control System Malfunction


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.



Symptoms:
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook 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

Hope helps (remember rated this).

Posted on Jul 05, 2010

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Posted on Jan 02, 2017

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I need to know what p0440 means


The technical meaning of the code is Evaporative Emission Control System Malfunction.

P0440 EVAP System No Flow can occur during the following conditions:
Fuel filler cap might be loose
  • Leak in the fuel tank, fuel filler neck or fuelsending unit 'O' ring.
  • PCM might have failed.
  • Purge vapor line might have clogged.
  • Purge or vent solenoid power circuit is open .
  • Fuel tank pressure sensor is damaged, disconnected or it failed.
  • Charcoal canister is filled with fuel or moisture.

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This should help explain - http://repairpal.com/OBD-II-Code-P0440

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