Having problems with your Buick LeSabre ?

I need to know what p0440 means - LeSabre Buick Cars & Trucks

Posted / edited by AnonymousUser on : 18-03-2019

Answers :

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.
  • \015\012
  • PCM might have failed.
  • \015\012
  • Purge vapor line might have clogged.
  • \015\012
  • Purge or vent solenoid power circuit is open .
  • \015\012
  • Fuel tank pressure sensor is damaged, disconnected or it failed.
  • \015\012
  • Charcoal canister is filled with fuel or moisture.
P0440 is an EVAPorative emissions code for a major EVAP leak - most common cause is a loose gas cap / bad gas cap seal. Make sure that the gas cap is fully seated, and try running the vehicle for a while - if that is the problem the light will clear itself. Other causes include a cut line, leaking charcoal canister, or leaking purge valve.
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