Question about 2003 Chevrolet Cavalier

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Engine check light just came on....neighbor hooked some gadget up and it came back with code P0440. What is it and is it dangerous. Will I get stranded???

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The code is pretty standard and has to do with emissions. Manufacturers these days have strict rules to emissions that the car puts out. So, this code relates to that. It is Evaporative Emission Control System Malfunction 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

P0440 EVAP System No Flow During Purge Possible Causes Setting Conditions
  • Charcoal canister is loaded with fuel or moisture
  • Fuel filler cap is loose, cross-threaded, damaged or wrong part
  • Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
  • Fuel tank pressure sensor is damaged, disconnected or it failed
  • Fuel tank vapor line(s) is clogged, damaged or disconnected
  • Purge valve vapor line is clogged, damaged, or disconnected
  • Purge or vent solenoid power circuit is open (check the fuse)
  • PCM has failed
So, basically if you drove around with the gas cap off, or something else has happened, then this code would come up.

I would disconnect battery for 1 minute, and reconnect and see if the warning light comes back on.

Just remember you might lose your radio code if you do this.

Let me know how it goes...
PLease vote if you liked this response.

Posted on Jul 16, 2010

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