Question about 1996 Pontiac Grand Am

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Ch. engine code P0440

Replaced gas tank filler tube, light went off for about 3 months,
light came back on with the same code

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  • Anonymous Mar 24, 2014

    replace gas filler tube



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Try replacing the gas cap

Posted on Nov 08, 2008


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Posted on Jan 02, 2017


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P0440 - Evaporative Emission Control System Malfunction
Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking Tech notes Loose fuel tank filler cap is the most common cause that triggers the P0440 code.

Sep 17, 2012 | 2002 Pontiac Grand Prix

3 Answers

In the solution for the po440 code on the 2001 toyota camry ce, what's a filler cap?

The filler cap is the GAS CAP. This code will come on if you forgot to tighten ( or drove around with it hanging) your gas cap after filling up the gas tank. If this is the case then all you have to do is tighten the gas cap until 3 clicks are heard. The code will reset itself after several days of driving. If the code does not reset then you may have a defective gas cap or another leak in the fuel emission system.

99% of the time the code is caused by a gas cap that was not tightened properly.

here are more details for P0440

May 04, 2011 | 1998 Toyota Camry

1 Answer

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???

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.

Jul 16, 2010 | 2003 Chevrolet Cavalier

1 Answer

Code P0440. Have tried changing the gas cap but still service engine light on

2003 GMC Envoy has a problem with the gas tank. The plastic tank cracks at the filler neck inlet, causing some gas leakage and code P0440. GMC replaces gas tanks for free (up to 160?).

Jun 16, 2010 | 2003 GMC Envoy

1 Answer

03 dodge durando w 4.7l w a p0440 engine code

first thing, disconnect your battery and clear the code. before restarting check and make sure the gas cap is tight, should click at the least 3 times. if the light comes back on check the rubber lines that connect to the filler tube and make sure they aren't dry rotted and cracking. if their are no visible issues with the lines then it is a possibility the evap canister is bad. best bet is to take it to a shop or dealer and let them run a smoke test on the system, only after you check the gas cap.

Mar 08, 2010 | 2003 Dodge Durango

2 Answers

Check engine light on. Code P0440.

wow thermostat >>>> shucks i believe its evep emissions code like faulty gas cap can reset any computer the chck eng light will come on in 50 to 100 miles if not fixed....

May 07, 2009 | 2001 Buick Regal

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