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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I HAVE CODE 0440 MY SERVICE SOON LIGHT ON I FIX FUEL CUP BUT STILL ON LIGHT WHAT TO DO


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

2 Answers

Pontiac Bonneville SE coming up with ODB2 scanner codes P0301 and P0440


Hi Becca:
P0301 Code - Cylinder #1 Misfire Detected
A P0301 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #1.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

A code P0301 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
- If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
- If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


P0440 Code - Evaporative Emission Control System Malfunction
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.

You likely won't notice any drivability problems.

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

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

Other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0446 - P0453 - P0455 - P0456-

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 15, 2012 | Pontiac Bonneville Cars & Trucks

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
http://www.obd-codes.com/p0440

May 04, 2011 | 1998 Toyota Camry

3 Answers

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.

Mar 16, 2011 | Buick LeSabre Cars & Trucks

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 ....you 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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