Question about 2001 Pontiac Grand Am SE

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They did a smoke test and replaced the hose that was leaking code still popped up . po440 grand am

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P0440 evap small leak detected. Should find with smoke machine. However, there could be a reflash for the computer to prevent this issue. Have the tech check for updated computer programs. If none are available you have a small leak in the fuel vapor system.

Posted on Nov 13, 2009

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2 Answers

I have a 2004 town and country. I have had codes po440 on for about 9 months with no symptoms. Then po456 showed up. My van started surging wanting to take off after filling the tank. Then it would not...


code p0440 refers to evaporative emission (EVAP) system--malfunction===causes -hose connections--intake leak--EVAP canister
code po456 refers to the evaporative emission system--very small leak detected===causes --mechanical fault--hose---EVAP pressure sensor. The cracked hos may be the fault but I would be looking at the canister for the fault.

Nov 03, 2013 | Cars & Trucks

1 Answer

CODE NUMBER 456


EVAP emission system (small leak detected during vent closed test 1) error;
This is usually a broken line somewhere. Sometimes it's the connector on the EVAP canister itself (large plastic canister with two ports and hoses coming out of it). Unfortunately, when I smoke test these, it's usually bad news (the large hose running back to the fuel tank from the EVAP canister has a pinhole leak in it). Holes as small as a human hair in diameter will set this code. Check the large vacuum connections on top of the canister to the throttle body. Check the canister itself, if it's cracked, it must be replaced. If all that tests out, have the system smoke-tested for leaks. Replace any hose that fails the test. Clear the condition and turn off the MIL. Drive the car for twenty minutes to see if it comes back.

Sep 20, 2013 | 2001 Dodge Grand Caravan

1 Answer

PO440 GMC SIERRA NOT ENOUGH VACUUM


No idea, why you or anyone would buy any parts

You have to diagnose & find the problems with vehicles,
& then only after you know how to component test, do you
replace a part that fails a test

Now you need to Evap Smoke Test the system, to find the leak
or failed component

Apr 05, 2013 | GMC Sierra 1500 Cars & Trucks

1 Answer

Check engine light is on- reason- Evap emission control system malfunction- code PO440


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 to rate this).

Oct 12, 2010 | 2002 Chevrolet Blazer

2 Answers

My 2001 Jeep has evap leak codes p0455 and p0442, it has been smoke tested and there were no leaks found, but the codes are still there any ideas


I do not know the codes but after a smoke test ,I would use the codes and a schematic to walk down and test every switch or valve in the EVAP System. A professional scanner would be nice,so you could command somethings on and off.

Mar 12, 2010 | 2001 Jeep Grand Cherokee

2 Answers

Yes i tested with a dinosic and and it came up with a code po440 on my 1999 s-10 i need help


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

Oct 22, 2009 | 1999 Chevrolet S-10 Pickup

1 Answer

Evap sistem problem code 171


Code is for small leak.If you can't see any broken hoses in the evap system you'll need to find a repair shop capable of running a smoke test on it.What a smoke test does it injects smoke into the evap system and you look for where the smoke come's out.the smoke machine sell's for a little over a grand so not every shop has one.Just to give you an idea,we charge an hour labor to run one which is $82.00.

Aug 11, 2009 | 2001 Hyundai XG300

1 Answer

03 Jeep Liberty - Evap system small leak


how about the filler neck. just had to replace mine and now its fine

Jun 17, 2009 | 2000 Jeep Grand Cherokee

3 Answers

2000 cavalier check engine light code po440


P0440 - Evaporative Emission (EVAP) System


evaporative emission (EVAP) system has a large leak.
Check the gas cap or vent valve. these are the most common problems.


The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the Fuel tank pressure sensor (FTP). When the sensor indicates a small leak in the EVAP system, this code is set.


Here are some additional causes.

* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking

Jun 06, 2009 | 2003 Chevrolet Cavalier

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