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I got a p0440 code how do i fix - 1998 GMC Sierra

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Check the seal on the gas cap, if air gets in it can throw this fault, if ok then it is likely the purge valve is faulty

Posted on Feb 12, 2012


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What be the most common thing wrong with the car for it to have the code p0440

need to put your car on a scanner to properly diagnose your problems p0440 evap system,128 thermostate ,p0742 torque convertor,p0327 knock sensor. take your car to a good mechanic

Dec 02, 2014 | 2003 Chevrolet Impala

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What is po44o code mean and how do I fix it

The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0440 code.
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Nov 22, 2014 | Cars & Trucks

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Here's a link to the code.Here's the purge solenoid.

Mar 26, 2013 | 2003 Chrysler Voyager

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03 cavalier shows p0440 code startrs stumbs and dies

P0440 code translates to Evaporative Emmission System (EVAP). I suspect that your gas cap is not fitting tight enough on your tank to build up enough pressure to keep the EVAP sensor from detecting a fault. You may have to replace your gas cap or check to see if it was tight. It may take a few trips with the fault fixed to extinguish the light and more to get rid of the P0440 code in your computer. Removing the cable on your battery, the negative one for about two or three minutes may be enough to make your computer forget.

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Code P0440 on 2001 Sunfire

I would say start by replacing the gas cap with a genuine GM product. If that doesn't fix it there are a few more suggestions here --> P0440 @

Mar 04, 2010 | 2001 Pontiac Sunfire

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I have a 03 cruiser with a code po44o

Error code P0440 =Evaporative Emission (EVAP) System. This site explains why & how fix the problem.

Jun 25, 2009 | 2003 Chrysler PT Cruiser

1 Answer

What does code p0440 mean??what can i do to fix it??

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, inspect, clean the sealing gasket and reinstall the gas cap, clear the code, and drive for a week and see if the codes come back. If the code comes back, have the gas cap itself checked. If all is ok, then move on to the rest of the possible fixes. 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

Jun 06, 2009 | 2003 Pontiac Sunfire

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

1 Answer

Service Engine Light

P0440 Evaporative Emission Control System Malfunction. First thing,is the gas cap tight and working? Common cause of this code.

Jan 03, 2009 | 1999 Chevrolet Monte Carlo

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