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Po440code 96nissan pu 2.4engine replaced gas cap code still coming on

Replaced gas cap

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  • Nissan Master
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Hi there:
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.

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

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

Posted on Feb 22, 2012

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  • Contributor
  • 31 Answers

You must have a leak somewhere in the tank, because gas caps seal and vent at a certain pressure (1-2psi) a smoke test would check it. Try clearing the code first. If it keeps comming up, test it.

Posted on Feb 22, 2012

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Gas cap light stays on


Take off your gas cap and put it back on if that does not fix it so the light goes off replace the gas cap. This light usually indicates. A problem with the gas cap. It maybe on crooked or is not sealing properly in which case it would need to be replaced. It may need to be driven a few miles before the light goes off

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2006 Scion TC code read code PO441-PO455 What does this mean and what do I check?


A code p0455 most likely means one or more of the following has happened:

* A loose or improperly affixed gas cap
* A non-conforming gas cap (i.e. not factory/original brand)
* Other leak or damaged piece in EVAP system
P0441 is Evap Emission Incorrect Purge Flow;

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1 Answer

Po440 code 96 nissan pu 2.4 engine


Hi Glenn:
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.

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

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 22, 2012 | Cars & Trucks

1 Answer

Po440 code 96 nissan pu 2.4 engine


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.

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

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 22, 2012 | Cars & Trucks

3 Answers

I have a 2008 silverado PU. The engine code PO 449 and PO 455 shows. what problem are these codes


this is an obd2 trouble code table, it can help you understand the meaning of code.
for the p0445, the causes:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system
Possible Solutions:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary.
I know this tool can help you clear the code.

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OK, if pressure doesn't build up in the gas tank, a bad gas cap code can come up.
Replace the cap to see if that helps. But, if it still comes up with a code for the gas cap being loose or missing, then the filler neck or the gas tank or the evaporative hoses may be loose or leaking.

Good luck on this repair.

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I have a 2003 dodge ram 1500 4x4 pu and have a p0441 code. i replaced the fuel cap but still no results.


On a Dodge a lot of times this light comes on because you are putting gas in the car or truck with it running, have someone with a OBD2 box clear the code and try this, when you open the gas cap with it running it sucks air and sets off the light due to a purge in the system. I hope this helps

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1 Answer

For code#po442


evap system leak small most of the time this code comes from forgetting or properly replace their gas cap--others are gas cap not sealing replace cap-or a small leak in the fuel vapor lines -check cap and reset code if comes back check seal arund cap repair or replace if damaged -if good inspect the fuel lines and hoses for small cracks or damage repair or replace if necessary

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