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How to fix the code p0440

Code p0440 comes up on scan tool how to fix?

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  • Jeep Master
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No jeep or year stated, are you kidding? nor engine option.
x3 hard failure....!!! strike 3 your out? nah. ill try.

ok, millions of folks now have posted 440, to the net.
you can google it ,or read the FSM. I cant help with no year/engine or body, you never said what body car is, wrangler, GC ? what?

440 the is a federal USA standard code P0 means that.
440 is EVAP errors (gas tank venting tests failed, bar stool answer)
why not do as all others do with out the fancy EVAP tests system.
(i built my own)
1: tighten the gas cap , reset the DTCs with the scan tool button and drive and hope it dont come back, millions served !
2: panic, (i would) and buy a new real jeep spec,.gas cap. bingo.?
no bingo.
3: read the fsm;. on EVAP check all hoses for fell off and cracks

its all here if lucky (no year or car stated)
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

lots more can be bad. lots of test. the first it to find which path is leaking or if the check circuits are bad.

Posted on Feb 11, 2014

  • _-__-___-_
    _-__-___-_ Feb 11, 2014

    wrong cap? missing cap. vacuum breaker cap missing or leaking>? seal in cap Bad.? , and lots more,,, i have a vacuum leak and pressure leak down tool that i use to find any leaks.

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SOURCE: Trouble code p0402 is coming up on the scan tool, what is the problem?

On a domestic car using a scan tool, the trouble code p0440 is an Evaporative Emission Control System Malfunction. It can mean the gas cap is not installed or working right, the purge solenoid has failed, or the canister is plugged and not working right.

Posted on Oct 29, 2012

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3 Answers

What does code 440 mean on a 2000 Chevrolet Malibu


P0440 - is a large EVAP leak. The EVAP system stores fuel vapor from the fuel tank and then delivers it into the engine under certain condition. The EVAP system basically consists of a purge solenoid, vent solenoid, charcoal canister, fuel tank and a fuel tank pressure sensor.

There are two common causes for this code. One is the fuel cap, make sure it is tight. Also check the filler knock where the gas caps seals to see if there is an excessive amount of rust build up which can also cause this code.

The other is the vent solenoid. If it sticks open the system will not be able to go into a vacuum mode. The vent solenoid is usually tucked up in the quarter panel on the drivers side right behind the tire.

A scan can tool is usually needed to monitor data and activate solenoids.

Feb 27, 2015 | 2000 Chevrolet Malibu

1 Answer

P0440 code is on I cant figure out what could be causing the code to come on I put a scanner on to erase code it stays out for aweek then comes back on


The gas cap could be defective so replacing it may be the cheapest fix if it works. I have seen in many cases the problem is more difficult to fix that just replacing the gas cap. I would suggest trying that first before taking to the shop . The tech will most likely smoke test the system for leaks first and if none are found they should use the bidirectional controls on a scan tool to operate the evap systems individual components to make sure they are working. Goodluck

Nov 13, 2014 | 2000 Buick Century

2 Answers

P 0430 & p0420 catalyst system


here are some solutions to your codes and possible causes, maybe you have seen these pages already. when you say the converters are punched out, does that mean there are holes in them? a scan tool does not cause trouble codes, it detects them.

http://www.obd-codes.com/p0440
http://www.obd-codes.com/p0420
http://www.obd-codes.com/p0430

Nov 18, 2013 | 1998 GMC Sierra

2 Answers

OBD 440 Error and Check Engine light ON. Already replaced new Gas Cap, Solenoid behind Gas Tank. Still the Light comes on.


Now have a repair shop do the proper testing & resolve

Need system diagrams,scan tool & evap smoke machine

Feb 07, 2013 | 2001 Toyota Camry

1 Answer

Trouble code p0402 is coming up on the scan tool, what is the problem?


On a domestic car using a scan tool, the trouble code p0440 is an Evaporative Emission Control System Malfunction. It can mean the gas cap is not installed or working right, the purge solenoid has failed, or the canister is plugged and not working right.

Oct 28, 2012 | 1996 Lincoln Town Car

1 Answer

Solution for 1999 chevy cavalier code p0440


There has been a service bulletin isued for that code. I have run into this before, also the wires comming out of the connector. That would bethe first thing to check. Here is what the bulletin states. Emissions - SES Lamp ON/DTC P0440 (EVAP) SetNotesFile In Section: 06 - Engine/Propulsion SystemBulletin No.: 02-06-04-044Date: August, 2002TECHNICALSubject: Service Engine Soon (SES) Light Illuminated, DTC P0440 Set (Replace Fuel Tank Evaporative Emissions Control System (EVAP) Vent Solenoid Harness) Models: 2000-2002 Chevrolet Cavalier2000-2002 Pontiac Sunfire ConditionSome customers may comment that the SES light is/was illuminated.A technician may find DTC P0440 is stored in the PCM.CauseThe EVAP solenoid harness may be misrouted around the rear antilock brake (ABS) wire harness causing a chaff/damage to the EVAP vent solenoid harness, setting DTC P0440.CorrectionFollow the service procedure below to diagnose and correct this condition.1. Install a Tech 2 scan tool and select the appropriate vehicle. Verify that a DTC P0440 is stored in the PCM. 2. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information (SI Document ID # XXXXX).

4_9_2012_3_31_41_pm.gif

Locate and inspect the EVAP vent solenoid harness (3) routing. The harness may be routed below the ABS wiring harness (4) at the right rear corner of the fuel tank, causing stress on the EVAP solenoid harness (3).



4_9_2012_3_32_10_pm.gif

4.Disconnect the EVAP vent solenoid harness (3) from the EVAP vent solenoid (2) and connector C313 (1). Discard the EVAP vent solenoid harness (3).


5.Connect the new EVAP vent solenoid harness (3), P/N 22687059, to the EVAP vent solenoid (2), route the harness above the rear ABS harness (4) and connect the EVAP vent solenoid harness (3) to connector C313 (1).


6.Lower the vehicle.


7.Clear the DTC's with the Tech 2 scan tool.



If all of the wires are good you will want to check for any leaks in the evap system.



Hope helps.

Apr 09, 2012 | 1999 Chevrolet Cavalier

4 Answers

My check engine light come up w/ all these code P0305,P0440,P0441,P0446 what's wrong Thanks


po305 is related to missfire on #5 cylinder
po440 is related to fuel tank pressure
pO441 is for evaporator purge flow malfunction
po446 relates to vent control valve electrical circuit malfunction

missfire is seperate from the other codes
as for the other three codes replace the vent control valve solenoid located near the charcoal canister the oth3er codes can relate to a faulty solenoid

after replacing light will only go out if you clear through a scan tool or three drive cycles of over 10 min each

Jan 10, 2011 | 2000 Lexus RX 300

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 ....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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