Question about 2003 Chevrolet Cavalier

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My car wont pass DEQ. 2001 Cavalier 2.2L Everything is ready but the Evap system. No codes now. It was showing PO440 but now nothing and it still wont pass. Please help

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  • Chevrolet Master
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Replacing the gas cap most likely will solve your problem. Make sure the cap clicks three times when you turn it or it will not seal.

Posted on Jun 08, 2009

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1 Answer

What is codes po128 ,po440 and p1189 for a 2003 ponyiac grand am gt 3.4 liter and v6 engune?


Oil pressure switch issue
Coolant temperature sensor issue
EVAP system issue
All different issues, so I suggest seeing a mechanic.

Jan 28, 2015 | 2003 Pontiac Grand Am

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I have a 2001 daewoo sport with a engine code po172 and po440


first cde is engine is running to rich second code you have a large leak at the evap system

Sep 22, 2014 | 2001 Daewoo Lanos

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Hello there,my 2001 echo is lighting up trouble codes p0440 p0441 p0446; how and where should i start?


code p0440 refers to evaporative emission (EVAP) system--malfunction=== causes --hose connections --intake leak--EVAP canister purge valve
code po441 refers to EVAP --incorrect flow detected==causes the same as for po440
code po446 refers to EVAP system vent control --circuit malfunction===causes --wiring---EVAP can purge valve--ECM
generally I would replace the purge valve as it is common to all codes

Feb 03, 2014 | Cars & Trucks

1 Answer

I replace the evaporative system but the code do not reset


The code was po440? po456? these codes must be tested and passed by the cars computer system before it passes the evap monitor. testing criteria fuel tank must between 15% and 85% and must be sitting 8 hours minimum when key is turned on outside air temp and engine coolant temp must be within 10 degrees of each other. start engine let idle for 3-5 minutes take for a short drive 3- 5 miles lets sit then try it again this could take up to 3 days. With a factory scanner you can perform a evap bay test this is a forced test to see if a repair will the true test.if fails it will set a soft code for a repair then retest evap bay test again. Also factory scanner can tell you if a code has been test since codes cleared and if run this ignition cycle.and test results.

Nov 12, 2013 | 2004 Cadillac Deville

1 Answer

I have a 1998 Rav4 that I bought 5 months ago. I took it through DEQ and found that it had an evap code. Took it to a mechanic and he said the hoses were hooked up wrong. He connected hoses correctly and...


Disconnect the battery cables for about 20 minutes, then touch them together before you reconnect them. This alows the capacitors in the ecm to drain and clears the memory.
I hope this helps.

Jul 29, 2011 | 1998 Toyota RAV4

1 Answer

Po440 code


CODE PO440 IS EVAP SYSTEM MALFUNCTION CONDITIONS. POSSIBLE CAUSES 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 OR DISCONNECTED.OR FAILED.FUEL TANK VAPOR LINES 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.

Jan 12, 2011 | 2001 Chevrolet Venture

2 Answers

My 1999 cadillac deville shows a scan code of po440 what does it mean?


P0440 - Evaporative Emission (EVAP) System leak, poss gas cap not tight or left off

Mar 26, 2010 | 1999 Cadillac DeVille

1 Answer

I have a 2002 mercury cougar that wont pass pa emissions test. when i check the readiness staus it shows the evap system still hasnt completed its tests. theres no dtc's and i drove it all over trying to...


could be ur o2 sensors or clogged catalytic converter these have a lot to do with emmission sometimes its a bad gas cap number one problem evap get a new one and check code again the cap has a seal that if it leaks gives you evap code

Feb 20, 2010 | 2002 Mercury Cougar

2 Answers

I get a po440 and a po440 pd code


evap emission control system malfunction, po440

Jun 23, 2009 | 1998 Chevrolet Malibu

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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