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06 chev malibu 6 cy code po442, allready changed gas cap, what else to look for?

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A code P0442 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)
  • A small leak/hole in a fuel vapor hose/tube
  • Other small leak in EVAP system
  • Faulty vent o-ring seal

Posted on Jan 31, 2009

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What does po442 code on a 1999 pontiac grand am 3.4 v6 mean



Trouble Code: P0442

EVAP System Small Leak (0.040") Detected
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, disconnected or it failed. Fuel tank vapor line(s) is clogged, damaged or disconnected. Purge valve vapor line is clogged, damaged, or disconnected. Purge solenoid or Vent solenoid has a small leaking (sticking.) PCM has failed . TSB 01-06-04-007A contains a repair procedure for this code.

Jul 28, 2012 | Pontiac Grand Am Cars & Trucks

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I am getting a po442 code on my scan tool. A small evap. leak detected. I have replaced the gas cap a couple of years ago. I put the lite out and it stays off for about a year then comes back on. Anybody...


This is what they call a 2 trip code. It takes two running times to set. Small leak is 98 % of the time gas cap not on tight enough. Three clicks minimum. Just reset the computer and see if it comes up again. For your year EVAP is not a big deal. Doesn't hurt fuel economy or performance.

Jul 02, 2011 | 2003 Chevrolet Malibu

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My 2000 chevy malibu is reading p0302 p0241 and p0442


PO302 misfire # 2 cyclinder, PO241,boost pressure circuit low, PO442 evap has small leak, The misfire is the code you need to verify first, if you want to fix it yourself your best bet is to replace the sparkplug and inspect the soil boot for and burn through marks(whitish)then take the #2 COP and swap it with another COP and see if the misfire moves if the misfire moves replace the COP,as for the PO442 tighten or replace the gas cap

May 26, 2011 | 2000 Chevrolet Malibu

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I have the code po442(smalleak) I have replaced


hi you get this code if the gas cap dose not seal so will any pressure loss in the gas tank or a related component get your local dealer to run a smoke test on the evap control system to exactly pinpoint the leak hpoe this helps

Dec 06, 2009 | 1999 Pontiac Grand Am GT

1 Answer

2 po442 codes showing up on my 2003 buick century


If there was a leak at the gas cap. EG: Left off or loose after fill up? You will need to have the codes cleared or it will clear itself after enough key cycles. EG: Started and shut back off as many as 20 to 50 or more times.

Jun 01, 2009 | 2003 Buick Century

1 Answer

Check engine light-code-po442


This is an emmissions code that says there is a leak in your evaporative system.I would start by changeing the gas cap.

Mar 04, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Gas smell error code po442 what now changed gas cap


Possible loose gas cap, or fuel leak, check under the car very well. Is the car starting hard after sitting?

Oct 14, 2008 | 1996 Pontiac Sunfire

1 Answer

Diagnostic code PO442


PO442 is an Evaporation Emission leak. It's probably a loose gas cap. The fix would be $96.00 at our dealership, since your truck is out of warranty. You may be able to get it fixed cheaper, but you'll be charged a diagnostic fee.

Jun 24, 2008 | 2002 Mazda Protege

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