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Old 05-01-2008, 02:37 PM   #1
hydromech
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2000 SL1
Default Code P0442 – new gas cap…

Got code P0442. Replaced gas cap, had the code reset. It came back in 3 days… Now it is listed twice...

Any ideas – what else to check? The car is running fine – 31 MPG

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Old 05-04-2008, 10:11 PM   #2
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2000 SW2
1998 SL2
Default Re: Code P0442 – new gas cap…

Since no one answered I'll give you two things to try. First replace the ECTS. Don't know what I'm talking about? Use the forum jump at the bottom of the page and go to the How-To Library. The sticky at the top explains all about it. Also replace your thermostat. If that doesn't do it, replace the cannister purge solenoid.

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Old 05-04-2008, 10:44 PM   #3
samsr
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2000 L-Series 3.0L Wagon
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Default Re: Code P0442 – new gas cap…

I just repaire that same code except my code came up as soon as I started the car. It seems that some mice got to the wiring harness by the ecu on my 2000 SL2. The only two wire that it got to were the ones for the purge canister by the fuel tank. Whoed of known. Drove me nuts finding it though. Hope you find it.

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Old 05-05-2008, 12:09 AM   #4
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Default Re: Code P0442 – new gas cap…

Check air filter, all vacuum lines and ensure air intake clamps are tight. PO442 is the code for a small vacuum leak.

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Old 05-05-2008, 09:50 AM   #5
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Default Re: Code P0442 – new gas cap…

Thanks a lot for info and advice, guys.

One thing - this code P0442 first poped up shortly after I did my regular throttle body cleaning with a spray-cleaner... Maybe I created that small vacuum leak myself ??

I already cheched all intake clamps and vacuum connections - look OK.

Is there a diagram for EVAP for Saturn SL ?? It would really help to trace ALL vacuum lines and find a leak...

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Old 06-12-2011, 11:39 AM   #6
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Default Re: Code P0442 – new gas cap…

I'm getting this p0442 code AGAIN

It is ON for a month then OFF for a month... I can't go for Emission Test with that code

Anybody has any idea what to do about it ?

...
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Old 07-05-2011, 11:52 AM   #7
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Default Re: Code P0442 – new gas cap…

i have the same issue. have u had any resolves?

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Old 07-05-2011, 02:09 PM   #8
manualman
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1995 SL
Default Re: Code P0442 – new gas cap…

Ideas:

1. Gas cap. Fixed mine (already tried by the OP)
2. Gas filler tube mating surface for gas cap. Any nick or corrosion there will spoil the seal to the cap. Stuff tube with rag, sand well, vacuum up debris, grease lightly to fix.
3. vacuum line to evap solenoid. This is the vac tube from the throttle body that runs straight down under the intake. Sometimes is dislodged from the solenoid.
4. Check all vacuum lines for deterioration. The PCV is classic.
5. Check for intake manifold gasket leak with TB cleaner. Spray along mating surface. If idle speed changes at all, the gasket is bad. Especially common in 3rd gen SOHC engines.

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