P0442 + click,click,click on 2001 Cadillac STS

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OCG - 30 May 2005 23:12 GMT

I have a 2001 STS which recently turned on the MIL and shows DTC P0442.
I've check the obvious (gas cap is on tight), and temporarily cleared
the code.

Coincidentally, I recently noticed that within a minutes of driving I
hear a "Click,click,clik" from the back right. (Near the charcoal
canister). Sounds like a solenoid.

Has anyone see this problem before? Are these symptoms connected?

I found the EVAP purge valve (at the throttle body), but there should
be a second solenoid somewhere...

Thanks!

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Shep - 31 May 2005 00:35 GMT

You may be hearing the vent solenoid valve, this code refers to a small evap
leak, if that valve fails to seal the vent during an evap test it will set a
code, this solenoid should be near the vapor cannister, could be full of
dirt or just a bad connection, but that is a starting point.

>I have a 2001 STS which recently turned on the MIL and shows DTC P0442.
> I've check the obvious (gas cap is on tight), and temporarily cleared
[quoted text clipped - 10 lines]
>
> Thanks!

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OCG - 31 May 2005 01:01 GMT

I think it is the vent vavle I'm hearing. Why would it click 3 times?

>From what I've read, the PCM does a leak test shortly after engine

start, but over the past 2 years I don't recall this CLICK CLICK CLICK.

Does the valve normally cycle 3 times? Is it failing a leakdown test
and then retrying twive?

Thanks

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Shep - 31 May 2005 17:43 GMT

It is possible a bad solenoid or corroded connections may do this, take a
look at it and also verify this is the source of the clicking.

>I think it is the vent vavle I'm hearing. Why would it click 3 times?
>>From what I've read, the PCM does a leak test shortly after engine
[quoted text clipped - 4 lines]
>
> Thanks

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