Question about 2005 Cadillac Deville

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The engine light came on and it said "service engine soon". I called On-star and they said to drive it seven more times. They said the diagnostic code was P0442. I looked it up and it said possible

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  • kimowhitaker Nov 29, 2012

    All comments were helpful. Additionally, after replacing the cap brought from O'reilly for $11.00 bucks, I asked them to reset the code. They informed me that they could not, however, an official state licensed inspection station rep could. I took my 2005 Cadillac to him and he ran a diagnostic test to make sure all of the emission system was working properly under that code of P0442. After resetting the code, he advised to drive it around town and out in the country and back so that the computer could resit itself. I returned to him and he said all systems were working properly! No cost to me other than the gas cap. Thanks for all of your inputs.

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I don't know the age of your car, but it is likely the O ring on the gas cap is leaking, not allowing the fuel system to work properly. If you forgot to put on the gas cap or did not tighten it, after seven runs, the check engine light should clear. If it does not, then the easiest solution is to buy a new gas cap from the dealer. It will be about $25 - $30, and you can install it yourself. After installing the new cap, and seven trips later, IF the gas cap was the problem, the light should clear.

I have tried to replace the O ring on a cap before, but found it nearly impossible. Another trick would is to lightly coat the O ring with vasoline - then seven trips to see if that clears the light. This is only a temporary solution, but it may tell you if the problem is the gas cap. Godd luck!

Posted on Nov 27, 2012

  • kimowhitaker Nov 27, 2012

    I have added a new gas cap. I had a diagnostic test ran by my local inspection center using code P0442. He said to drive it for a while and let the computer reset itself and he will re-test it. Thanks for your help thus far.

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Posted on Jan 02, 2017

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SOURCE: 2005 Cadillac Seville. Replace gas cap

im having the same problem with my deville did replacing the cap fix the problem

Posted on Oct 18, 2012

  • 14036 Answers

SOURCE: 1998 sls service engine soon light stays on.

CHECK ENGINE LIGHT WONT GO OUT LONG AS THE GAS CAP IS FAULTY.

Posted on Sep 29, 2009

  • 1 Answer

SOURCE: I have a 2001 Cadillac DeVille DHS, 144K miles,

Yes, first try securing it tighter. This means until you hear it making noise. Go to advance or autozone and have them reset the code. If it still turns the SES light on, replace the cap. My 2001 DTS did the same thing at 144K. You may be on the same track I am on. So far I replaced that, the EGR solenoid (get the Delphi brand) and now it looks like I have to replace my EGR vent. During this I also had to replace my fuel pump. Fortunately on this model it's easy to get to through the trunk. I ended up having to splice in a new connector. They don't come with the old one any more. Good luck.

Posted on May 05, 2010

  • 139 Answers

SOURCE: 2003 Cadillac Deville a check gas cap error appears with svc engi

put a new gas cap, those system are pres. even if
the cap look ok it maby leaking replace with a new
one it should solve your prob.
eng.ligh come on because of the gas cap

Posted on Apr 09, 2009

flbergeron68
  • 541 Answers

SOURCE: My 2005 Cadillac Escalade engine light is on and

replace sensor at gas fill up tube

Posted on Jul 06, 2010

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