Question about 2003 GMC Envoy

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2003 GMC Envoy - High Oil Pressure Reading

My oil pressure gauge is reading WAY beyond the high mard, it is as if someone has rotated the needle clock wise by 90°...where do I start in trouble shooting this, I have asked the dealer and they simply shrug their shoulders & say there is nothing they can do unless the service engine lite come on & produces an error code.

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  • afisher_80 May 24, 2009

    Thanks,



    After finally looking into this last night I believe the diagram you had sent me was not for the 4.2L..I have removed the skid plate for a better view of the bottom end & cannot locate the sensor, I will take a second look this morning but it does infact look like a different block.

  • afisher_80 May 25, 2009

    Perfect, thanks Greg the sensor is now changed...but the problem still exists. Now where to look, is it possible that the problem is in the instrument cluster - faulty gauge? This vehicle definitely has some electrical issues, the service ABS lights also come on, but only when it is cold out (-5 and below), every time the temperature drops it never fails the light & chimes are going off. I have taken it to the dealer for this as well & the best they could tell be was to check the ground on the ABS Module located on the frame below the driver seat. Having said all this as far as the brakes go, the ABS still function 100% even while this warning light is on.



    Anyone having any similar issues please comment.



    Thanks!



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Sounds like an oil pressure sensor. Here is a diagram to locate it for removal. Best of luck.
Greg

http://www.chiltonlibrary.com/content/images/21202/images/21202_GDIA_g518.pdf

Posted on May 18, 2009

  • Greg Margossian
    Greg Margossian May 25, 2009

    Sorry, didn't know the engine size. This diagram (figure #4) should be more of assistance. All the best!

    Greg



    http://www.chiltonlibrary.com/content/im...

  • Greg Margossian
    Greg Margossian May 25, 2009

    There's a tester for checking actual oil pressure. Before investing in more expensive parts (i.e. oil pump) or tearing apart your dashboard, you may want to check the actual pressure to see if it's really high or showing a false high. If it checks out normal, it would seem everyone has an opinion on this issue. Some have suggested running thinner oil, some recommend changing out the oil guage in the cluster, and some have chosen to ignore it all together figuring high oil pressure beats low oil pressure. Hope this gives you a few ideas on how to cope with this issue. Best of luck.

    Greg



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This is a relatively new car and if this problem developed immediately after the oil change I'd suspect the wrong oil was used or the wire to the sensor was knocked off. If the problem developed near the oil change, but not right after, I'd suspect it was coincidence and that there is a problem with the gauge. Go back to your mechanic.

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