Question about 2002 Chevrolet Trailblazer Ext

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In my 02' Trailblazer oil pressure gauge goes below 0

When I'm driving, and I turn to right the oil pressure gauge goes below to 0 suddenly and then returns to its normal position. I suppose this is a wiring trouble, but I need to know where is located the oil pressure sensor to solve it.

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  • malvalc Jul 21, 2009

    Thanks for your reply,
    I allways check the oil level and it is ok. The trouble may be is a bad contact of wire sensor. I'll check it.
    Best Regards.

  • Anonymous Mar 17, 2014

    when you turn the ignition off it goes back to 0.also Iwould like to the location of it ,what is the sensor with wire on the right side of iol pan

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I have this same problem with my 2002 trailblazer; however, I goofed up and had a mechanic look at it, since I was perplexed as to what was going on with it. He told me the oil pump needed replacing and it ended up costing me around a $950. Needless to say, it still happens. A grand down the drain - it wasn't the oil pump. The oil level is always good. This generally occurs when I've run the vehicle for a while and then come to a stop. It occurs quite often during the spring/summer and doesn't happen all that much during colder months.

Posted on Apr 13, 2010

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I have worked on them so much with the oil pressure drop i found that the problem was in the dash cluster a misfit on the chevy trail blazer

Posted on Dec 23, 2011

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I suspect its your pigtail connection...I have the same problem and doubt seriously that it is the pump. The mechanic would gladly take your money especialy for a pump change job.

Posted on Jul 22, 2010

  • trailblazerc Feb 12, 2011

    whats a pigtail connection

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Usually when oil pressure drops on turns or braking, you need to check the oil level and add oil. It is unwise to permit the level to become that low as each time you turn, the oil in the pan is sloshing away from the pump pickup and starving the system for oil. If level is not low, check that wire for sensor is not chafing against anything and shorting (though generally if that happens, the gauge would read high not low)

Posted on Jul 21, 2009

  • Richard Scordino Jul 21, 2009

    Just to be on the safe side, I'd have the pressure tested using an external mechanical gauge. As I mentioned generally if the sender wire grounds, it will read overly high, but I suppose that the connector may be loose which can give your symptom. Just don't ignore it ...oil pressure is essential to keeping your engine all in one piece!!!

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