Question about 2003 Pontiac Bonneville

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Oil pressure gauge pegged at120 on 2003 pontiac bonneiville ssei from startup to shutdown was wondering if it was the oil pressure sending unt

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  • Gabe Gilsrud May 11, 2010

    soes it rise when the key is on, but the engine is not running? if so then yes, the OSU is bad.

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Your gage is electronic I take it, buy or borrow a regular gauge and test it again. If the pressure is indeed 120PSI your oil filter is about to blow the cover off itself. This issue is most often caused by a stuck pressure relief valve on the oil pump. And indicates replacement is necessary.

Posted on Jul 25, 2009

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Its probably the sending unit...cheap fix too.

Posted on Jul 25, 2009

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I have a pontiac bonneville 2002 ssei and the oil guage was usually between 40-80 when running. Now it is dropping to like 30 when just idling, what could cause this?


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First I'd get a gauge under the hood and get a true pressure check on the oil, perhaps the sending unit is failing. If it reads fine be certain the filter is clean. If still nothing it is within the engine, you can try to use a heavier oil that may increase your oil pressure.

I hope thi may have assisted you,
Tom

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