Question about 2005 Chevrolet Silverado

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Oil pressure drops to 0 if i turn off truck and restart it goes back up to 40

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  • huskyny Dec 13, 2009

    oil pressure drops to 0 while i am driving, if i stop and turn the truck off and turn it back on again it will go back to 40

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Do you have enough oil in it? If it's real low on oil the oil can't flow back into pan fast enough to keep the pump from cavitating. It might be the gauge try puting a mechanical gauge on it for test purposes. When the gauge drops to zero does the engine get louder, like it's not getting oil? Do you hear the lifters start to clatter, or rods starting to knock? If the engine sounds normal there's a good chance it's just the gauge. If it's making noise shut it off right away!!!

Posted on Dec 12, 2009

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You have a mechanical oil pump so you will only have oil pressure when the engine is running or cranking. This is normal!

Posted on Dec 12, 2009

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That is normal!!

Posted on Dec 12, 2009

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Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair

Posted on Oct 07, 2010

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Just got the truck, oil pressure drops off, get a tap in top end, turn off, restart and its back for awile ?


may be bad oil pump. Try a standard 40 weight oil see if the noise and low pressure problem goes away, if so its the oil pump.

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your oil pump is either weak or there is sludge i9n the oil pan. my adives is to have the oil pan dropped . chances are sludge is the culprit. as the oil get's warm the pressure should only drop slightly but pressure is generally dictated by engine rpm. pumps are gear driven so if it was a bad pump your oil pressure would start out very low at start up.

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