Question about 2003 Chevrolet Silverado 1500

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Drop in oil pressure

Oil pressure gauge went from normal to 20 down to zero 3 times in the past 5 weeks 03 silverado 4wd 5.3L all three times about 40 miles into the ride

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The oil sending unit could be bad, or the pressure relief valve in the oil pump is malfunctioning.

Posted on Jan 28, 2009

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Oil pressure gauge reads high only when engine is running,oil level is fine


that is a sign of the wrong oil grade. that truck takes 5 w 20 oil

Jan 26, 2013 | 2005 Chevrolet Silverado

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Check engine light came on, checked oil and it was fine. I was looking at my gauges, and the oil pressure seemed really off. It's normally around 20 at idle which is normal then its normally at 40 when...


it could be as simple as a bad oil pressure, or it could be a bad engine. If the oil pressure was good before the oil change maybe the oil filter might be the problem

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1998 Dodge Ram, 2500, 360 motor,4x4, 53k miles towing a toy hauler trailer.temp got to about 240 going up some pretty steep hills today.there were no real signs of trouble,other than a little pinging from...


If I were you I would put an oil pressure gauge in place of the factory pressure sending unit, these can fail sometime when hot and cause false reading at the gauge, of the pressure seems ok replace the sender, oil viscosity can affect pressure readings but not to that extent, also check the simple things like your oil levels as these are commonly overlooked

Jul 31, 2011 | 1998 Dodge Ram 1500 4WD

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1999 Z-71 with high mileage (224,000) I lose oil pressure as the engine warms up. Cold start I run 40-50 PSI but after it warms up it drops to around 20-25 as long as your foot is in the pedal. When I...


I dont want to be the one to bring you bad news, but you most likly have engine wear. Bearing clearances, oil pump clearances all are getting out or tollarences. you can improve this by using 15/40 mptor oil , or heaver, but that is a patch. for a long shot change the oil presure sending unit or better yet use a mechanical gauge to verify the true pressure

Jun 11, 2011 | 1999 Chevrolet Silverado 1500

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03 s-10 truck 4.3 ltr 124k miles ZR2 MODEL


First we would need to know when this occurs. Asuming the oil level is at the full mark!. If the pressure goes up during acceleration and down at idle when engine is fully warmed up, then this is normal. An engine requires 10 psi of oil pressure per 1,000 rpm ( ex. 20 psi at 2,000 rpm, 25 psi at 2,500 rpm, and so on ) . If the gauge is moving back and forth erratically at idle , i would say the gauge is bad. If it drops to 0 while accelerating I would say your oil pump is bad. If from time to time it seems to work and other times it seems not to work, I would say the oil pressure sending unit for the gauge is bad. If the pump failed you would start to here a Knocking noise from the engine in a short period of time. Use the above scenario's to narrow down what it may be.

Jul 23, 2010 | 2003 Chevrolet S-10

1 Answer

Oil pressure guage intermitently falls to zero when idling. The dashboard "check gauge" light comes on. Has happened on three different occasions out of about 20 driving excursions. When it isn't happening...


My jeep also has started doing this. I replaced the oil pressure sensor. Sensor on the 4.7 is above the oil filter, follow the wires, typicaly is a 1 1/16 socket.

Dec 28, 2009 | 1999 Jeep Cherokee

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


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!!!

Dec 12, 2009 | 2005 Chevrolet Silverado

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It plunges down to zero at times then reads eratic


Your oil becomes too fluid as the engine gets warmer. When the engine rotates slower at stops, the oil pump won't make pressure. At speeds, more oil is pumped and the pressure rises.
Have you recently changed your oil? Or maybe is too old. The real problem would be if you read zero at normal cruising revolutions.

Dec 01, 2009 | 1999 Chevrolet Silverado 1500

3 Answers

Oil pressure on a 2004 5.3 liter silverado at idle is around 20


The pressure to be most concerned with is the reading in gear at idle with engine warmed up...Low end really should not be below 20. If pressure wanders, change the sending unit and check actual pressure with a mechanical gauge if necessary. The age and quality of your oil, as well as temperature all play a part in pressure, as well as internal wear from time & miles of use. If pressure changes with rpm, that is normal. 40psi is good while driving.
need more info just ask.

Apr 27, 2009 | 2004 Chevrolet Silverado

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