Question about 2001 GMC Sonoma Extended Cab

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My oil pressure gauge is fluctuating and on ocassion will peg out to the high side. What could be the cause? Oil always checks good on dipstick.

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Just did it...change the sending unit. Working good now with only minor changes. The gauge might read high until the engine warms up because the oil is thicker. I am still at 64 pounds and drops slightly when idling. What it always did.

Unit costs about $16.00.

Posted on Jun 03, 2010

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Sounds like it could be the oil pressure sending unit. I believe it's at the back of the intake manifold, on the driver side.

Posted on May 16, 2010

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1 Answer

Why is my Ford territory oil pressure light intermittently coming on


Good Day

Firstly check your all Oil pressure switches if they are not faulty.
Remove your electrical oil pressure switch and fit a mechanical oil pressure switch and start the motor:Oil Pressure reading should be between 4-8 bar on the gauge.
Motor must be at working temperature.
If Oil Pressure is below 4 bar their could be a problem on your crankshaft.Depending on milage.
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If the engine milage is high this can cause oil pressure fluctuation as their is wear on the bearings.

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Oil pressure high, oil level low


Oil pressure and oil level are two different creatures.

your oil gauge determines oil pressure while the oil can (red light on dash) indicates oil levels.

There are usually two different sensors but can gauge the same types of things. E.G. - If your oil is so low that your pressure gauge is affected this can cause engine failure. Thus--a good rule of thumb is to check your oil once a week as the oil pressure gauge and red oil can may not always work as intended.

I hope this helps!

Aug 13, 2012 | Cars & Trucks

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Fluctuating oil pressure


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Apr 05, 2012 | 2003 Chevrolet Impala

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Oil pressure guage has pegged on the high side. Would this be caused by a faulty Oil pressure sending unit? Engine is not overheating and seems to be running fine.


Bad sender is most likely, but could also be stuck oil pressure relief valve. You need to be sure, or the pump could break and destroy the engine.
Try a cheap mechanical gauge instead, screwed into the sender hole. If pressure good there, then check the sender with ohmmeter. If 0 or infinite ohms, replace sender. If not, see if gauge drops to 0 when sender disconnected. If not, then gauge bad.

Aug 10, 2010 | 2003 Chevrolet Silverado 1500

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Oil pressure gauge fluctuates from high to low. What could be the cause? Remedy?


Hi. This will indicate that there may be some sludge build up in the block, or the oil pressure switch may be damaged. The more serious issue will be a failing oil pump. To isolate the issue, simply, have a oil pressure test ran on this engine. If the test indicates that the true oil pressure is optimal at idle, kindly replace the oil pressure switch. Now, if the test proves that the pressure is indeed lower than factory specifications, this will confirm that the pump is damaged. Have the pump, and oil pump screen replaced, in this case.

NOTE_ I would, also, recommend to have the engine flushed asap.

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2 Answers

Oil pressure gauge has pegged tothe high side


Probably pressure sending gauge. Can't recall its exact location gotta be in block between ( or next to oil filter) and cam shaft. Unplug it put your pressure tester in its place and check your pressure.If a-ok either clean out the unit with compressed air or replace it . Replacement is the better option. Also check the wiring to the gauge it might be gounded. If pressure is still high when your checking it (which I really doubt) .....keep me posted I'll walk you threw it.

Mar 12, 2010 | 2000 GMC Sierra

1 Answer

The oil pressure guage on my 2006 nissan frontier is reading very high after recently changing the oil, however, the correct amount of oil was added during the change. Furthermore the oil dipstick...


The guage may rise a little when you accelerate the vehicle...but if it is pegged high, and does not fluctuate, when you turn your ignition key on an off...Your oil pressure switch maybe going bad...Goodluck

Dec 04, 2009 | 2006 Nissan Frontier

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Oil pressure guage went from 40psi to 60 , 80 then pegged and stuck there


check your pressure with an external gauge if you really do have high pressure then you pressure relief valve on your pump is stuck not easy on your seals but as long as it isnt fluctuating( pumping all of your oil out of the pan before more can trickle back into it) or not over 85ish youll be fine. check for sludge of foriegn objects, it might just be stuck but it may have something stuck in it. if your gauge is wrong its probably a short, you should look for frayed wires but youll probly have to wait for something else to go before youll find it

Oct 13, 2009 | 2004 GMC Sierra

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