Question about Chevrolet Silverado 1500

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I have a 97 Silverado that has the oil pressure pegging out as high as it will go. Want to check the pressure but can't find the oil pressure sending unit....anyone know where it is?

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It is on the side of the block a little above the pan.
Check pcv valve as well to make sure it is not stuck or plugged.

Posted on Nov 10, 2010

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1 Answer

My oil pressure gauge always reads as high as it can go when the truck is running. I actually think it is a bad stepper motor. Can anyone confirm my suspicion?


unplug the oil pressure sender and see if the gauge goes to zero. If it does than the old cluster was not working properly and the new one is. If the gauge continues to peg with the sender unplugged than your on the right track with a bad cluster.

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M oil pressure Guage is pegged out. And speedometer works whenever it wants to.


Wire to sender becoming shorted will peg the gauge. Speedo likely unrelated. Check connection at transmission.

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Oil pressure gauge pegs at 80 PSI as soon as you turn the key on. I have replaced the gauge and confirmed the sending unit is working properly. Any ideas on where to look next?


Sounds like a grounded wire. Most senders change resistance to the ground circuit of the gauge. If it pegs there is no resistance to ground and probably a shorted wire.

Dec 31, 2013 | 2003 Chevrolet Silverado 1500

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I have a 2005 Silverado 5.3 L, the oil pressure gauge is pegged. When the engine is not running is goes back to 80.


i want you to do this , UN connect the oil pressure switch and let me know if this way can fix your gauge problem .

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2 Answers

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

1 Answer

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Check wiring to sensor on motor clean or replace.If that is OK.then consider: older high mileage cars will start to ware their bearing and causing more back pressure under load, you may have to live with it. Unless you what to rebuild motor.

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Most likely cause is a faulty oil pressure sending unit.

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