Question about 2002 GMC Envoy

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Where is the power steering pressure switch on a 2002 envoy

The power steering pump works great when the engine runs above 2000 rpm. There has never been any evidence of cavitation or sounds coming from the pump. the resevoir is full and I have changed the hydraulic fluid in the system. Also the engine will stall at times and will run like its under a heavy load that will make the low oil pressure warnings appear. Any help or guidance

Posted by Chris Wagor on


5 Related Answers


  • 4 Answers

SOURCE: L Reg Vitara engine knock

if anything id say it was the bearing

Posted on Jul 06, 2008


  • 22 Answers

SOURCE: Low power steering fluid

if the fluid is low it will cause the noise if it is low there is a leak and could have got air in system and cause noise and possibley cause damage to pump and gear box

Posted on Dec 11, 2008


Romel Edmondson

  • 68 Answers

SOURCE: Where is the oil pressure sending unit on 2004 Dodge stratus

Most likely the oil pressure switch may be damaged. This is a simple procedure. Change and observe the results

Posted on Jan 23, 2009



  • 3113 Answers

SOURCE: 2002 Jetta 1.8T random oil pressure warnings

Replace oil pump and use the bigger filter that Vw tells you to. These 1.8's have some oiling problems due to the amount of oil they hold and they want you to use synthetic oil in them.

Posted on Apr 25, 2009


  • 82 Answers

SOURCE: 1995 gmc jimmy... heavy clunking and low kpa oil pressure

It sounds like you have fried your main bearings and possibly your valves .... (you've totalled your engine) You should NEVER EVER RUN YOUR ENGINE WITH LOW OIL PRESSURE .... UNfortunately, this engine is also prone to clogged oil return journals As I found out accelerating up a mile long grade ... with plenty of fresh oil and the radio was up fairly loud until I noticed the knocking and the guage as low as it could go ... Oil was al stuck up under the valve covers and returned into the oil pan and the dip stick .... after the truck was shut off for a few minutes ... but with a knocking motor!

Posted on May 01, 2009

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1 Answer

Check water pump bad

It does sound like the pump and the steering will be fine, the only indication it is going bad will be the noise. Not to worry you won't lose your steering but the noise will drive you nuts, never mind the looks you will get from other drivers, get a new pump.

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Whinning Causes
The whining noise you hear coming from the power steering pump is one of three things. The first is more of a loud "hush" than a whine; this is the sound of fluid rushing through the bypass valve when you turn the wheel all the way to one side or the other. Sometimes the bypass valve malfunctions or doesn't open all the way, causing pressure to back up in the pump and cause your engine rpm to drop. The second and third causes result from cavitation -- vacuum pockets created behind the rotor's vane blades as a result of extremely high pump action -- or air in the lines.

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What is the idling RPM of the engine when this is happening? There are many different types of power steering systems out there these days on vehilcles. It would make it a bit easier if we had a little more information before we give you advice. Year, Make Model, Milage, ect...Any other known issues with vehilce? Yes, the most likely culprit could be the pump because as time goes on the internal pump compoinents start to wear down and the tolerances become to great and at low rmp it cannot keep the proper pressure needed to give adequate power assist to the steering gear.
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Whining sound and lost acceleration. Sounds like noise coming from pully? Whining increases when pressing the gas.

The lost acceleration is of major concern. Maybe you have lost your water pump. It would work great for a few miles when you start out and then gradually heat up and loose performance. The fluid would eventually boil over? Maybe a bearing on the camshaft is expressing it's discontent and causing extra load for the engine to overcome. Try to determine where the noise is coming from.
The serpentine belt connects the alternator, water pump, power steering, front timing pulley, fan, and front timing pulley. All these components generate a parasitic load on your engine. If the engine has to work harder because of increased load it could be any of these components. I'd definitely check the water pump listening for noise while running. Look for obvious things related to the belt and its' components.
Check the serpentine belt for wear. May indicate pulley misalignment or wear. There exists two idler pulleys that have small bearings that wear out and squealing noises. Check those for wobble with the tension off the belt. They are pretty cheap so replace them if any concern at all.
Power steering pumps cavitate and make a high pitch gear whining sound if fluids are low or gears warn of. Check the fluid and top off to the correct level.
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sounds like the pump is going out, check fluid, check belt, usually when u have to run at high rpm like that sounds like the pump is weak, higher rpms turns pump faster making fluid run through quicker, slower rpm fluid not pumping enough fluid to keep pump working, i believe you need power steering pump, if it goes ot while driving, it would be like driving a car from the 40 or 50s. hard to turn, you may even cause a wreck, you could get hurt or somebody else

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Sounds like the Altinator is going out. At higher RPM it is putting out enough power to keep the car running but when the rpm gets below a certain point there is not enough power coming out of it to keep the car running.

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1 Answer

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the sound you are hearing is the pump running out of oil. if you continue to run the engine without power steering fluid you will damage the pump. the best thing to do is to top up the power steering fluid and have the leak fixed as soon as possible. paul

Jul 07, 2009 | 2000 Chevrolet Blazer

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