Question about Jeep Grand Cherokee

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Noise and High Pressue

I started my 2000 Jeep Grand Cherokee up this morning and heard a rattling noise and the oil pressure gauge read high (80). When I accelerate in neutral, the noise increases and when I accelerate in drive, the oil pressure floats from 40 to 80 which hasnt happened in the past. Not sure if the oil pump is going bad or what. Due for an oil change so I would plan on replacing the pump when I change the oil, if that is a possibility. The noise is what is confusing. Maybe 2 different issues?

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  • Jeep Master
  • 20,706 Answers

Sounds like dirty oil clogged the oil pressure relief valve to me.
its stuck fast closed. bad deal that.
no engine option stated, so dont expect , accurate answers.

Posted on Mar 26, 2014

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Posted on Jan 02, 2017

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SOURCE: 1993 Jeep Grand Cherokee, V6. Oil Pressure Gauge Read High.

it could be the sensor you should look at the oil pressure relief valve

Posted on Jun 10, 2009

  • 2428 Answers

SOURCE: 2000 Grand Cherokee V8: Cold start Oil Pressure is

Replace the oil pressure sending unit its giveing a false reading . The problem is when the engine is cold the oil pressure is low and it takes a little time to build up whem cranking the engine and that sends a signal to the computer PCM /VCM what ever but your 40 to 60 lbs oil pressure is graet its ideal .The unit switches when the oil pressure is high enough to trip the switch inside the sending unit and that is sent to the vehicle control module

Posted on Feb 05, 2011

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What is the correct oil pressure for 2000 grand jeep cherokee larado its about 75 now. i want to buy this car but worried about the oil pressure.


Normal oil pressure should be between 40 and 60 psi. A cold engine will normally have higher pressure. If you're seeing 75 psi on a warm engine I would recommend having the pressure checked with a manual gauge to verify the gauge in the Jeep is working correctly. If the gauge is correct oil viscosity may be too high (oil too thick) or there may be a problem with the oil pump pressure relief valve. If the gauge is not correct the sending unit may be at fault.

Apr 09, 2011 | 2000 Jeep Grand Cherokee

1 Answer

I have a 2000 jeep grand cherokee. When i crank the car, the oil pressure gauge goes all the way over to 80. It stays that way while I'm driving. Sometimes it will drop slightly as I accelerate , but goes...


whistling noise is prob. intake leak or emmissions air flow problem, the oil gauge, is either , oilpump screen clogged, or gauge prob. or if a lot of miles it could be the engine is just getting weak, or oil pump itself. check oil level, and sensor for leaks .

Mar 30, 2011 | 2000 Jeep Grand Cherokee

1 Answer

I just bought a '02 Jeep Grand Cherokee and the oil press. indicator is always on H. I heard the engine during idle making a "clancking" sound which i heard before in cars with the wrong oil type...


I would recommend changing the oil and filter, using the correct oil. It's possible the wrong oil could cause the noise. Wait and see if the oil change has any effect on the oil pressure reading. If it doesn't, change the oil pressure switch or sending unit.

Dec 31, 2010 | 2002 Jeep Grand Cherokee

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Have high oil pressure reading when driving goes down to 55-60 when sitting at light,2000 jeep grand cherokee laredo 2-wheel drive 4.0 litre engine


the 1st thing that needs to be done is have a mechanical oil pressure test gauge hooked up to confirm the actual reading, the electronic gauge many times is incorrect.

Feb 16, 2010 | 2000 Jeep Grand Cherokee

2 Answers

Oil pressure gauge shows 60-80


the oil sending unit that screws in the block beside the oil filter may be faulty,
the worst thing would be the oil pump its self the regulator valve on it

Jan 26, 2010 | 2000 Jeep Grand Cherokee

2 Answers

2002 Jeep Grand Cherokee 4.0L oil pressure gauge reading too high


if the gauge starts a 0 - goes to 1/2 , than full - sounds like gauge is OK - seems to me like the sending unit is bad - you could try removing the sender and trying to clean out the port with "brake clean", letting it dry than re-installing it. the pressure switch is still the least expensive place to start

Oct 27, 2009 | 2002 Jeep Grand Cherokee

1 Answer

I have a 1999 Jeep Grand Cherokee Limited that is making a rattling/ticking noise under the hood and I cannot figure out what it is! We did an oil change and added Rislone, it quieted it some but not...


how many miles on it,sounds like lifter noise which is normal for high mileage jeeps,but if you have over 140k it is not a good idea to run synthetic oils as they are thinner than conv oil and it might start to consume oil.

Sep 26, 2009 | 1999 Jeep Grand Cherokee

1 Answer

1993 Jeep Grand Cherokee, V6. Oil Pressure Gauge Read High.


it could be the sensor you should look at the oil pressure relief valve

Jun 10, 2009 | 1994 Jeep Cherokee

1 Answer

Engine light on/Oil Gauge on stays on high


Any waranties left? Is oil full? Any noises from engine? Did you put a mechanical gauge on it and check "real" oil pressure? (I would not drive it 'till I was sure about actual oil pressure!!)

Feb 25, 2009 | 2002 Jeep Grand Cherokee

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