Question about 2002 Jeep Grand Cherokee

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Oil pressure gauge on my 2000 jeep is on - 2002 Jeep Grand Cherokee

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  • xbrit Sep 28, 2008

    My Oil Pressure goes down to almost zero sometimes when going downhill. I've changed out the sending unit but still it persists. The engines still runs just fine during this, but it is shaking my confidence in the car. Anyone else had this problem?

  • Terry Pearson Oct 12, 2008

    I have actually run into the same problem. My oil pressure is at zero, but no other symptoms are occurring.

    I think it could be the oil pressure sensor.


  • Anonymous Nov 17, 2008

    truck runs great, came to a red light,dropped to zero and check gauge light came on. checked oil fine. checked filter wet. checked oil pressure switch.bad. apparantley this isnt an unfamiliar problem, I went to jeep to buy a new switch and was informed they go all the time on the 99-02 grand cherokee v8

  • lldean Feb 07, 2009

    check gauge kight lit

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The most common problem is a bad oil pressure switch on the 99-02 grand cherokee with the 4.7l v8. The part has failed on 90% of all 99-02 grand cherokees I have worked on. The housing is junk,but since it has lasted longer then 36,000 miles the factory would not issue a recall. The oil pressure switch can be purchased at any outlet. but have found the duralast was decent. that being said Go to autozone and get part # PS471 (oil pressure switch for 1999-2002 N code 4.7L V8.) chances are if you encounter the same problem after replacement you will need to drop the oil pan and un clog the oil sump.

To replace the switch, under the hood look for the power steering pump on the driver side of the vehicle, to the right and under the p/s pump is the oil pressure switch, If it is wet, its bad for sure, remember to disconnect the battery before service,as not to harm the gauges.

Posted on Nov 17, 2008

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  • 40 Answers

SOURCE: My 02 Jeep runs great but oil pressure reads High all the time

oil pressure sending unit is not working right.

Posted on Mar 08, 2009

  • 6982 Answers

SOURCE: Oil pressure gauge

Low oil pressure is generally caused by internal engine bearing wear, not a "bad" oil pump... Pumps become "bad" when debris from a failed component gets into it, causing damage. (exception being pressure regulator spring/plunger assembly becoming clogged with gunk in engines that do not get proper maintenance; likely not your case)
Were there any tapping noises coming from engine when pressure was low? If not, The most common problem is the pressure sending unit, sending bad info to the warning light. If passage going to it or internal passage is gunked up, this problem usually disappears when oil is changed. sometimes the sender just goes bad, in which case, change it.
To get a proper diagnosis on your problem, have someone put a mechanical oil pressure gauge on it. This will read the actual oil pressure and will tell you a lot about the condition of your engine!
I have never seen a valve job that corrected any oil pressure problem. I mistrust anyone who would even think that!!!
Mlinimum low pressure at idle is 15 psi Max is about 60psi running (higher can explode an oil filter) A reading of 15psi indicates the beginning of a problem. although considered "safe" it is not good.

Posted on Jan 03, 2009

  • 1118 Answers

SOURCE: High oil pressure reading

Oil sending unit bad. Replace.

Posted on Mar 01, 2009

Molson02536
  • 3854 Answers

SOURCE: Oil pressure gauge drops after running and sitting still

The Oil pressure sensor seams to have gone bad and needs to be replaced soon as possible as they tend to leak oil soon after. There common to go bad and start with that since it's easier then replacing the oil pump, but if you don't hear any ticking from the engine and you have good pressure when the engine is cold then it's the sensor. 
The 4 cylinder oil pressure switch is located below the A/C compressor. It is a single wire connection with a gray/yellow striped wire. 

The 6 cylinder oil pressure switch is located on the passenger side rear of the block. It is a single wire connection with a gray/yellow striped wire. 

Good luck and hope this helps. 

Posted on Jul 01, 2009

  • 7353 Answers

SOURCE: 2006 Yukon Denali, oil pressure gauge malfunction

Most likely the oil pressure sensor is bad. Its located in the very rear of engine on top of bell housing area.

Posted on Oct 30, 2009

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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1 Answer

Check gauge light on and oil gauge to 80


i think the oil pressure relief wall is abnormally tight resulting relief occurring at high pressure.oil pressure gauge needle position might have disturbed

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Hi Guest,

This is normal. As the engine rev's higher the oil pressure goes up, revs lower, pressure lower.

Jeeps just use a more sensitive gauge than most.

Best regards
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Jun 16, 2010 | 2000 Jeep Grand Cherokee

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Why is oil gage reading 60? does this mean I need oil?


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Apr 11, 2010 | 2000 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


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Feb 16, 2010 | 2000 Jeep Grand Cherokee

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My 2000 jeep grand cherokee was making a faint grinding sound, that got louder anmore clear to make out. It wouls get louder as trie to pick up spee, and I wouldhave go slower and slower each time, I check...


Your engine may be junk now. First, get the oil pressure tested with an external gauge to verify that it is low, and that your oil sending unit or vehicle gauge isn't the problem.
Low oil or pressure wears out crank bearings, which destroys oil pressure.

Feb 06, 2010 | 2000 Jeep Grand Cherokee

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Jan 26, 2010 | 2000 Jeep Grand Cherokee

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Oil pressure loss


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Dec 05, 2009 | 2000 Jeep Cherokee

1 Answer

Oil gauge fluctuates back and forth. sometimes


You'll need to determine if the oil pressure is actually changing, or if the sending unit or gauge is lying to you. Be certain the oil level is up to normal, then check the actual oil pressure with a test gauge. If the pressure varies (drops) at engine idle, perhaps your pressure bypass is defective, or perhaps the oil pump is worn. Testing with a known good pressure gauge should lead you in the right direction.

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Sep 03, 2009 | 2000 Jeep Cherokee

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