Question about 2002 Jeep Grand Cherokee

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Just bought a used 2002 Grand Cherokee and the oil pressure guage shows zero on starting till I drive a couple of miles. Just like freesherb in March 2011. Can you tell me what else to do besides changing sending unit?

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If the engine is not making any ticking noise, I recommend replacing the oil pressure sending switch,sensor.

Posted on Jun 09, 2011

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OIL PRESSURE LOW...i CHANGED OIL AND PRESSURE IS FINE UNTIL JEEP GETS WARM AND WHILE IDLEING PRESSURE DROPS TO ZERO AND CHEK GUAGE LIGHT COMES ON.dID THE SAME BEFORE OIL AND FILTER CHANGE.


How many miles are on the engine? Have you tried to replace the oil pressure switch? is the engine making any type of noise due to low pressure reading?

Sep 07, 2011 | 2001 Jeep Grand Cherokee

2 Answers

Oil pressure gauge reads normal when first starts. as it warms up, gauge goes to zero. If I rev engine, gauge goes back to normal.


Two things...when it reads zero, is there any engine noise (tapping or knocking)? After you rev the engine does the pressure read normal at idle and function normally, or does it go back down? Either way, you should not drive the vehicle 'till you have a mechanical gauge (yours is electro-mechanical) put on there and the actual pressure is tested. The condition may be a bad sending unit, a bad bearing or possible obstructed oil pump screen. The repair is obviously different for each one and the price is as well.

Oct 20, 2009 | 2002 Jeep Grand Cherokee

2 Answers

Jeep Grand Cherokee almost overheating!


Check your oil level first and make sure its at the correct level. A couple of things, if your guage is going up it's a bad guage/sending unit are easiest checks. If it goes way up while driving you probably have an oil passage blocked somewhere causing the pressure to spike maybe a spun bearing (lower motor). Does it make any rattling/knocking noise? If not I would get it checked out ASAP, low/high oul pressure can lead to severe engine damage/failure.

Aug 09, 2009 | 2002 Jeep Grand Cherokee

1 Answer

I have a 96 Jeep Grand Cherokee (4 L) with 225,000 miles. When idling and engine hot, oil pressure guage drops to zero. Any way to tell if it is the pressure sensing unit or not?


ook up a external pressure guage where the sending unit is you will know forsure. with the milage i would guess that the oil pump may be the prblem or to much clearance in yhe bearing.

Jun 10, 2009 | 2002 Jeep Grand Cherokee

1 Answer

2004 Grand Cherokee: oil pressure fluctuates


if you know for certain that the sending unit is correct and the guage is accurate, then yiu may have big problems.....while the engine is running open the oil filler hole.. is everything wet with oil? or does it look dry or just a little lubed? you can allways install an aftermarket oil pressure guage(crappy tire) if you get the same results with that then you may have a week oil pump....worst case scenerio... need an engine rebuild as the moter may have wear issues.does the pressure slowly drop as the motor warms up? at idle ? does it jump up when you step on the gas?

Mar 30, 2009 | 2002 Jeep Grand 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

1 Answer

RPM opposite effect on oil guage


how many miles are on the vehicle this usually happens when the oi; pump or engine is wore out.

Dec 13, 2008 | 2002 Jeep Grand Cherokee

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