Question about 2004 Jeep Grand Cherokee

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Check gauge light is on and oil pressure gauge at zero. Oil at full on stick?

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Sounds like you have a bad oil pressure sending unit, the oil pressure sending unit controls your oil pressure gauge, what I would do is remove the oil pressure sender and hook a manual oil pressure gauge up to your engine and verify you have sufficient oil pressure, if you have good oil pressure on your gauge then replace the sending unit, if you have a low reading on the gauge stop your engine immediatly and start looking at a potenial problem with your oil pump or lubricating system within the engine....

Posted on Dec 09, 2010

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If the engine is not making any clattering noise due to no oil pressure to the lifters, the problem may be the oil pressure sending unit or a connection to or at the sender. On the 4.0 engine the
sending unit is on the right side of the engine near the transmission. On the 4.7 it's located on
the lower left front of the engine above the oil filter. Just to be on the safe side, I would screw a
mechanical oil pressure gauge into the sending unit hole to be sure the pressure is good. You
may be able to rent a gauge at a parts store. Or you can have your mechanic do this for you
it's not that big a job. BUT if the engine is clattering have it towed to the shop, you may have
oil pump problems. Hope this helps.

Posted on Dec 09, 2010

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If your engine oil is full its more than likely the oil pressure sending unit good luck

Posted on Dec 09, 2010

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Ran into this problem on my 94 model. changed all three oil sensors before it fixed the problem. check the wire harness for cracks in the connector and the wires.

Posted on Dec 09, 2010

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Posted on Jan 02, 2017

Richard Scordino

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SOURCE: check engine light came on

If there are no tapping or knocking noises when the engine is running, chances are that either the wire on the pressure sending unit has fallen off or the sender itself has gone bad. If you are unsure about if you have pressure or not, you can attach an external test gauge to the engine right where the sender goes. If unsure, best not to run the engine or you can seriously damage it.

Posted on Jan 30, 2011

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1 Answer

I have a 01dodge RAM 1500 and the oil gauge keeps going from 40 to 0 and the check gauges light keeps coming on but I checked the oil and it's fine, what could be the reason for this


1. You need to have an independent oil pressure gauge hooked up to the engine to check the oil pressures at various RPMs and to verify the 40 to zero drop. This will eliminate any issue with the pressure gauge or the sending unit.

2. The oil pressure variation can be caused by an intermittent blockage in the oil pick up or an intermittent sticking oil pressure relief valve. I would possibly suspect the latter if you are getting good pressure and it is intermittently dropping to zero and going back up again..
If you or previous owners have not maintained the engine with frequent oil changes you will get a sludge build up problem in the engine and this will be evident by just dropping the engine sump.

3. If you have had a check engine light warning then you need to have the vehicle scanned to see what fault codes have been generated by the computer. There will be some related to the intermittent loss of oil pressure but there may be others also..

4. You need to have the oil pressure problem checked out immediately. Running the engine when you constantly lose oil pressure intermittently will definitely cause engine damage due to a loss of both lubrication and oil cooling to critical components.

Apr 01, 2016 | Cars & Trucks

1 Answer

How do I check no oil pressure on gauge? The oil pan is full.


First you need to find the sending unit. Some are by the oil filter. Most sending units sink current so by taking the lead off and grounding it you should get a reading on the gauge. This will narrow it down to whether it is the sending unit on the engine or the gauge on the dash. Depending on the car there are a bunch more questions to be asked but this is a general answer.

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2 Answers

Oil light comes on and is dinging.


The oil light has nothing to do will oil level, but rather oil PRESSURE. If the engine oil is full and there is no rattling or banging noises in the engine, chances are the oil pressure sending unit is bad. If noises accompany the light, then shut down the engine and troubleshooting the engines internal lubrication system.

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1 Answer

Oil pressure gauge reading zero


check the oil pressure first, it should read around 10 to 14 psi. If pressure is inside the range then your pressure sensor is bad. If lower or reads 0 psi your got a engine problem, further diagnosis needed. Good luck.

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2 Answers

Oil light flashing


oil light means loss of oil pressure.. not good ..check oil level fill to full if low..low oil pressure will cause fuel pump to be shut off..

Dec 08, 2013 | 2001 Ford Escape

2 Answers

Oil pressure gauge is reading zero


Could be the gauge on the dash. If you really had no oil pressure the engine would be very loud.
A mechanic would check oil pressure with a mechanical gauge to verify.

Jun 17, 2013 | 2006 Chevrolet Tahoe

1 Answer

My check gauges light is on, oil hands goes over to zero, moves up, light goes off, when it drops back to zero, gauge light comes back on.


Well the warning light is supposed to come on if any of the gauges display a dangerous condition, such as no oil pressure.
You may have a faulty sending unit for the gauge, or a wiring problem, or the engine may actually be loosing oil pressure when the gauge drops.
You could replace the sending unit as a test, or have someone check the oil pressure with a mechanical gauge.

Dec 13, 2012 | 2001 Jeep Grand Cherokee

1 Answer

Oil pressure gauge on 1997 jeep wrangler 4.0 is coming in. shows no pressure at zero. changed sending unit, and filled oil to full but still is coming in. also when at 55 or higher mph, pressure is below...


check it out manually with a pressure gauge ,could just be a high resistance or something ,but check with a manual dial gauge and if low check put the oil pump

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1 Answer

2004 Doge Ram 2500 5.7 Hemi 190K mile had oil pressure gauge drop to ZERO and check gauges light come on and engine shut down.. Check oil 1 guart low, add oil. let cool. crank up, good gauges drove home 45...


If the valve lifters are quiet you most likely have oil pressure even with gauge showing "0".Sounds like the oil pressure switch going bad.I would try that first.

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1 Answer

Oil gauge fluccuates,while driving. Indicates zero when stopped at traffic light, then gradually moves up as accelleration increases. The only time I get a normal oil pressure reading is at start-up. Dip...


You should have a manual oil pressure test done but this condition idicates the oil pump is weak or the high pressure bypass is sticking open.

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