Question about 1996 Jeep Grand Cherokee

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Oil pressure gauge reads zero - 1996 Jeep Grand Cherokee

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If your engine is still running and not noisy, likely the lead on the sending unit has fallen off or the sender has failed. Check that and do what needs to be done there.(re-connect or replace). If the engine is noisy, do not run it at all and have it checked out immediately. However, likely serious damage has already been done. Also make sure the oil level is full.

Posted on Sep 26, 2009

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Well I assume it still runs if so the oil pressure sensor is bad or unplugged as if you had no oil pressure the engine would seize up within minutes

Posted on Sep 27, 2009

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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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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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If there truly was no oil pressure it would make a horrendous rattle sound from not only the rods but especially the hydraulic valve lifters. It sounds like probably the pressure sensor or the wiring, or both are not reading correctly. The older Chevy V8's had the pressure sensor on the side of the block, under the exhaust manifold where it would just cook it and make it leak and not work right. I always kept a direct reading pressure gauge with hose and adapters in my tool box when I felt I couldn't trust the onboard gauge. Many times it proved the gauges and idiot lights wrong.

Dec 07, 2013 | Cars & Trucks

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.

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Oil pressure gauge reads zero, engine appears to be running fine with no noises what so ever, no oil leaks, oil level is normal.


The oil pressure should be verified by removing the oil pressure sending unit and installing a gauge to take a direct reading. If the oil pressure is ok, the problem is most likely a bad pressure sensor (although it could also be a bad gauge or circuits).

If the gauge verifies that the oil pressure is indeed low, then the oil pan needs to come of for an inspection of the oil pick-up tube and the engine bearings.

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Low oil presure


perform a master oil pressure test. this is done by removing the oil pressure sending unit and installing a oil pressure gauge. if the reading on the test gauge is ok, the sending unit needs to be replaced. if the pressure reads low on the test gauge, there may be excessive bearing wear or you may have worn valve guides. good luck!

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While my truck is running my oil pressure gauge reads full. The gauge zeroes out when you shut the truck off yet it goes up to maximum when I start it again. Nothing seems wrong with the truck. What's up?


The gauge is reading higher oil pressure than it should on the gauge. The gauge has a resistor that is shorting out so a replacement is needed

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1999 Grand Cherokee Laredo V-8


it sound's like you have the wrong sensor for the application

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It plunges down to zero at times then reads eratic


Your oil becomes too fluid as the engine gets warmer. When the engine rotates slower at stops, the oil pump won't make pressure. At speeds, more oil is pumped and the pressure rises.
Have you recently changed your oil? Or maybe is too old. The real problem would be if you read zero at normal cruising revolutions.

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