Low Oil Pressure - Stop Engine
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Low Oil Pressure - Stop Engine in Past Cadillac Vehicle Discussion; While driving a few minutes ago I got the following on my dash "Low Oil Pressure - Stop Engine". I ...
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    osu411yamaha is offline Banned
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    Low Oil Pressure - Stop Engine

    While driving a few minutes ago I got the following on my dash "Low Oil Pressure - Stop Engine". I had just left and was only a block away so I went ahead and drove it home. I checked the oil and it was low, but not gone. It is about halfway between the low mark and the end of the dipstick. It is not leaking at all. I ran the codes and nothing related pops up. Any ideas?

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    00 Deville's Avatar
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    Re: Low Oil Pressure - Stop Engine

    Welcome back yamaha... most likely cause would be the low oil pressure switch... they have been known to fail quite often. It's located on the oil filter adapter... new one costs about $8 and takes about 30 minutes to replace.

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    osu411yamaha is offline Banned
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    Re: Low Oil Pressure - Stop Engine

    Thanks 00Deville. Is it safe to drive it for a few days if it is the switch or does it need to be replaced immediately? Also, do the switches usually not shoot a code?

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    Re: Low Oil Pressure - Stop Engine

    Quote Originally Posted by osu411yamaha View Post
    Thanks 00Deville. Is it safe to drive it for a few days if it is the switch or does it need to be replaced immediately? Also, do the switches usually not shoot a code?
    When my switch failed it failed in the opposite position as yours. It showed good oil pressure all the time. The only way I knew it was bad was because it was throwing a code.

    When it fails in the low oil pressure position like yours has... it displays "Low Oil Pressure - Stop Engine" I don't believe the car has the ability to know the switch is bad to throw a code when this happens.

    Switch failure is quite common... actual low oil pressure is not. If you are confident that you have good oil pressure... it's safe to drive the car... but fix it has soon as you can. If your wrong.... it will be an expensive lesson.

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    osu411yamaha is offline Banned
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    Re: Low Oil Pressure - Stop Engine

    How can I know if I actually have low pressure or if its just the switch? Also, does the switch actually increase the pressure by switching on and off or does it just tell you when you have low pressure?

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    Re: Low Oil Pressure - Stop Engine

    The only way i know of to be sure that you have good pressure is to put a manual gauge on it. But if your going to do that it would be just as easy to replace the switch. The switch only tells you that you have low pressure.

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    Re: Low Oil Pressure - Stop Engine

    Here's a picture of the pressure switch. On my Deville it was partially hidden by a metal plate but still fairly accessible. You might try lightly tapping on it to persuade it to start working again until you can replace it.



    switch oil.gif

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    osu411yamaha is offline Banned
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    Re: Low Oil Pressure - Stop Engine

    How much oil flows out when the switch is removed? Im thinking about changing it tomorrow, but its parked at my apartment and I dont want to make a mess in the parking lot.....

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    Re: Low Oil Pressure - Stop Engine

    I did mine during an oil change. I can't imagine more than 4-8 ounces coming out most of the oil will be in the pan. I would go with an AC Delco switch if you can find one.

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    Re: Low Oil Pressure - Stop Engine

    The FSM calls out a torque value of 12 ft lbs... I didn't use a torque wrench when I did mine. The switch looks fairly fragile... like it could be easily broken if you put too much torque on it.

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    kdcing is offline Cadillac Owners Fanatic
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    Re: Low Oil Pressure - Stop Engine

    Quote Originally Posted by osu411yamaha View Post
    While driving a few minutes ago I got the following on my dash "Low Oil Pressure - Stop Engine". I had just left and was only a block away so I went ahead and drove it home. I checked the oil and it was low, but not gone. It is about halfway between the low mark and the end of the dipstick. It is not leaking at all. I ran the codes and nothing related pops up. Any ideas?
    If the oil level is between the low mark and the end of the dipstick, then the oil level is low by about 1.5 - 2 quarts. On my 4.9L, the same message "Low Oil Pressure - Stop Engine" appears when the oil level drops a bit below the low line.....and is fixed by simply bringing the oil level back up to the proper level. Add oil before changing the switch.

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    Re: Low Oil Pressure - Stop Engine

    Quote Originally Posted by kdcing View Post
    If the oil level is between the low mark and the end of the dipstick, then the oil level is low by about 1.5 - 2 quarts. On my 4.9L, the same message "Low Oil Pressure - Stop Engine" appears when the oil level drops a bit below the low line.....and is fixed by simply bringing the oil level back up to the proper level. Add oil before changing the switch.
    The N* has a float type sensor for indicating low oil level that sets a "Low Oil Level" message at about 2 quarts low.

    The "Low Oil Pressure - Stop Engine" message is set purely by oil pressure. I've never heard of a N* that holds 7.5 quarts of oil displaying a "Low Oil Pressure - Stop Engine" due to being less than 2 quarts low.

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    iowasevillests is offline Cadillac Owners Enthusiast
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    Re: Low Oil Pressure - Stop Engine

    As was just said, if your oil level is below the low mark, the first thing you need to do is fix that! Then start worrying aoubt what it takes to replace the pressure sensor.

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    osu411yamaha2 is offline Banned
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    Re: Low Oil Pressure - Stop Engine

    Yes, I agree that obviously the first thing to do is add oil. I have got the "low oil message" before and not got the "low oil pressure" message, though. Anyone ever heard of the oil pumps actually going out on these cars? It has 113k miles.....

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    Re: Low Oil Pressure - Stop Engine

    Driving the car with “Low oil pressure” warning is like betting $3500 on black. It could be black it could also be red. Are you ready for that? How much you lose by parking the car until you fix the switch (over $3500)?
    Now 00 Deville was spot on, 2 sensors, and two different messages:
    1) Level switch witch shows the concerning “Check oil level” message (when you are ~5.5 quarts)
    2) The oil pressure sensor witch shows THE MOST CRITICAL message you can see on your dashboard “Low Oil Pressure - Stop Engine”. Even tells you what to do STOP ENGINE period.
    Now yeah chances are some how in your favor since the oil pump was proved to be extremely reliable while the sensor not, but even so would you risk the engine?

    The level you described will not even trigger the level switch. You will have a “check oil level” message for long time on your dashboard before seeing the “Low Oil Pressure” message due to oil starvation.
    Park the car until you change the switch and then go from there (I assume you don’t have a handy oil pressure gig).

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