Question about 2004 Buick Rainier

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Oil pressure low gauge stops car.

After driving 1/2 mile upon start up, display reads " low oil pressure-stop engine!" Mechanic replaced oil pressure sender switch, problem still persists. Car "shuts down" when this happens. One time, the display said " service braking system" instead of low oil pressure, but my car still went into "shut down" mode. It does not stall, but I can't accelerate and need to pull off the road, shut the engine off, then on again. It works fine after that. I have been letting the car warm up for afew minutes before driving to get thetempto normal, but should not have to do this. Also, the "service emmisions system" light comes on sporadically, sometimes for a couple of days, then goes out. Don't know if this is related to the oil pressure thing. I have 45,000miles on the car. The Buick dealership service dept. has no suggestions. They have never heard of this happening before.

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  • Anonymous Oct 07, 2008

    I have an 04 rainier that post low oil pressure then cuts off. you can crank it right back up with no problem.

  • Anonymous Dec 18, 2008

    I have th same problem with my 05. Taking it to the dealer to check the problem tonight. We'lll see what happens.

  • Matthew Evans Jun 04, 2013

    i have the same issue, what was the solution?

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MY 2002 RAINIER DOES THE SAME THING I HAVE BEEN TOLD IT IS THE THROTTLE BODY. I NEED TO CLEAN IT OR REPLACE IT. I HAVE THE 4.2 AND YOU CAN GET ONE FOR $200 PLUS SHIPPING. THE THROTTLE BODY STARVES THE CAR FOR AIR CAUSING THE IDLE, AND SHUT DOWN PROBLEMS. I AM GOING TO TRY IT THIS WEEKEND.

Posted on Oct 04, 2012

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Did you ever find a solution? I have the same exact problem with my 2004 Buick Ranier

Posted on Sep 28, 2011

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Will driving car my low oil pressure light came on said stop engine. stop engine. restart light came on and drove 20 miles did it again . what cause this.

Posted on Jan 04, 2015

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I have a 2004 Rainier as well and she has had about every issue there is. I think these symptoms when I had it was a loose wire to the throttle pedal and then maybe had to replace it after it did it again. I can't remember exactly though as I've had to replace a lot of things and have had numerous issues. It's a love hate relationship though!

Posted on May 10, 2013

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My 2004 Buick Rainier is saying no oil pressure, shut engine down...and then it shuts down. And it has been stalling...the rpm drops and rises while I drive it and when I come to a stop in drive it stalls now...I have to throw it into neutral and it will keep running when I stop...Please help!! It will fire up but just seems not getting the gas or something like that, my engine light is on as well and has been for the past year and this problem only just started 2 months ago.

Posted on Feb 04, 2011

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Has 358000 miles, just had leaks repaired. Twice since my oil pressure gauge reads no pressure but not all the time? Why


1. Oil Pressure Gauge Not Working You will notice this happens when your oil pressure gauge is not reading, whether the engine is turned off, idle or running. Try to step on the gas to rev up the engine. If the oil pressure gauge still doesn't change its reading, your gauge is busted. It's best to replace it as soon as possible because you won't have any idea if your car is already overheating or not.
2. Oil Pressure Gauge Reading Too Low When your engine is idle, the oil pressure gauge will have a low reading. When the engine starts running or when you're already cruising or on the freeway, your gauge's reading should have increased. If it stays on a low reading, then you now your oil pressure gauge is broken.
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It could be
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-stuck over pressure relief valve in the oil pump-worn engine bearings
The first step is to check the oil level, and if OK, have a mechanic take out the oil pressure sender and substitute an oil pressure gauge. Ask for a look at the reading as the engine is run then.

These gauges are cheap enough if you wish to do this yourself, and you can then install it on the dash somewhere.


Often if the engine bearings are that worn, the car will blow blue smoke and consume oil.


In the meantime keep the revs down as much as possible.

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Don't ignore it. An oil pressure warning light (or low gauge reading) means one of two things: either your engine has dangerously low oil pressure, or the oil pressure sending unit that triggers the warning light (or operates your gauge) has failed. I hope this helps.

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2002 trail blazer runs good unil its stopped @ idle (600 rpm) the oil gauge pressure drops off fast and check gauges light comes on followed by low oil pressure read out . If i give a little throtle to 800...


Thank you for being very clear, most of the people on this site write very little or very poorly.

On that note, on to options. It's either (in my expert opinion) an internal engine problem, or your computer/spark plugs needs to be replaced.

Step 1: Get a tune up, (100 bucks) if already done, than I'm proud of you.
Step 2: Go to a mechanic and shell out 50-80 bucks to get a specialized computer hooked up to your car to tell you any and all of the problems with your car.
Step 3: get overcharged by said mechanic to fix it, or do it yourself and grow some chest hair.

Hope it helps.

(excuse the sarcasm, I'm bored at work solving random car problems)

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