"Oil Pressure Low" "Stop Engine" warning at idle - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 01-28-2010, 08:02 AM
in_titusville in_titusville is offline
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2002 GMC Envoy SLT
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"Oil Pressure Low" "Stop Engine" warning at idle

When at a stop or at idle while in drive I get a "Oil Pressure Low" "Stop engine" warning and the pressure guage goes to 0. If I give a little throttle it goes away and the pressure guage goes up. I'm guessing it's a sensor problem and it looks like there are 2 sensors, one near the oil filter and one in the oil pan. Any idea what's the cause of this warning and how to correct the problem.?
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  #2  
Old 01-28-2010, 02:42 PM
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the roadie the roadie is offline
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Does your idle RPM stay steady, or fluctuate?

Have you replaced your battery recently?

How many miles?

Does the problem go away if you turn off the AC compressor?

More than 90% of the folks with this problem just need a simple throttle body cleaning to keep the RPM steady at 600 RPM. Some owners need to do the process every 30K miles. If you're up at 100K or more and it's never been cleaned, you'll find the backside of the throttle body is as dirty as the inside of an original 1880 Dodge City saloon spittoon.

http://forums.trailvoy.com/articles....ticle&artid=91

If you're idling normally, the sensor is just the one near the oil filter.
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  #3  
Old 01-28-2010, 02:49 PM
WOOLUF1952 WOOLUF1952 is offline
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The sensor in the oil pan is for the oil level. IIRC, 2002 was the only year for that.
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Old 01-28-2010, 04:07 PM
in_titusville in_titusville is offline
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Quote:
Originally Posted by the roadie View Post
Does your idle RPM stay steady, or fluctuate?

Have you replaced your battery recently?

How many miles?

Does the problem go away if you turn off the AC compressor?

More than 90% of the folks with this problem just need a simple throttle body cleaning to keep the RPM steady at 600 RPM. Some owners need to do the process every 30K miles.
Didn't notice the RPM but did notice the brake peddle goes to the floor when this happens.

The battery was replaced 3 weeks ago.

This is a 2002 with 185,000 miles.

I will try with A/C off next time it happens.

I cleaned the throttle body about 1 to 1 1/2 months ago.
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  #5  
Old 01-28-2010, 06:52 PM
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RayVoy RayVoy is offline
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Probably the pressure switch, the one near the filter. It's becoming a common problem.
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  #6  
Old 02-04-2010, 07:11 PM
mtritt mtritt is offline
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I JUST has a similar situation. Was driving and the oil pressure gauge start flapping around wildly from 0 to 40 back and forth and up and down and everywhere. A light came on that said Low Oil Pressure and then - STOP ENGINE. I was at a light, so I turned the engine off. When the light turned green, I started up the truck and the same thing happened. I pulled the car over, checked the oil in the engine - Full. A couple hours later, I started it up and drove it for about 10 miles - nothing. No issues with the gauge, no light, no STOP ENGINE.

The RPMs stayed constant, so from this thread, I guess it's the pressure switch beside the oil filter.

Is this a difficult DIY fix? Anyone got a part number for the switch?

Thanks!
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  #7  
Old 02-04-2010, 07:18 PM
mtritt mtritt is offline
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I think I found it at Rock Auto. Looks like a bolt with a connector on at the end, correct?

Is this easily changed?

Thanks, guys!
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Old 02-25-2010, 09:47 PM
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D-E-N-A-L-I D-E-N-A-L-I is offline
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I just recently experienced the "low oil pressure, stop engine" message too while driving, after searching on the forum I learned about cleaning the thottle body and for some of you it seemed to have worked. I cleaned mine and so far the CEL shut off and oil pressure gauge seems normal, you know I repaired computers a few years pre 9/11 and one of the things I learned about troubleshooting electronics is to start with the simple, disconnect and reconnect connections because after a period of time the two metal connections having current flow through them will always, very minutely, will have some sort of electric residue build up and cause it to make a bad connection. So I don't know if removing the connectors thats associated along the way with the cleaning of the TB did it or the combo of cleaning the TB and disconnecting wires did. But it's working, thought I share maybe a first step in troubleshooting and saving a headache or just another day getting dirty(yeah)

my $.02
Thanks

....your not living unless you enjoy your truck....
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  #9  
Old 07-11-2012, 08:52 PM
pjsantospolo pjsantospolo is offline
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Unhappy Trailblazer 2003 Low Oil Pressure Stop Engine High Temperature

Hi:

I have a 2003 Trailblazer 4.2 with 102,000 miles. I am getting the following symptoms. Enclosed steps to reproduce the problem:

- Start Engine and everything is normal with air conditioning on,
- After I ride for some 15 minutes and get traffic, the vehicle start to low rpm below 600.
- Then, I start to receive message of "Check Gauges". When I look, I see that oil pressure is below 40 psi and drops to 0. Then, the message center says: "Stop Engine - Low Oil Pressure".
-Then, I put it in Neutral and idle a little bit. After this, the RPMs start to rise, oil pressure gauge reads 40 or little bit more, and no more message.
-Oil Pressure sensor changed about 4 month ago after I started to see these symptoms.
-I turn off the air conditioning and there is no change.
-One time I got this issue and at some moment the temperature started to rise to 230 and I start to hear the coolant reservoir bubbling like boiling water.

Any clues?

My wife usually use this vehicle and she is driving me crazy getting frustrated with this. I am trying to solve on my own prior to go to the dealership. Help!!
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