Low Oil Pressure - 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 5.3L V8 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 11-16-2011, 01:32 PM
BrianSMerritt BrianSMerritt is offline
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2006 GMC Envoy Denali
Silverstone Metallic 5.3L V8 4X4
Join Date: Nov 2011
Location: Newport News, VA
Posts: 2
Low Oil Pressure

I have a 2006 GMC Envoy Denali with 55k miles. Recently my oil pressure sensor bottoms out to 0. The stop engine warning comes on. Stopping and restarting the engine resets the gauge for about 5 miles. At stops the gauge will bottom out again. There is no noise or change in performance when the gauge goes to zero. The oil has been run less than 4k miles and is not low. Connecting to diagnostic computer does not shed any light. I took it to the dealer. They claimed to not be able to reproduce the problem. It started three days ago and has happened everytime I drive the car. The dealer is doing a second test drive but in my experiences with them they are not very reliable on their diagnosis. Has anyone else seen this problem? If so what are some possible solutions and is there a trouble shooting process that does not cost an arm and a leg?

Side note: I am scheduled for a road trip this weekend. I am nervous about taking the car out of town. It is driving fine but I do not want to do any damage. Opinions?
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  #2  
Old 11-16-2011, 03:33 PM
dcrews dcrews is offline
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2006 Buick Rainier
Silverstone Metallic 5.3L V8 AWD
Join Date: Mar 2007
Location: Wheeling, WV
Posts: 60
Hopefully just a bad oil pressure sender.

The alternatives are not good...

You need someone to hook a mechanical oil pressure gauge to the engine and see what it reads compared to the gauge in the cluster.
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  #3  
Old 11-17-2011, 06:02 PM
BrianSMerritt BrianSMerritt is offline
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2006 GMC Envoy Denali
Silverstone Metallic 5.3L V8 4X4
Join Date: Nov 2011
Location: Newport News, VA
Posts: 2
Dealer diagnosis

Thanks for the info. After the second test drive, the dealer identified it as the oil pressure sending unit. I am having it replaced. Hopefully that will solve the problem.
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  #4  
Old 11-17-2011, 07:56 PM
dcrews dcrews is offline
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2006 Buick Rainier
Silverstone Metallic 5.3L V8 AWD
Join Date: Mar 2007
Location: Wheeling, WV
Posts: 60
woohoo!

That'll be one dealer repair bill you'll HAPPY to pay!!
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  #5  
Old 11-20-2011, 02:39 AM
coolasun coolasun is offline
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2007 GMC Envoy Denali
Black 5.3L V8 2WD
Join Date: Nov 2008
Location: atlanta, Ga
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oil pressure

Quote:
Originally Posted by dcrews View Post
Hopefully just a bad oil pressure sender.

The alternatives are not good...

You need someone to hook a mechanical oil pressure gauge to the engine and see what it reads compared to the gauge in the cluster.
My 2007 is doing the same thing. When i drive at city speeds it the oil pressure bottoms out but when i drive at highway speeds it ok. I will take your advice and have a oil pressure test done
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  #6  
Old 11-20-2011, 10:35 AM
dcrews dcrews is offline
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2006 Buick Rainier
Silverstone Metallic 5.3L V8 AWD
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Location: Wheeling, WV
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Is it making any noises at idle?
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  #7  
Old 12-17-2011, 10:42 PM
Scej79 Scej79 is offline
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2007 Chevy TrailBlazer LT
Black 5.3L V8 4X4
Join Date: Sep 2011
Location: Bradley, IL
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I had the same problem with mine. It wasn't the oil pressure sensor, because I replaced it myself. Took it to the dealer and they had to remove the intake manifold and clean or replace some screen or filter just under the oil pressure sensor. Cost me almost $700. I wish I would have done it myself. I know I could have.*
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  #8  
Old 12-28-2011, 11:16 AM
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Cyclopathic Cyclopathic is offline
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2005 Chevy TrailBlazer LT EXT
Liquid Silver Metallic 5.3L V8 4X4
Join Date: Dec 2011
Location: Olympia, WA
Posts: 23
Same Issues

Changing the oil pressure sending unit did the trick for me. No issues with the oil pressure since. Knock on wood.
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  #9  
Old 01-02-2012, 07:36 PM
minimiser minimiser is offline
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2002 GMC Envoy SLT XL
Bordeaux Red Metallic 5.3L V8 4X4
Join Date: Jan 2012
Location: little rock
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oil pres. fluctuating

I have the same problem. Never shows anything below 40+ lbs while running but usually when you stop it does a sudden nosedive to zero, and I get a stop engine warning...slight speed up and it returns to normal..pressure SHOWS an impossibly quick drop...HOPE it is sending unit.
Whoops...I have the v-8...must have mis-struck the set up button.
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  #10  
Old 01-02-2012, 08:27 PM
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Cyclopathic Cyclopathic is offline
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2005 Chevy TrailBlazer LT EXT
Liquid Silver Metallic 5.3L V8 4X4
Join Date: Dec 2011
Location: Olympia, WA
Posts: 23
Exactly what occurred with mine. I changed the sending unit, and the problem stopped. The sending unit was a bit of the problem to get to, but once it was changed, problem solved. The sending unit is on the top back portion of the motor, closest to the cab.

Easy fix.
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