Oil pressure gauge is at 0, mechanic says to replace the whole engine - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net! Rainier, Bravada, Ascender, and 9-7x owners welcome too!

You are currently viewing our site as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to search and post topics, communicate privately with other members, respond to polls, upload content, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Join Today!
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

TrailVoy.com is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
  #1  
Old 08-06-2018, 11:20 AM
Catastrophic Catastrophic is offline
Junior Member
 
Join Date: Aug 2018
Posts: 1
Arrow Oil pressure gauge is at 0, mechanic says to replace the whole engine

So my dad's 2003 Envoy has been over heating for a while, but about 2 weeks ago the oil pressure gauge was going low, so he took it to a mechanic, who changed the oil pressure sensor, but when he did, the oil pressure dropped to 0 and stayed there. So he had him change it back, and it's still at 0 and doesn't move.
He then recommended we change the entire engine unit, which I thought was ridiculous.
There isn't any strange noises coming from the engine, and I checked the gauge itself and it seems to be fine.

I really don't know much about cars, but I'm willing to put in the effort.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 08-06-2018, 01:14 PM
princej99 princej99 is offline
Member
 
2008 GMC Envoy SLE
Bordeaux Red Metallic 4.2L I6 4X4
Join Date: Jan 2018
Location: ont
Posts: 383
Quote:
Originally Posted by Catastrophic View Post
So my dad's 2003 Envoy has been over heating for a while, but about 2 weeks ago the oil pressure gauge was going low, so he took it to a mechanic, who changed the oil pressure sensor, but when he did, the oil pressure dropped to 0 and stayed there. So he had him change it back, and it's still at 0 and doesn't move.
He then recommended we change the entire engine unit, which I thought was ridiculous.
There isn't any strange noises coming from the engine, and I checked the gauge itself and it seems to be fine.

I really don't know much about cars, but I'm willing to put in the effort.
hi,

and welcome.

does your truck have any other symptoms? check engine light? poor performance?

gauge at zero, could be your stepper motor in your gauge cluster that is failing, common issue in older envoys, 2003-2004

you need to check the oil pressure with a mechanical gauche, borrow one from autozone or a similar place. to see if its a instrumentation issue or an engine issue.

but definitely take it to another mechanic and get a second opinion.
Reply With Quote Quick reply to this message
  #3  
Old 08-08-2018, 07:53 PM
JAL2 JAL2 is offline
Junior Member
 
2004 GMC Envoy SLE XL
Black 4.2L I6 4X4
Join Date: Jun 2015
Location: Seneca, SC
Posts: 7
You didn't indicate which engine your dad's Envoy.
The 4.2 L6 pressure sensor is an on-off switch set to a given pressure, with the computer adjusting the oil pressure gauge based on the engine RPM.
The V8 has a true pressure sensor which the computer uses to drive the gauge.
If the old switch has oil past the seal, it's leaking and needs to be replaced. If the gauge worked before, and doesn't now, I would check the connector to ensure it is on correctly, and that the wires were not damaged. The sensor is somewhat easy to reach from the bottom on the L6, but I would have to check where it is on the V8.
I would also check to ensure the new sensor is the correct one, in case it caused an issue with the computer.
Reply With Quote Quick reply to this message
 
  #4  
Old 08-09-2018, 07:22 AM
miketexas miketexas is offline
Member
 
2003 Chevy TrailBlazer LS
Black 4.2L I6 2WD
Join Date: Feb 2018
Location: TX
Posts: 351
Quote:
Originally Posted by Catastrophic View Post
So my dad's 2003 Envoy has been over heating for a while, but about 2 weeks ago the oil pressure gauge was going low, so he took it to a mechanic, who changed the oil pressure sensor, but when he did, the oil pressure dropped to 0 and stayed there. So he had him change it back, and it's still at 0 and doesn't move.
He then recommended we change the entire engine unit, which I thought was ridiculous.
There isn't any strange noises coming from the engine, and I checked the gauge itself and it seems to be fine.

I really don't know much about cars, but I'm willing to put in the effort.
If check the oil pressure with a pressure gauge you will know in the engine has pressure or not.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Tags
envoy, oil pressure gauge, oil pressure sensor, over heating

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register.

Please enter your desired user name, your email address and other required details in the form below.
(Only letters, numbers, dashes and underscores are permitted for user names)
The user name that you choose is permanent and can never be changed.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live (ex: Philadephia, PA)
Vehicle Year
Choose your year
Or enter your choice here:
Vehicle Color
Choose your factory color (Custom, Not Listed & Two-Tones; Use Text Field Below)
Or enter your choice here:
Vehicle Make
Choose your make
Or enter your choice here:
Vehicle Model
Choose your model
Or enter your choice here:
Vehicle Engine
Choose your engine
Vehicle Drivetrain
Choose your vehicle drivetrain
Security Question
Fill in the blanks: Tra___oy
Insurance
Please select your insurance company (Optional)

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


» Sponsors

Advertising Info

All times are GMT -4. The time now is 09:29 PM.


Chevy TrailBlazer and GMC Envoy Enthusiasts - Copyright 2004 - 2009 All Rights Reserved.
All trademarks referenced herein are property of their respective owners.
RSS Feed