Replacing Oil Pressure Sensor - 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 02-11-2010, 05:24 PM
alisonsenvoy's Avatar
alisonsenvoy alisonsenvoy is offline
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2003 GMC Envoy SLT XL
Summit White 5.3L V8 2WD
Join Date: May 2008
Location: FL Panhandle
Posts: 11
Replacing Oil Pressure Sensor

My oil pressure guage had developed a mind of it's own, mostly staying pegged to 80 psi. After talking to a buddy who is a GM Tech, he said it more than likely was the sensor.

My mission... change the sensor!

The GM Service manual says you have to remove the intake manifold
because this sensor is buried in the back top portion of the engine. I was able to see it from the side and was able to feel it with my hand, so I figured there had to be another way.

All you need to do is...

Disconnect both fuel lines from the intake and remove the PCV hose. This give you all the room you need to remove the electical plug and get a socket on the sensor.

I removed the OEM sensor with a 6 point 1-1/16" socket, swivel, and extension. It fit beautifully and got it right out.

I had to order a replacement sensor from O'reilly ($45). The BWD brand sensor is taller, meaning you need to use a deep well 6 point 1-1/16" socket. The only one I had was an impact socket that has a very thick wall. It wouldn't fit down over the sensor because of the tight area.

Sooooo, a trip back to the parts store to get Lisle Tool 13250, Oil Pressure Switch Socket. It is a thin walled deep 1-1/16" socket made for these sensors. You might could get a regular, NON impact deep well socket in there, but the special tool was only a dollar more so I got it.

Got everything tightened up, all hoses/lines re-connected and fired her up. No problems, no leaks, no warning lights.

Life is good (until the next thing breaks).
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  #2  
Old 07-23-2010, 06:03 PM
dannygu dannygu is offline
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2004 Chevy TrailBlazer LS EXT
Black 5.3L V8 2WD
Join Date: Oct 2009
Location: Summerville, SC
Posts: 2
Oil sensor access

I have a 2004 Chev. Trailblazer with the 5.3L. I'm thinking it's the same engine? Did you access the sensor from the divers side? I'm looking at it, and found the sensor. But it looks like I need to remove a lot more than just the fuel line and pvc.
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  #3  
Old 02-11-2011, 01:49 PM
MattsEnvoyD MattsEnvoyD is offline
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2006 GMC Envoy Denali
Black 5.3L V8 2WD
Join Date: Jan 2011
Location: Saint Louis, MO
Posts: 2
Replacing the oil pressure sensor

I have an 06 Envoy Denali with the 5.3L. Engine light came on and my oil pressure sensor was maxed out reading 80. Engine light code pointed to the Oil pressure sensor. Looked it up on these forums, and thanks alisonenvoy, your advice was great and made it a lot easier to change than what others were recommending.

Got the sensor at O'Reilly's for about $36.

"the roadie" posted a diagram, on another forum, of the 5.3L that identifies the oil pressure sensor as part #706. Thanks roadie.
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  #4  
Old 03-01-2011, 09:39 PM
ducky406 ducky406 is offline
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2006 Chevy TrailBlazer LS EXT
Black Granite Metallic 5.3L V8 4X4
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i have a 2006 trailblazer 5.3 v8 and the sensor is in the same spot. i was trying to get at it today since my gauge is acting up. i couldn't effectively get to it because of the hoses that alisonsenvoy pointed out.

i went to pep boys and picked up a fuel line quick disconnect tool and a oil switch socket so that i can get to it tomorrow. after getting the socket home i tested it on the new sensor and it DOES NOT FIT.

the socket was made by great neck tools and is labeled 1" - 1-1/16". it is just a hair off from fitting and i was thinking about taking a dremel to the socket, but i may just get the lisle socket instead.

note: i has a hard time finding the sensor on the engine.... if you follow the vacuum line back from the master cylinder to where it meets the intake manifold you will see the sensor directly underneath. easiest to reach from drivers side.

ducky
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  #5  
Old 10-15-2011, 04:54 PM
EDENXL06 EDENXL06 is offline
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2006 GMC Other
Onyx Black 5.3L V8 2WD
Join Date: Mar 2009
Location: Az
Posts: 76
Just happened now

I just started my Envoy and have the same problem freaked me out at first. Turned around and came home, found your thread. Thanks. for advice will attempt to fix now. Is it OK to drive around with it like this as long as I have normal oil level or can it damage something else?
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  #6  
Old 10-15-2011, 05:36 PM
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jimmyjam jimmyjam is offline
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2006 Chevy TrailBlazer SS (LT)
White 402ci Other AWD
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as long as you know your oil pressure really is ok...

I've replaced mine without removing anything, just use a small 1/4" ratchet to break it loose, then a thumbwheel to remove it.
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  #7  
Old 01-30-2012, 10:47 PM
trimblrd trimblrd is offline
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2006 Chevy TrailBlazer LT EXT
Red Jewel Tintcoat 6.0L LS2 V8 4X4
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Location: Springfield, PA
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Would anyone be willing to post some pictures on where to find the oil sending unit on an 06 v8 trailblazer? My guage jumped to 80 today after running normal up until now. It does go to 0 when I shut the truck up so based on the discussions I have seen, I am guessing it is the sending unit. Am I correct?

I would appreciate any help your guys could provide as I have never attempted a repair like this before. Thanks!
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  #8  
Old 02-08-2012, 05:20 PM
nelfort nelfort is offline
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2003 GMC Envoy SLT XL
Pewter Metallic 5.3L V8 4X4
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I have sensor and socket ready but is there a certain precaution to disconnect fuel line from manifold?
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  #9  
Old 03-06-2012, 08:54 PM
Lou Zerr Lou Zerr is offline
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2006 GMC Envoy Denali
Red Jewel Tintcoat 5.3L V8 AWD
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Location: Mayer, MN
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nelfort, were you able to get the fuel line off safely and get it swapped out. My wife's truck has the oil gauge maxed at 80. Just had the oil changed, since we provided the oil I don't think they put too much in and the dipstick reads correct.
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  #10  
Old 01-29-2013, 03:55 PM
biffula biffula is offline
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2002 GMC Envoy SLE
maroon Other 4X4
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Quote:
Originally Posted by jimmyjam View Post
as long as you know your oil pressure really is ok...

I've replaced mine without removing anything, just use a small 1/4" ratchet to break it loose, then a thumbwheel to remove it.

For the archives:


I had to spend 10 bucks on a 1-1/16" deep well socket. It is of course a half inch drive. No way were my 1/2" drives going to fit up in that space. I had to weld a 5" piece long of 3/8" round stock perpendicular onto the drive end. Fit right up in there and worked like a charm. Beat the heck out of taking everything off that GM would tell you to take off. Took 20 minutes to get everything ready, then about 2 minutes to swap out the sensor.
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