2004 Trailblazer Oil Pressure Gauge
Mike

Ames, IA

#21 Jan 22, 2011
I was about to order a new oil pressure sending unit for this vehicle, kind of expensive at $70 or so and the parts place says "special Order NO RETURNS".
So now I am reluctant to do so. The computerized readout of "oil life" which i had THOUGHT was supposed to be a more "real indicator" of the condition of your oil, now I don't know. It never has indicated a problem. I always change the oil when it gets close to 25% even if that is sooner than needed or 3000 miles which ever comes first.
But the pressure gauge has started pegging at the high end. It used to go just to 3/4 or more (which I knew was BS) but now it pegs.
Has anyone has any luck replacing the sending unit before I buy this pig in a poke and find out it won't help? Like others, high mileage (120k) but I like the vehicle even at 15.6 mpg.
ron

Skowhegan, ME

#22 Feb 9, 2011
i have a 02 trailblazer at idle oil pressure is at 40 drive down the road at about 50 then the gauge will drop down by the 0 mark then comes back up to normal does that 3 or 4 times then it 0's out. shut the truck off then start it oil pressure is fine till you drive down the road starts all over.
shortie30

United States

#23 Feb 11, 2011
Hey Everyone I have an 02 trailblazer LT and i love it...but lately my oil pressure gauge goes from nrmal 40ish to and back to 40sh then eventually stays at 0 I swear I know when it will happen because theres this noise on the passeger said almost like a gurling noise but no one else hears it. Any ideas?
keith

Durand, MI

#24 Feb 14, 2011
your oil screen is clogged. you need to drop the oil pan and clean the screen in the trail blazer the screen is very small and if you dont use a qulity oil and change it oftem you will have this problem. I just went through it with mine.It spun a bearing and the screen was completey clogged,I went to a local wrecking yard and purched a core motor to rebuild I took It apart and the screen was clogged in it. also and under the valve cover was covered with muck just like mine but there was nothing else wrong with the motor So I cleaned it all up replaced the headgasket and am installing it as I speak
keith

Durand, MI

#25 Feb 14, 2011
the reason it goes back up after you shut it off is that some of the debris that has finished clogging falls back to the bottom of the pan .then you start it back up and after a few minutes it finds its way back into the screen and the oil pressure drops again .if you continue to run it like this you will do massave damage to the engine
MIKE

Ames, IA

#26 Feb 14, 2011
If you read this entire post from start to finish you will find that Chevrolet used the "crash" to avoid fulfilling numerous complaints about their instrument panel failing. They are ALL defective to one extent or another. There is an ad onhere somewhere from a guy named Mr. Speedometer. I advise you contact him and give him your details. He is an honest person who will give you an honest reply.
This does not mean that I think you Should have to PAY to have a DEFECTIVE cluster replaced. I don't care how old the car is, this type of poor performance from an otherwise GREAT vehicles makes Chevy look bad. I would have issued a blanket recall for anyone who has a DEFECTIVE instrument cluster but they felt otherwise.
For me? Mine is an 04 and not worth the effort. As you say, the oil condition sensor works fine. If you really feel you have oil pressure problems and are worried about it either buy a 2nd party add on (cheap) at any auto-supply or contact the company I mentioned above.
Otherwise, so what I do. Ignore it. Change the oil at regular intervals as you should and enjoy the rest of the life of the vehicle. But if it really bothers you check with Mr Speedometer.
MIKE

Ames, IA

#27 Feb 14, 2011
By the way, the defects in the instrument cluster are NOT just linked to the oil gauge. Wait till your speedometer, alternator and tach start acting up to those are in separate posts but they all go back to a poorly made part from GM
Jeff -Jacksonville Fl

United States

#28 Mar 7, 2011
keith wrote:
the reason it goes back up after you shut it off is that some of the debris that has finished clogging falls back to the bottom of the pan .then you start it back up and after a few minutes it finds its way back into the screen and the oil pressure drops again .if you continue to run it like this you will do massave damage to the engine
How difficult is it to clean the smart screen?
Jeff -Jacksonville Fl

United States

#29 Mar 7, 2011
Chevy 02 having problems with guage light coming on and oil gauge going to 0 while idleing. How difficult is it to clean smart screen? Also how can we get Chevy to regonise these problem?
shortie30

United States

#30 Mar 11, 2011
keith wrote:
your oil screen is clogged. you need to drop the oil pan and clean the screen in the trail blazer the screen is very small and if you dont use a qulity oil and change it oftem you will have this problem. I just went through it with mine.It spun a bearing and the screen was completey clogged,I went to a local wrecking yard and purched a core motor to rebuild I took It apart and the screen was clogged in it. also and under the valve cover was covered with muck just like mine but there was nothing else wrong with the motor So I cleaned it all up replaced the headgasket and am installing it as I speak
Hey Keith thanx for the idea i will definitely do that next we changed the camshaft actuator soleniod and so far so good but you suggestion is next
Manuel

Clovis, CA

#31 Jul 19, 2011
Hi all, I also have a trail blazer (2004).

Problem 1: My RPM meter was also going crasy so I got it repair at the shop(luckly it was under warranty)

problem 2: I been having the same problem like many of you with the Oil preassure gage fluctuating down to 0, up to idel at around 40 to 45 and sometimes to the max.. at 80.

Problem 3: Ramdomly the car looses power to the point where it is practically bearly moving. It starts working fine if I turn off the engine and then restart it.
Jerry

San Antonio, TX

#32 Jul 21, 2011
Manuel wrote:
Hi all, I also have a trail blazer (2004).
Problem 1: My RPM meter was also going crasy so I got it repair at the shop(luckly it was under warranty)
problem 2: I been having the same problem like many of you with the Oil preassure gage fluctuating down to 0, up to idel at around 40 to 45 and sometimes to the max.. at 80.
Problem 3: Ramdomly the car looses power to the point where it is practically bearly moving. It starts working fine if I turn off the engine and then restart it.
Similar here ...oil pressure goes to zero on TB2004, car loses power. Turn off and restart and everything is OK. Dealer did a "performance test" and "electrical check" and found nothing but acknowleges that the entire insttument panels are notorious for faulty readings and failure. Extended warranty will not cover unless dealer can re-create the problem.
Jerry in SA
What have you found.
Luisanator

Sahuarita, AZ

#33 Aug 8, 2011
I had the same problem. it turned out to be a bad oil pump. it ruined all the valves and lifters, and caused 10 head bolts to be broken because of over heating and burned a 1/2 inch layer of oil anywhere that oil runs. Not Cheap repairs. 800 to have the snapped bolts removed 1400 to have the head repaired. and 900 in parts and about 50 hours of work. And id imagine another 3800 to pay a mechanic to do it if you dont do the repairs your self.
it started happening at about 130k miles on my 02 blazer
Amber

Chaska, MN

#34 Sep 7, 2011
Manuel, Jerry anyone!? Help! I am having the same issues. Has anything worked?
Theresa

Corpus Christi, TX

#35 Oct 26, 2011
I have a 2005 TB. I had the oil changed last week and now the oil pressure gauge is not working. It lays all the way over past 80. When I start hte car it tries to go up past the 80, clicks and then drops again. There's oil, no leaks. What's wrong with it?? How much am I going to have to spend to get this fixed??
Leigh Anne

Fort Scott, KS

#36 Dec 2, 2011
Just another in a long line of defects on these trucks. I am seriously thinking about starting a facebook page to track these issues. There is a govt site and if you look at the numbers reported for all of the instrument panel issues you would think there should be a recall. We had our gas gauge fixed on our own and just recently gm gave owners a 50% reimbursement. Maybe if more owners banded together we could get results? Facebook?
Sherry

United States

#37 Dec 20, 2011
I am all for the Facebook page. This is ridiculous. I have a 2005 trailblazer. The fuel gauge quit working a year ago. Last week the oil pressure started going awry. Same thing that seems to be an ongoing issue with many people that I have read on numerous websites. When stopped at a light the check gauges light comes on and then I get the digital message that scrolls across reading oil pressure low followed by the oil gauge dropping to 0. Today ater getting the low oil pressure message, I got the stop engine message. It amazes me that with all of the ongoing problems, Chevrolet has done nothing to rectify. This is the first Chevrolet I have bought. Even with the fuel gauge and the couple of other parts that I have had to buy, I have loved it, but now I'm thinking I may never buy another Chevrolet, as clearly they don't stand behind their product.

On another note, two years after I bought the truck, I started hearing a rattle in the tailpipe. I took it to the dealer and they told me that it wasn't the catalytic converter but everything past it and that it was going to cost $1, 800 to fix it. I had the extended warranty at that time and they said that it wouldn't cover it. What a waste of money that was. They told me it would be ok to drive it like that and because I didn't want to shell out that kind of money I have driven with it like that for years now. Just wondering if anyone else has had that issue too?
Tianna

United States

#38 Dec 21, 2011
My 2002 trail blazer is doing the same . If it is the same let's get the dealer to show us the recall so we can get help or some money on own trucks free repairs ,something we use these truck , school ,work, trip every
day life
Kim

Houston, TX

#39 Jan 5, 2012
I am SO confused! I just came from the mechanics to get a copy of my insurance so they will give me a loaner car while they change the oil sensor. From what I am reading, it looks like if the sensor is changed out and it keeps doing the same thing then I would be wasting my money?
Jennifer

Richmond, IN

#40 Jan 26, 2012
How much should it cost to have the screen cleaned?

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