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2007 gmc envoy_denali
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17 Posts
Discussion Starter #1
This morning about a mile from my house the low oil pressure / stop engine warning came on. I pulled over and stopped the engine. I restarted it and the warning remained. I returned home and swapped vehicles. I am close to due for an oil change but I know I am not leaking oil. There is no evidence of oil on the garage floor. I will check my oil level when I get home just in case. What might be causing this problem?
 

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2002 gmc envoy_slt
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73 Posts
Nobody knows what is causing that problem. I've had it occur on my truck many times over the past 18 months or so. Seems to happen randomly but usually in stop and go traffic (for me, it may be different for others). I've always been up on maintenance so no issue there. I did change the oil pressure sending unit/sensor about 45 days ago thinking that may have gone bad but the day after I changed it my wife was driving the truck and the warning light came on three times while driving. It hasn't happened since which is interesting, well, not really but it adds to the confusion. Many people have posted the exact same issue here and nobody has found a cure. At least they haven't posted a cure.

If you discover anything leading to the cause of this issue please post your findings. There are many of us here that would like to determine the cause.
 

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2003 chevy trailblazer_lt_ext
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331 Posts
I know this thread is 1 year old (to the day) but I just experienced the same issue.
Low oil pressure warning followed by "shut off engine" in the Display

After reading up on the issue I tried the following
-cleaned the throttle body
-inspected all vacuum connections

The throttle body was pretty clean but had some soot around the butterfly and I cleaned that off.
I put zip straps on all the vacuum connectors to tighten up the connections.

So far, I have gone 2 days without the low pressure warning.

total cost:
45 minutes of my time
.50 worth of TB cleaner
.75 worth of zip straps
 

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2002 gmc envoy_slt
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73 Posts
I've read on there that someone cleaned the little filter located above the oil pressure sending unit. When I changed my sending unit I didn't look to see if there was a filter so I don't know this first hand. Another individual on this site posted that he was going to flush his oil figuring that there is some crap build up that is causing this issue. The flush he was doing drained the oil and then partially filled it with kerosene (but didn't start the engine). Drained that and then flushed some new oil through to remove the kerosene, drained that and then filled it new oil. I never read an update to that posting so I'm not sure it worked or not. Another person said they cleaned the CPAS and said that solved the issue. The good thing to these "fixes" is that none of them cost very much. They may not work but at least they don't do any harm either.

Good luck with finding the problem. It baffled me for years and I never found a solution.
 

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2007 saab 9_7x
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32 Posts
Oil pressure low warning at cold start

Since having the front differential in my 97z 5.3 engine which necessitated removing the oil pan, at every cold start the display reads oil pressure low for a few seconds. Oil pressure gauge goes to normal and pressure is fine during all driving conditions. Lots of engine problems including two rebuilds due to the AFM system in my opinion. Any thoughts on whether something could have been disturbed during the repair? It's making me crazy!
 

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2007 chevy trailblazer_ls_ext
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So I've had a few LS powered vehicles this Trailblazer has the 5300 its an 07 EXT 2wd. I picked it up very cheap because of the loud knocking noise. I was thinking it was a lifter issue until I pulled the pan off. I've been scouring the site for info tons of good stuff found the TSB listing the oil pump pickup tube o-ring failure. the previous owner had just had this thing serviced by Jiffy Lube who put four and a half quarts in the system. Subsequently the motor started knocking very loud he shut it off and traded it to me. as it seems all of the rod bearings are fairly scarffed yet the mains are perfect. #5/6 rod bearings were sitting in the pan. Trust me I know what you guys are going to say but I have check these every which way the crank and rods are perfect still. I have never seen an engine throw bearings and be a simple refresh to repair. They are still in spec. The cause was a bad o ring at the oil pump pick up tube (there is a tsb listed)-(but not listed here?) So I went to my dealer and pucked up new o-ring and standard bearings they are saying I need to run 7 to 7 1/4 quarts of oil (another tsb) and fix the o-ring and I'm golden. So maby you guys should check the O-ring and add oil. This problem also explains the missing oil conundrum people seem to be facing with these trucks? if the o-ring is bad as it sucks air and oil through the high pressure oil pump it will vaporize the oil causing it to go up through the engine through the PCV system
This scenario would also cause a low oil pressure condition even if when you stop and
check your oil it shows full on the stick. Hi I'm new here and this is my first post lol.

:tiphat

burned at a relatively alarming rate compared to any other LS style or any engine with less
than 100k for that matter.
 

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2007 saab 9_7x
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32 Posts
After a week at the dealer and some tests (i.e.) removing the oil filter and connecting a pressure gauge which confirmed sufficient oil pressure I picked it up and have driven it this past week with the "better" oil filter used on the high performance engines. When I park nose down on a slight incline at work the warning message is not displayed at cold start up. Each morning however after being parked in the garage which is level the message has come on all but one day. Dealer agreed to install new oil pump next week thinking that the pump could be getting tired. At 116k miles, really? I'll pay for part they will cover the labor. Stay tuned!
 

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2007 saab 9_7x
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32 Posts
Well the new oil pump seems to have solved the low oil pressure warning at cold start up. How an oil pump can become worn at such low mileage is beyond belief but maybe it was taxed by the two engine rebuilds. Let's see how soon before something else fails. What I have learned on this rig is that preventive maintenance cannot counteract a poor design and poor quality parts.
 

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2007 chevy trailblazer_lt
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4 Posts
desend problem but l did not off engine

l have this problem now

engine not working :drool

what can l do ?:sadcry:
 

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2005 chevy trailblazer_lt_ext
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6 Posts
Again, I know this is an older thread, but I've found out more info on this issue. A lot of people have found that this is caused by the filter under the Oil Pressure Sensor being plugged (this we mentioned above). It's a very cheap part ($5-$10) but I can only find a genuine GM part (no aftermarket). For those that have the issue, I would try this before cracking into the oil pump. I have 154,000 miles on my 05 and I'm going to put a new filter and sensor to see if my issue goes away (much like others, mine only comes on at low engine speed and sometimes after heavy braking). I'll keep people posted if they are interest.
 

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2006 chevy trailblazer_ls
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672 Posts
Well the new oil pump seems to have solved the low oil pressure warning at cold start up. How an oil pump can become worn at such low mileage is beyond belief but maybe it was taxed by the two engine rebuilds. Let's see how soon before something else fails. What I have learned on this rig is that preventive maintenance cannot counteract a poor design and poor quality parts.
Food for thought on this old post ........ 2 engine rebuilds, yet the same oil pump was used ?
 

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2005 chevy trailblazer_lt_ext
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6 Posts
Well, my findings might be delayed... did a fresh oil change with a new wix filter and high mileage full synthetic oil and my oil pressure hasn't dipped below 45psi yet! Maybe the synthetic oil with the additives clean out the screen/filter?? :fingerscrossed:
 

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2004 chevy
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2 Posts
I'm reviving this old post again because my wife's 04 Trailblazer (I6 AWD) has been lighting the oil pressure warning at cold starts. It just turned over 200k miles. I haven't replaced the oil pressure sender yet. I looked for a 'filter' for the oil pressure sender and found these, but not sure if that's what I need, nor where they go. Rockauto calls them oil filter bypass valves, but they appear to have a little filter in them. And why are there two?

Genuine GM Valve Part# 25014612

Genuine GM Valve Part# 25014006

Can anybody provide more details?
Thanks,
Joe
 

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2007 trailblazer_ltz
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1 Posts
I got the same problem

I know this thread is 1 year old (to the day) but I just experienced the same issue.
Low oil pressure warning followed by "shut off engine" in the Display

After reading up on the issue I tried the following
-cleaned the throttle body
-inspected all vacuum connections

The throttle body was pretty clean but had some soot around the butterfly and I cleaned that off.
I put zip straps on all the vacuum connectors to tighten up the connections.

So far, I have gone 2 days without the low pressure warning.

total cost:
45 minutes of my time
.50 worth of TB cleaner
.75 worth of zip straps
But I replaced the the oil pump and a "O" ring and the warning appear again
 

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2006 chevy trailblazer_lt_ext
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1 Posts
I have an 06 trailblazer 5.3 had it two months put about 1500 miles on it since i bought out used,
and I was driving into town and i lost all oil pressure, stopped and checked it, wasn't low on oil, started it kept oil pressure for like 10 seconds, then lost it, I have a knocking on the motor. And metal shavings in the oil! They look aluminum, the block is aluminum! Is the motor trashed or is it rebuildable?
 

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2003 chevy trailblazer_lt
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2 Posts
I have an 2003 chevy tb 4wd LT and one day my son was driving it and it started knocking loud we did an oil change and put some oil treatment in after the oil change and when i took off the oil fliter it was so thick and black , we had it only month and half bought it from an dealer the engine sound good when we first got it, can someone please tell me what can i do my wife was talking about getting another engine put in
 

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2007 gmc envoy_denali
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113 Posts
I would try oil changes every 250 to 500 miles see if it cleans out before I drop a motor in it. Don't use a motor flush I was always told. Im not a mechanic but I was told to add little trans fluid like 1/8 of a cup or less to clean up engine deposits. I would wait to see if someone else who is more engine friendly adds their option first before I do it. good luck
 

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2006 gmc envoy_denali_xl
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7 Posts
Same issue with my 06 Envoy decided to rebuild engine

Can anyone tell me a good aftermarket brand where I can buy a rebuild kit for my 06 Envoy 5.3 L engine? grateful if you could send me some brands or links on where to purchase and what to look out for.
 

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So today, about 35 miles from home, my engine light came on and oil pressure gauge was showing low. I have a 2006 GMC Envoy Denali with a V-8. Anyway, I stopped as soon as I could and checked the oil level. It was fine. When I started back up, the oil pressure gauge went to normal, but a few miles up the road, the engine light started flashing. I pulled off interstate into a rest area. When I started the engine again there, it had a clicking sound and bad vibration. I have OnStar so I called them and got it towed to the local dealer. It is sitting there and I guess I’ll find out tomorrow what they say the problem is. I just bought the Envoy in July and I know it has a rebuilt engine. The vehicle has 99214 miles, but the engine significantly less. What could be wrong?
 
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