low oil pressure

I would suspect a faulty oil pump. If pump starts to fail then there will not be enough oil to lubricate internal parts properly. Here are some diagrams (below) on how to do the job.

You will need to pull the front balancer and timing cover to get to the pump.

https://www.2carpros.com/articles/how-a-harmonic-balancer-works

Install the front cover bolts, tightening the center bolt last (1).
Tighten the front cover bolts to 10 Nm (89 inch lbs.)

I would check the oil pump pick up as well because if there is a sludge in the engine it will plug the inlet to the oil pump.

Check out the diagrams (Below)

Please let us know what happens.

Cheers, Ken

i have the same problem. i have had the car at several shops and finally the dealer. i had the oil changed, which helped for a day. i next had the sensor changed, worked for 3 or so days. i had a master mechanic look at it. he ran he engine for an hour and a half on his manual gauge. although the cars oil pressure ran low, he said it never went below spec. he told me the engine was going! no knocks, no noise, no nothing. i finally brought it to the dealer who ean complete diagnostic check. they not only found nothing, they couldn't get the problem to even occur while there. they ended up resetting the computer and since last sept. when i picked it up i have not had a problem. until today. everything else about the envoy is great! i have read that higher viscosity oil may help or even solve the problem in the summer months. this is the first summer i have the car so maybe its the heat. Then I went ahead and took the oil pan off and sure enough sludge. Now clean I have no more problems.

the 2004 envoy has about 128k... thanks

I have a 2005 GMC Envoy, 97k miles; low oil pressure light came on last week; oil changed two days ago; low oil pressure - stop engine light came on again today? They told me it is the oil pump pick up screen. Does that sounds right?

Yes the oil pump pick up gets clogged with sludge not allowing the oil pump to do its job.

Engine Mechanical problem
2003 GMC Envoy Four Wheel Drive Automatic 111000 miles

low oil pressure message flicks on for a second periodocly
no noises or lack of engine performance

is the oil level sufficient? if so then could be a malfunctioning oil sensor or weakening oil pump

Engine Performance problem
2004 GMC Envoy 6 cyl Four Wheel Drive Automatic 100K miles

2004 GMC ENVOY XL 6 CYL which has 100k miles stalls when the air cond or heat is turned on & an low oil pressure light comes on.

if you get low oil pressure it cuts the fuel off. try cleaning the throttle plate as well with choke cleaner as that may be gummed up. it's the first picture under tune up if you don't know what it is..

The Oil gauge will go down to 0 oil pressure when I am at a stop or idling. The oil pressure go up when I'm accelerating. The engine sounds fine and runs fine. I have listen for any other issues but none. i do need a oil change will this cause that problem.

I would check the oil pressure manually with a gauge or you could try changing the sender to See if thats it not uncommon for them to fail.

My warning light is indicating that my oil pressure is low. I thought it may be due to almost time for an oil change and I went and got the oil changed. The light still comes on. It comes on when I am coming to a stop.

You could just have a bad oil sending unit you need to test your oil pressure. Or try replacing the oil sending unit there pretty cheap to see if that fixes it

Hi every one am having problems with my causing car and I was hoping one of you guys can help me .OK the problem is the after I replace the oil pump I started the engine it run real nice for a couple minutes teal I turn it off and crank it back up. started with a noise .I check oil pressure and no pressure .can someone tell me if I did anything wrong I put the oil pump the same way us the old one was. if someone can help me I appreciated thank you an advance.

recheck your work yu may have not put the oring in that goes from pickup tube or it may have damaged pump since you started it. it needs to be prelubed prior to install

I recently had a rebuilt 5.3 l engine put in my GMC Envoy. Bought it from Promar Precision engine Rebuilders, Patterson, NJ. Works great, quiet, no leaks, etc., however, after I drive I to 2 miles the oil pressure gage drops to zero. Motor runs fine, oil ok, quiet, etc. just no oil pressure per the gage. Put new sensor in, no difference.
Any suggestions?

Thanks!
Russ Lane

put manual gauge on it to see what actual oil pressure you have I f no reading on that then take it back. however it may be a bad dash or gauge as they are digital and go bad. they can be rebuilt as well.

Thanks so much for the advise, will get on that this weekend
Will advise!

Russ Lane

2004 GMC Envoy V8 All Wheel Drive

oil pressure very high changed oil and oil sensor changed

Measure oil pressure with mechanical gauge, this will tell you actual pressure. If still high then an oil pump or clogged oil galley.