Change oil pump, 3x changed oil sensor, oil is changed

Asked by Avalanche2011kev Feb 14, 2020 at 01:07 PM about the 2011 Chevrolet Avalanche

Question type: Maintenance & Repair

I have changed the oil pump 3x the sensor and oil
changes and my low pressure light keeps coming
on Mechnic is baffled

32 Answers


Did he run an actual oil pressure test at full operational temperature? Like stated above possible excessive bearing clearances.

I will ask I’m taking the truck tomorrow. I guest not stop dealer the truck only has 65,000 miles purchased brand new


Nope don't try the stealership they only want your money. Try a good local independent shop, one that is ASE certified, you will get more bang for you buck at one of those that you ever will at a dealer. HTH

Thank You, I’m going to suggest the bearings to him. I’m driving now and its ringing low pressure.i have 88 % oil life in the truck


Do you know how to install a analog gauge? If not then don't drive it as you could blow the engine. Have it towed to your favorite shop.

No I don’t. This was happening before that’s why I had to have everything changed. He didn’t change the gauge. I hope it’s the bearing and it’s not expensive


You better hope it’s not the bearings cause that will be expensive to fix. I’m just wondering if it is something in the oil sender passage that is blocking the pressure, like there was with the 5.3 in the early years.


It does sound like your mechanic is in over his head.

I will let you know tomorrow.

Had similar issue on my 07, it ended up being a corroded connection somewhere along the wiring going to the oil pressure switch. Couldn’t tell you exactly where...didn’t ask much questions as my Mecanic didn’t charge me for it.


I agree. This sounds like an electrical problem of some sort. Bad wire, bad sending unit, a sensor of some sort. If you've replaced the oil pump 3 times, (and why on earth would you do that??) and if the engine isn't clattering, then you know its definitely not the oil pump and the engine has adequate oiling going on to run safely. Find a shop that specializes in tracking down electrical issues and I'm pretty sure your troubles will be over.

Good afternoon, I didn’t change the pump 3x I changed the sensor 3x no charge. My cousin recommend a electrician. I took the truck Saturday back to my mechanic he told me to bring it back Tuesday so he can go threw everything again. So far the low pressure light and noise did not come on.

My cousin said he’s expensive. I wish I knew where to look.


I'm glad to hear the repeated parts replacements didn't come out of your pocket. Sounds like your guy might have got it fixed. Yes, hiring a professional is expensive, but often a few dollars spent on professional help saves hundreds over trial and error attempts by people who are just guessing at the problem. Hope you're truck is fixed now.

No not fixed took it the the electrical guy he kept it over night and said I need a motor charged me 100.00 And suggested A company To me for a new motor. My mechanic said I don’t need a motor. But now the dinging noise from the low pressure is on all the time before it was when I stopped at lights or slow traffic it would stop when I step on the gas.


Did anyone even test the actual oil pressure using a manual gauge? That is the first thing they should have done, if the actual oil pressure is still low after the oil pump assembly has been replaced then for sure the engine has bearing clearance trouble, if it is ran too long like that it will become a major engine replacement.

The electrician did do the Manuel gauge test


If that was at idle speed it’s too low for the stock pressure sender and the low pressure warning. It should be really close to 25 at idle full operational temperatures. So it does indeed sounds like bearing problems. So the engine has already suffered some damage and will no doubt need some major work soon you can get by a little longer by adding some Lucas Oil Treatment, but make sure you get the one for late model engines, not for the earlier ones or you can mess it up. That should help with idle speed oil pressure for a while and maybe even turn off the warnings. HTH

The electrician told me he could get me a deal on a re-built engine might get 7-10 yrs out of it. but I’m not sure about that. I was told to get a second opinion. Only 68,582 miles on the truck GMC/CHEVY NO MORE


Yeah the older ones were better. I really think that 2005 was the last of the good ones.

What do you think about the re-built engine


At least you will have a warranty for a while. Plus you have a rebuildable block so you will have the core charge. With that low mileage on the rest of the rig it should last you a long time. Just make sure everything else is in order, radiator, tranny, etc. make sure they put on new parts not just swap on your old ones like the water pump, hoses, belts, spark plugs, filters and so on.


I agree. If the truck is in good shape, which it should be with low mileage like that its totally worth putting in an engine. If you're not keeping it long a used one will be fine. If its a long term driver for you then a rebuilt or crate engine would be worth while. Don't dump too hard on GM. These trucks routinely go 150,000 - 200,000 miles with very little problem. Unfortunately you got a bad one. I say fix and enjoy. They're great trucks.

Oh this is my second GMC had an Arcadia with the same problem after oil changes


Ouch! Well I understand your sentiment after having bad luck with two GMs. I've had lots of them with a bunch of different engines and except for two, (and one of them was my fault, not GM's) I've routinely put 150,000 miles and over on all of them. Whatever you decide to do I hope this one ends up better for you.

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