Oil pump or something else please help urgent

Asked by Jan 18, 2014 at 11:36 PM about the 2007 GMC Sierra 2500HD 4 Dr Work Truck Crew Cab 4WD

Question type: Maintenance & Repair

I have a 2007 gmc 2500 hd with 6.0 gas
engine.oil pressure gage dropped to
nothing and alarm went off saying low oil
pressure shut off engine.oil is clean and up
to par.no leaks or knocking pinging.plugged
in scanner it says oil pressure sensor.I
replaced sensor and at idle after engine
warms up its doing the same thing.I took it
to get oil change tonite putting 10 W 30 in it
and during oil change I dumped oil filter
looking for metal slivvers or shards in oil
and found none.engine is over 200,000
miles but has highway miles and always
routinely maintenenced.does this sound
like an oil pump?oh,after oil change seemed
to get better pressure but after warming up
dropped super.low again.what is the
problem.thanks.

19 Answers

19,935

Yes oil pump going out or screen plugged up. Replace them both.

4 of 4 people found this helpful.
68,725

Remove the oil pressure gauge sending unit and, for testing purposes, install a mechanical oil pressure gauge. This way you'll know what the pressure really is. Kinda like getting a second opinion at the doctor's office. If the pressure is in realality good check the plug at the oil pressure gauge sending unit and the wiring going to it. For the gauge to drop like that I'm actually thinking of an electrical failure. But if your dash gauge is reading correctly then I'd suspect the oil pump, clogged pick up screen, or sludge blocking an oil passage inside the engine. HTH. -Jim

4 of 4 people found this helpful.
97,125

It sounds like an oil pump, but I had a BB402 that did that to me, it wound up being the cam bearing in the back journal that was causing my problem, as I was that far into it I just overhauled it.

2 of 2 people found this helpful.

I'm with Jim on this one....the sender is sending errant signals~ https://www.google.com/#q=2007+GMC+Sierra+oil+pressure+sender&tbm= shop

4 of 4 people found this helpful.
2,325

crank shaft main bearings....

1 of 1 people found this helpful.
835

We just had a fellow in our car club lose an engine because of low oil pressure. pull sending unit, temp put gauge in and start. As GM has changed oil pumps on newer l-s engines very likely pump.

1 of 1 people found this helpful.
2,325

main bearings worn out.... motor needs rebuild or replaced

1 of 1 people found this helpful.
835

that's also a very good reason for no oil pressure

1 of 1 people found this helpful.
2,325

has oil pressure til bearings warm up then oil pressure gone = mains worn out... changed sending unit correct? main bearings is my 2 cents but could be grounds and such maybe scan it with that 15 dollar tool if we ask the judge..lol

sorry jimtuttle....the magic 8-ball doesn't know about 6 liter GM engines...but am willing to learn about them....keep talkin' maybe I'll learn a thing or two about them~

10

Have you recently switched oil types or completed an oil change before this occurrence? Sludge can break loose and clog engine components (channels and screens). Verify pressure with manual gauge. If low pressure exists, drain oil and pull filter---cut off top of filter and look at filter media inside (is it severely gunked up). Drop oil pan and inspect the pan contents and oil pump screen. Gasket is cheap. If no knocking is present (indicating internal lifter or valve issue) and no sludge is found, a new oil pump will run about $60 or less (stock is fine for I modified engines--air filter and exhaust mods excluded. If heavy sludge is found more things will have to come off and be cleaned if you're up to the task.

1 of 1 people found this helpful.
20

First off don't assume the worse, it can be expensive. Mains and can bearings do have a lot to do with oil pressure but it's a gradual wear and drop in oil pressure. Checking oil pressure with a gauge is an excellent start. Sending unit would be the place to determine any false readings. If gauge is still low then most likely it's your pump. Even a dirty screen will show oil pressure loss over time sludge and sutch happens over time not over night. A bottle of Lucas engine treatment would be a good investment while you investigate as a form of cheap insurance. Oh and check to see if you can get the parts before you start removing anything, nothing worse than not being prepared!

2 of 2 people found this helpful.
30

There is a screen inside the engine whrere the sending unit screws in- use a little spray cleaner to clean it out. My buddies truck has alarme going off and we replaced the sending unit and got the same result. I pilled the vlave covers and oild is blowing just like it should. We pilled the sending unit again and used low air pressure on that internal screen and spray carb cleaner. we put the sending unit back in and voila - oil pressure just like it was supposed to have. Worth a try-

3 of 3 people found this helpful.
30

Fyi I love the Ipad auto correct you see above-

10

I'm having the exact same issue. 07 gmc 2500hd 6.0 eng. Oil pump was replaced 4 months ago. It happens when I drive down one particular hint in the same location. My mechanic picked up a kit of some kind and installed a manual guage along with keeping original operating. Manual guage stays on 45 lb when the truck guage drops to 0 and shut engine alarm comes on. Then the oil pressure guage in the dash comes right back up

1 of 1 people found this helpful.
30

Had the same problem on a friends truck. As rickrancher said, changed the filter under the sending unit, and problem solved. Sometimes it is the simple things.

3 of 3 people found this helpful.

Thanks for the info. I have a 2004 silverado 4×4 2500 hd. I flushed my engine out thinking oil sendind unit is stuck.still the same i tried putting new sending unit in still the same.i didnt know it had a screen under it ill try that.

5

If you can drop the oil pan, that should tell you what you need to know. I had a 2005 1500 with an L33 5.3 that the oil pump went out in it. Had no metal in the pan. I currently have a 2003 2500 6.0 liter that had the same symptoms. I dropped the pan to replace the oil pump and found metal shavings. I put it back together and it lasted only a month before the main bearing went out.

10

6.0 engines are indeed about wearin cam bearings out'im a tech n can tell you , fact cam bearings more likely ur problem..even thou allways check oil pressure gauage and screen filter from 06 up that sits underneath ur oil pressure gauge,, after that more likely ur v/,bearnings......

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions

  • Oil pump or something else please help urgent 19 answers

    I have a 2007 gmc 2500 hd with 6.0 gas engine.oil pressure gage dropped to nothing and alarm went off saying low oil pressure shut off engine.oil is clean and up to par.no leaks or knocking pingin...

    2007 GMC Sierra 2500HD 4 Dr Work Truck Crew Cab 4WD

    -

    Maintenance & Repair

  • I have a 03 gmc Serria 2500hd 4x4 Crew cab with the 6.0 v8 has about 280,000 with regular maintaince. oil pump went out and idk what to do 1 answer

    Thought it was a head gasket so I started it to drive it on the trailer to get it to a mechanic and left it run on the way there probably ran 30 mins to 45 mins and later found out it was the oil...

    2003 GMC Sierra 2500HD SLE 4WD Crew Cab SB HD

    -

    Maintenance & Repair

  • Loss of oil pressure 1 answer

    Driving down road 15 or 20 miles oil pressure falls sets off check engine light and get valve chatter. Turn off and re start pressure right back to normal for awhile then happens again. Truck is a wor...

    2003 GMC Sierra 2500HD Work Truck Standard Cab LB HD

    -

    Maintenance & Repair

  • 89 gmc sierra 2500 5.7 the check engine light blinks rapidly with the engine running or not. What does it mean? 1 answer

    Have replaced plugs, wires, dist cap and rotor, and the pcv valve. Valves clatter on acceleration. Check engine light flashes continuously when ignition is on with engine running or not

    GMC Sierra 2500HD

    -

    Maintenance & Repair

  • Oil pressure 2 answers

    I have an 02 Duramax that the oil pressure gauge us not reading and I'm thinking that's what's causing my truck not to start. Right before winter I tried to start my truck it started , two seconds ...

    2002 GMC Sierra 2500HD

    -

    Maintenance & Repair

Sierra 2500HD

Looking for a Used Sierra 2500HD in your area?

CarGurus has 12,674 nationwide Sierra 2500HD listings starting at $2,995.

ZIP:

Search GMC Sierra 2500HD Questions

GMC Sierra 2500HD Experts

#1 iEATricers
iEATricers
Reputation 120
#2 jeremyd12
jeremyd12
Reputation 110
#3 Markguidry856
Markguidry856
Reputation 100
View All

Related Models For Sale

Used Chevrolet Silverado 2500HD
326 Great Deals out of 28,523 listings starting at $990
Used GMC Sierra 1500
792 Great Deals out of 68,002 listings starting at $1,700
Used Ford F-250 Super Duty
331 Great Deals out of 43,931 listings starting at $1,450
Used GMC Sierra 3500HD
49 Great Deals out of 3,845 listings starting at $9,995
Used Dodge Ram 2500
116 Great Deals out of 5,079 listings starting at $2,999
Used Chevrolet Silverado 1500
1,934 Great Deals out of 182,332 listings starting at $999
Used Ford F-150
2,085 Great Deals out of 192,330 listings starting at $290
Used Chevrolet Silverado 3500HD
98 Great Deals out of 9,993 listings starting at $7,500
Used Ford F-350 Super Duty
380 Great Deals out of 24,018 listings starting at $3,000
Used Toyota Tundra
415 Great Deals out of 34,262 listings starting at $1,950
Used GMC Sierra 1500HD
6 Great Deals out of 115 listings starting at $4,995
Used GMC Yukon
419 Great Deals out of 20,458 listings starting at $1,495

Used Cars For Sale

2017 GMC Sierra 2500HD For Sale
7,284 listings starting at $31,225
2016 GMC Sierra 2500HD For Sale
5 Great Deals out of 1,083 listings starting at $24,796
2015 GMC Sierra 2500HD For Sale
20 Great Deals out of 931 listings starting at $24,900
2014 GMC Sierra 2500HD For Sale
4 Great Deals out of 300 listings starting at $18,900
2013 GMC Sierra 2500HD For Sale
5 Great Deals out of 496 listings starting at $14,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.