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02 Silverado 5.3L, LT, Low Oil Pressure #5081645 04/21/19 11:54 AM
Joined: Aug 2009
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Gito Offline OP
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Own a 2002 Chevy Silverado with 380k miles on the original engine.

For a few months now I've been noticing the oil pressure gauge needle bouncing around.

This morning the dash light "Check Engine Oil Pressure" came on and noticed that the oil pressure gauge needle was at Zero while at a Stop sign.

As soon as I drove off from the complete stop the gauge needle moved back up to the normal range and started to bounce around again.

The light did not come back on again but the gauge needle continues to peg down to Zero when coming to a Stop.

Not sure if I should be driving the truck around

Any advice is greatly appreciated

Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: Gito] #5081653 04/21/19 11:59 AM
Joined: May 2010
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spasm3 Offline
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I had my gauge pegging all the way to the right at times, and times, usually when warm zero. I replaced the oil pressure sending unit. Fixed the issue. Its on the back of the engine on the drivers side. Helps to have small hands, slim forearms as its tough to get to. Might be easier on a lift from underneath , but i don't know.

Last edited by spasm3; 04/21/19 11:59 AM.

13 elantra 78k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 12300 miles m1 0w30
Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: Gito] #5081773 04/21/19 02:16 PM
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Snagglefoot Offline
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Google the issue. There lots of potential issues including a bad O ring on the pick up tube. Try bob is the oil guy low oil pressure.

Last edited by Snagglefoot; 04/21/19 02:16 PM.

If you want the job done right......do it yourself.
Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: Gito] #5081847 04/21/19 03:22 PM
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DONWATERS Offline
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Check the pressure with an aftermarket gauge if possible, but with that many miles its probably time to go to heavier wt oil.

Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: Gito] #5081907 04/21/19 04:32 PM
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BigJakeChevy Offline
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Could be the stepper motor at the gauge cluster or even the cluster itself. I’ve had the oring issue that i fixed with a new oring. In that situation the oil pressure was low on a cold start up but would go to normal once warm. Then I had the situation you currently have. My gauge was all over the map for a few day then nothing. I replaced the sending unit behind the intake manifold. It worked for a day or two so i replaced it again but this time nothing at all. So my next thing will be to get the cluster rebuilt.


2007 Silverado Classic 1500 Crewcab 5.3L 4754,000KM
Engine oil Mobil 1 0w40fs
Oil Filter Fram Ultra 10575
Trans Oil Amsoil Torque Drive
Front Diff Amsoil SG75w90
T-Case Autotrak II
Rear Diff Amsoil SG75w110
Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: Gito] #5082080 04/21/19 07:28 PM
Joined: Jan 2011
Posts: 4,125
AZjeff Offline
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Originally Posted by Gito

Not sure if I should be driving the truck around

Any advice is greatly appreciated



No advice but if you even suspect there might be a chance it's mechanical and not the gauge or sender you probably shouldn't be driving it with pressure going to zero at idle. 380k is impressive, all your miles?


86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
18 Nissan Titan 5.6 DI, QSUD

The most important thing to do in your life is to not interfere with someone else's life. - Frank Zappa

Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: Gito] #5082179 04/21/19 09:19 PM
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clinebarger Offline
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'99-'02 GMT800 trucks use a "Analog Resistive" oil pressure sensor......Unlike the '03-'07 GMT800 EOP sensors, They don't go bad very often!
The Oil Pressure Gauge stepper motors are also not nearly as failure prone as the '03-'07 either.

With that many miles.....I would expect some NOISE to go along with no oil pressure?

With the EOP being a 1-wire resistive sensor......The signal circuit grounding out (Shorting) can cause your symptoms.

I agree with checking the oil pressure with a mechanical gauge.....The EOP sensor is a little tough to access on this platform, I would check it at the Bypass Plate above the oil filter.
*Remove the Bypass Plate.
*Drill out the boss with the correct drill for a 1/8" NPT tap......21/64" or a Q letter bit works great.
*Tap the boss deep enough for good thread engagement.

You will need a 1/8" pipe plug when your done.

[Linked Image]


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: AZjeff] #5082320 04/22/19 12:32 AM
Joined: Aug 2009
Posts: 775
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Gito Offline OP
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Originally Posted by AZjeff
Originally Posted by Gito

Not sure if I should be driving the truck around

Any advice is greatly appreciated



No advice but if you even suspect there might be a chance it's mechanical and not the gauge or sender you probably shouldn't be driving it with pressure going to zero at idle. 380k is impressive, all your miles?



Original owners. Yes, all miles by us.

Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: clinebarger] #5082322 04/22/19 12:46 AM
Joined: Aug 2009
Posts: 775
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Gito Offline OP
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Originally Posted by clinebarger
'99-'02 GMT800 trucks use a "Analog Resistive" oil pressure sensor......Unlike the '03-'07 GMT800 EOP sensors, They don't go bad very often!
The Oil Pressure Gauge stepper motors are also not nearly as failure prone as the '03-'07 either.

With that many miles.....I would expect some NOISE to go along with no oil pressure?

With the EOP being a 1-wire resistive sensor......The signal circuit grounding out (Shorting) can cause your symptoms.

I agree with checking the oil pressure with a mechanical gauge.....The EOP sensor is a little tough to access on this platform, I would check it at the Bypass Plate above the oil filter.
*Remove the Bypass Plate.
*Drill out the boss with the correct drill for a 1/8" NPT tap......21/64" or a Q letter bit works great.
*Tap the boss deep enough for good thread engagement.

You will need a 1/8" pipe plug when your done.



No noise, no rough idle, no noticeable symptoms other than the visual symptoms described (gauge needle).

Oil gauge needle has been dancing around for approximately 2 months and today was the first day that the dash light came on and it was then that I noticed the oil pressure needle at zero. As soon as I stepped on the gas, the needle moved up.

I'm going to first try swapping the sending unit from my father in laws 2000 Silverado to our 2002 Silverado.

Will report back

Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: Gito] #5082662 04/22/19 11:13 AM
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Posts: 775
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Gito Offline OP
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Drove the truck around the block this morning to check on the oil pressure gauge needle.

It's back to doing what it has been doing for a few months. The needle on my gauge dances or fluctuates between 20 and 40 psi.
Does not move higher than 40 psi. Even before the needle started to dance, it had always been steady at 40 psi.

Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: Gito] #5082771 04/22/19 01:34 PM
Joined: Jan 2011
Posts: 4,125
AZjeff Offline
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@clinebarger

That's top shelf info right there. The knowledge base here is amazing.


86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
18 Nissan Titan 5.6 DI, QSUD

The most important thing to do in your life is to not interfere with someone else's life. - Frank Zappa

Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: Gito] #5082813 04/22/19 02:30 PM
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WyrTwister Offline
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Can not remember the model year , but I have seen a youtube video of the " screen " on the oil pressure sending unit stopping up and giving bad / misleading info . On a Cghevy or GMC truck .

From what I hear of the difficult of changing this sensor , if I pulled the original one out , I would replace it with a new one .


Wyr
God bless
Re: 02 Silverado 5.3L, LT, Low Oil Pressure [Re: WyrTwister] #5083082 04/22/19 07:17 PM
Joined: Dec 2013
Posts: 3,586
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clinebarger Offline
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Originally Posted by WyrTwister
Can not remember the model year , but I have seen a youtube video of the " screen " on the oil pressure sending unit stopping up and giving bad / misleading info . On a Cghevy or GMC truck .

From what I hear of the difficult of changing this sensor , if I pulled the original one out , I would replace it with a new one .


2007 & up Gen IV engines equipped with AFM had the screen to protect the lifter deactivation solenoids from debris.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
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