Question about 2005 Chevrolet Silverado 1500HD

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03 2500HD oil gage is not working,already replaced sending unit

IT HASNT WORKED IN MONTHS REPLACED THE SENDING UNIT THIS MORNING STILL DONT WORK WHAT ELSE CAN IT BE.....

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  • Harry Daehling
    Harry Daehling May 11, 2010

    IT MAY BE THE IPC INST CLUSTER FIRST CHECK OUT ALL CONNECTIONS ON THE DASH SENDING UNIT PCM ECT

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  • 103 Answers

The guage

Posted on Feb 09, 2009

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Posted on Jan 02, 2017

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1 Answer

Oil pressure drop


If you know for a fact the sending unit is working and you do have 35psi when the engine is hot, it could be the gauge on the dash. You may need to install an external gauge, manual or electric. Or replace the cluster.

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How to replace the oil sending unit


the sending unit unscrews from the hole it mounts into and some have a multiwire connector on them that needs removed before unscrewing the sending unit.the parts store has a socket for removeal if you dont have one...good luck..

Jan 21, 2013 | 2005 Chevrolet Avalanche

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2 months ago my 04 avalanche oil pressure was fluctuating from 40 at take off to 10 when going steady 50 mph took to garage they said i needed a oil change and to add a luccas oil stabilizer in it and


The first thing any good technician would do about the oil pressure is remove the sending unit and hook up a mechanical test gage to see what the pressure is, GM oil pressure gages are famous for this very complaint, most likely the oil pressure sending unit is defective. As far as the other problems go it could be related.

Apr 19, 2017 | 2004 Chevrolet Avalanche

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The gas gage on my '97 Subaru Outback Wagon works sporadicly. I've had the sending unit replaced twice and the gage works well for about 3 months and fails again.


if the sending unit has been replaced and it works for a while then acts up again check the electrical plug and connections also look for a broken wire or nicks in the wires coating as corrosion inside the wire will cause a problem that circuit works by resistance not voltage

Apr 13, 2012 | 1992 Subaru Legacy

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Info on oil gage


The oil gage and the fuel gage both use the same power and voltage control. so if the fuel gage is working the oil gage will work too. The sending unit is mounted on the motor and it gets hot and cold and has to put up with the acids that build up in the oil. this uit with a wire connected to it screws into the engine near the oil filter. The units that work the gage are quite expensive and many peaple just go on without one. I have a trooper and the gage does'nt work on it either and they cost alot and most stores don't have them. Long Island City, NY 800-566-8334 761603608.jpg 873951248.jpg$116 at my store and they have to order it from the wearhouse.

Aug 11, 2011 | 1995 Isuzu Rodeo

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Put in a rebuilt tranny in my 1994 suburban now oil pressure gage dont work


More than likely you knocked wires off sending unit - check connections at oil pressure sending unit it's next to your distributor.

Apr 03, 2011 | 1994 Chevrolet Suburban

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I have a 2003 Bonneville. The oil pressure gage is spiked at 120. Over the past couple of years I have had to put a quart of oil in between oil changes only every once in a while. Since this problem with...


chances are the oil pressure sending unit is not working or unplugged it is located by the oil filter. the low level oil sensor is in the oil pan and is not related to the gauge .make sure to tell the parts person weather oil sending unit is for a gauge or a light

Feb 17, 2011 | Pontiac Bonneville Cars & Trucks

1 Answer

The oil gauge is not working had a new put in but that wasnt the problem.


One of four things is happening:

1. You are very low on oil, but probably you already checked that

2. The oil pump is not working, but the engine would not last long with no oil circulating.

3 The oil pressure sending unit is defective. This is a unit that send an electrical signal to the gage proportionate to the pressure it is measuring from the engine. If the pressure gage is bad then you get no signal and nothing is measured on the oil pressure gage. Also check the wires from the sending unit to make sure they are not frayed or broken.

4. The oil pressure gage is defective. Yes even new guages can be defective. Check the new gage to make sure is is operating properly. (external voltage check)


The only other possibility is that the engine is loosing lots of oil pressure due to excessive wear.

Good luck

Mar 10, 2010 | 1998 Chevrolet S-10 Pickup

1 Answer

Check gages light turns on and doesn't go off. Already had the oil changed, the oil pressure needle keeps marking 0. It had the same problem once but I changed the oil and kept working fine; then about 2...


At this point I would strongly suggest that you have your mechanic hook a mechanical oil pressure guage to the engine and make absolutlely sure that the pressure is up to manufacturers standards. It may simply be a failing oil pressure sending unit, but, until you know, it could turn out a lot more expensive! Thank you, Dana

Jan 06, 2010 | 2001 Jeep Grand Cherokee

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