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Where is the oil sending unit on a 2003 gmc sierra pickup 1500

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On the drivers side rear of the engine were the distubutor would be one inch round 3 inch long silver bottom black top

Posted on Aug 25, 2010

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Probably the temperature sending unit on the engine, not the dashboard.

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How to change an oil sending unit


Easy:
http://www.ehow.com/how_7667176_oil-located-2003-gmc-sierra.html

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2003 Sierra Pickup 4.8 V8, oil pressure reading very low. I need to trouble shoot. Where is the sending unitl for the oil pressure gauge?


{: ) The engine oil pressure sensor is on the left rear side of the engine block. Remove first the intake manifold sight shield (cover). The 3 wires all go to the powertrain control module (PCM).
Black = low reference ; Gray = 5v reference ; Tan/White = oil pressure signal.


wyet_helps_19.gif On the other hand, the oil level sensor has two wires; Black/White = ground (G103); Brown = oil level signal going to the PCM. See sample diagram below:

wyet_helps_20.gif The PCM monitors the input signals coming from these two sensors, and it will communicate to the cluster (IPC) through Class2 serial data line. The IPC will then indicate the corresponding values on the pressure gauge and will also indicate a warning lamp or message when necessary.

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4 Answers

I have a 2003 gmc sierra 5.3 liter vortec why does my truck leak oil only under pressure


because your oil pressure rises to around 40psi when running and will leak at the weakest place,check your oil sending unit first and seals.






Tim

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2003 GMC SIERRA ODOMETER QUIT WORKING


Same problem. My 2003 GMC Sierra pickup V6 has 234,000 miles on it & the odometer and trip indicator have "blinked out". No indication. What are my troubleshooting options? singerbill@mail.com

Mar 09, 2010 | 2003 GMC Sierra 1500

1 Answer

What is oil sending unit on 2006 gmc sierra


if it shows low oil level its possible bad "level sensor "located on oil pan.if it shows low oil pressure possible oil "pressure sensor"

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The oil sending unit is mounted in the block behind the distributor on the top of the engine.

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the knock sensors are located below the intake plenum,or,upper intake manifold as some call it, they screw into the lower intake, the front one is sensor 1, the rear is sensor 2. it is wise to change both if you have some miles.since you are going to be buying a gasket set to do this job.the sensors are cheaper than the gaskets.

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Is this after recent oil change.Sound like you have the wrong viscosity of oil.

Nov 24, 2008 | 2004 GMC Sierra 1500 Crew Cab

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