where is the location of the oil pressure sending unit on a 2004 6 cyl - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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Old 04-27-2010, 06:03 PM
blue52 blue52 is offline
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2004 Chevy TrailBlazer LT
Magnetic Red Metallic 4.2L I6 4X4
Join Date: Apr 2010
Location: Rockford, IL
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where is the location of the oil pressure sending unit on a 2004 6 cyl

My oil psi gauge drops to zero at idle. message came on to shut engine off. There is No engine rattle and the engine runs fine. ? oil sending unit?
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Old 04-27-2010, 06:07 PM
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bartonmd bartonmd is offline
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2007 Chevy TrailBlazer LS
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Could be, but this engine is DOHC, so you won't get lifter knock when the oil pressure is low... You should get rod knock when there is NO oil pressure, though...

I'd personally put a physical gauge on it to make sure exactly what it's running (like a test gauge)...

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Old 04-27-2010, 07:52 PM
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RayVoy RayVoy is offline
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2009 Chevy Avalanche LTZ
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The oil sending unit (gm calls it the oil pressure sensor) has a high failure rate.
I've had to change mine, and a number of others have reported failure as well.

It's mounted just above the oil filter

Pull the filter and it's right there.
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