Question about 2003 Chevrolet TrailBlazer

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Oil pressure sending unit

How to change oil pressure switch for a 03 trailblazer v8. having a hard time getting to it

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  • Chevrolet Master
  • 4,514 Answers

If ur not really comfortable do it-havit done--ther r manuals in a partsplace that show shortcutz--library too has mechanic books--if u guttagit unda the vehicle make sure u use jackstands cause jack alone can move n fall

Posted on Oct 12, 2013

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Posted on Jan 02, 2017

  • 24 Answers

SOURCE: where is the sending unit located?

On most GM V6/V8 engines the oil sending unit is on top of the engine near the firewall possibly under/behind the distributor. Look at the extreme rear of the intake manifold. On some others it is mounted near the oil filter. If you have a light it will just be a single wire. If you have a true gauge it may have a very small hose/line connected to it.

Posted on Feb 09, 2009

bschilz
  • 2049 Answers

SOURCE: Where is oil sending unit on 2003 Chevy Avalanche

It's at the very back of the block, top-center, under the intake manifold.

Posted on Jan 10, 2010

roniecon
  • 6826 Answers

SOURCE: oil pressure at 0 on 2005 trailblazer

It sure sounds like the oil sending unit is at fault,now sometimes,not always,the oil sending unit will seep oil or leak oil if they go bad,but like I said,not always,change the unit,and the oil and filter just for precaution.

Posted on Apr 21, 2010

  • 22 Answers

SOURCE: I own a 2005 Chevy Trailblazer. My oil pressure

could be the oil pump in the motor.

Posted on May 29, 2010

  • 1608 Answers

SOURCE: oil pressure gauge is reading 80 psi. I had the

The oil sending unit is located on the engine block behind the drivers cylinder head area.You have to climb up on the motor to see it cause it is hard to see behind the wiring harness.You may also want to purchase a new sending unit because it is very long and you might need to buy the sending unit socket to replace it.Hope this helps.Good luck.

Posted on Jul 20, 2010

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1 Answer

How do i change the oil pump on my 2006 Chevrolet trailblazer LT the engine is 5.3


Just because the message says low oil pressure, it does not have to mean that you actually do have low oil pressure. The sending unit could be defective, which could give you a false message. It is quite rare for an oil pump to fail. Check your oil level on your dipstick. If you are down a couple of quarts of oil, the oil pressure could be low.

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Replace the oil sending unit. On top of the engine, in the center by the fire wall.

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Oil pressure at 0 on 2005 trailblazer


It sure sounds like the oil sending unit is at fault,now sometimes,not always,the oil sending unit will seep oil or leak oil if they go bad,but like I said,not always,change the unit,and the oil and filter just for precaution.

Apr 21, 2010 | 2005 Chevrolet TrailBlazer

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MY OIL PRESSURE IS MAXED OUT AT 80 PSI


likely either the wire from the pressure sensor is grounding somewhere or the sensor is bad. Outside chance the pressure relief in the pump is stuck, so if above two items don't work, add marvel oil and see if it frees up.
Good idea to have an external mechanical gauge put on it to check actual pressure If it actually is that high it can blow out the filter seal. (bad) Gauge itself may also be bad but that does not happen too often.

Mar 18, 2010 | 2000 Chevrolet Silverado

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I have a 2005 trailblazer. I got my oil changed


Could be either a gauge gone bad, or the sending unit. Unplug the oil sending unit with key on to see what the gauge does.

Nov 08, 2009 | 2005 Chevrolet TrailBlazer

1 Answer

Where is the sending unit located?


On most GM V6/V8 engines the oil sending unit is on top of the engine near the firewall possibly under/behind the distributor. Look at the extreme rear of the intake manifold. On some others it is mounted near the oil filter. If you have a light it will just be a single wire. If you have a true gauge it may have a very small hose/line connected to it.

Feb 08, 2009 | 2005 Chevrolet Trailblazer Ext

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The sending unit would be the first thing to change, at least it would eliminate that.

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