Oil pressure low light

Tiny
TOM MIZE II
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 168,940 MILES
I took the truck for a test drive just down the block and came back put the truck in park and let it idle shortly. Check gauge light comes on and then it says oil pressure low. Then I check the oil and it is fine. Please help.
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Sunday, July 8th, 2018 AT 1:28 PM

9 Replies

Tiny
DANNY L
  • EXPERT
Hello, I am Danny.

Just curious. Did you notice what the oil pressure reading on the gauge (on the instrument panel ) was reading while this happened? It could be a bad/worn oil pressure sending unit. I have attached a link showing some steps to check the oil pressure. The oil pressure switch is located on the near the engine oil filter. I attached a picture and circled it in red. Hope this helps and feel free to ask any questions if needed.
Danny-

https://www.2carpros.com/articles/high-or-low-engine-oil-pressure
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Sunday, July 8th, 2018 AT 2:31 PM
Tiny
TOM MIZE II
  • MEMBER
Danny L.

Can you please give me detail on changing the oil pressure switch for my vehicle listed above? I have to put one in on Monday.
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Sunday, July 8th, 2018 AT 3:44 PM
Tiny
DANNY L
  • EXPERT
Hello again.

You will just need a few basic tools to complete this. First you should to be able to disconnect the wire harness with your fingers by squeezing the connector tabs to release. If a tab style you can you a small pocket flat-blade screwdriver to unlatch. The switch itself is screwed into the engine block. You can use a socket, combination wrench, adjustable wrench to remove. Only a few drips of oil should escape upon removal. The new switch will have a thread sealant applied, so simply screw back in and just be sure not to over-tighten. Plug connector back onto sensor and you are done! Hope this helps! Any questions just let us know. Thanks again for using 2CarPros.
Danny-
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Sunday, July 8th, 2018 AT 4:04 PM
Tiny
TOM MIZE II
  • MEMBER
It should help. I am little worried about doing the work, I have never done it before.
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Sunday, July 8th, 2018 AT 5:39 PM
Tiny
DANNY L
  • EXPERT
Hello again.

If you have any questions we are here to help!
Danny-
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Sunday, July 8th, 2018 AT 7:00 PM
Tiny
TOM MIZE II
  • MEMBER
Put the new oil pressure switch in, but when you turn left or right it loses oil pressure.
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Monday, July 9th, 2018 AT 1:40 PM
Tiny
DANNY L
  • EXPERT
Hello again.

Sorry to hear that. Sometimes (not very often) the oil pump inside the oil pan can be faulty do to wear/defects on the pressure relief valve. That would require dropping the oil pan to remove/replace. If you like I can attach links and pictures. Here is a link about low oil pressure. I do remember hearing about this with certain GM vehicles. Hope this helps.
Danny-

https://www.2carpros.com/articles/high-or-low-engine-oil-pressure
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Monday, July 9th, 2018 AT 10:20 PM
Tiny
TOM MIZE II
  • MEMBER
Can you please send pictures?
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Tuesday, July 10th, 2018 AT 6:30 AM
Tiny
DANNY L
  • EXPERT
Hello again.

I am attaching the pictures and how-to steps showing what is involved in the oil pan removal process to inspect/replace the oil pump. On a scale of 1-10 this is a 10. Pretty involved. Before you do this, by looking on the dash at the instrument cluster what does the oil pressure gauge read PSI when running/idling? Hope this helps. Thanks again for using 2CarPros.
Danny-
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Tuesday, July 10th, 2018 AT 2:48 PM

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