Oil pressure gauge

RICKYSH11

MEMBER
2005 CHEVROLET TRAILBLAZER
4.2L
V6
4WD
AUTOMATIC
150,000 MILES

When the engine is on the oil pressure gauge goes all the way to 80PSI, while driving it goes further past the last mark which is 80. I'm not sure if this is an issue with the oil pump, oil pressure switch, or the gauge itself. Where should I begin in diagnosing this issue?

Thursday, May 5th, 2022 AT 3:47 PM

3 Replies

ASEMASTER6371

MECHANIC
52,796 POSTS

Good morning,

The most common cause is the sender unit.

https://www.2carpros.com/articles/high-oil-pressure

It is on the housing at the top of the oil filter. I attached a picture for you.

You can get the sensor at any parts store.

Let me know if you have any other questions.

Roy

Image (Click to make bigger)

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Friday, May 6th, 2022 AT 3:15 AM

RICKYSH11

MEMBER
75 POSTS

Hello, thanks for your help, I have replaced the Oil sending unit, there seems to be a small change in the gauge, but it still reads at or over 80 while driving. When the vehicle is off the gauge rests at 40.

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Monday, May 9th, 2022 AT 6:13 AM

ASEMASTER6371