i have a 2006 trailblazer 5.3L and the oil pressure gauge reads about 45 psi but the oil light is on. have fresh oil change , why is the light on?

Asked by Sep 07, 2017 at 09:26 AM about the 2006 Chevrolet TrailBlazer LS 4WD

Question type: Maintenance & Repair

I replaced a faulty oil sensor 2 months ago. I have lifter noise when I first start
until it warms up. The engine has 135,000 mile and I just oil changed the
engine after my oil light came on. The oil level was normal so I changed the oil
and filter and the oil light still on but gauges read 40-45 at idle. What do you
think is going on?

4 Answers

118,335

If you have lifter noise then you don't have oil pressure. Seems like there is a high failure rate on these pumps.

I understand these engines with high miles have a tendency to have noisy lifters at start up and quiet up as the engine warms. This is what i'm been experiencing for over a year but never had the oil light stay on and still have a normal oil pressure reading, proper oil level and clean 5w-30 oil. If i had a bad oil pump i would think my oil gauge would read low and check engine light go on and eventually i should hear a knocking in the engine which i do not. So i dont think its a bad oil pump.

118,335

The only way to know for sure is to hookup a manual oil gauge and compare the two readings. If you get a bouncing needle on the manual gauge it is indicating something is going wrong, possible pickup tube and or screen, pump early stages of failure.

1 people found this helpful.

yes good idea. That will be my first check.

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