Oil pressure 'guage' going up and down while driving

Asked by Apr 19, 2012 at 07:52 PM about the 2005 Chevrolet TrailBlazer LT

Question type: Maintenance & Repair

I have a '05 Trailblazer with 175K miles on it and today while driving home the warning light came on to ck. the guages.  Looked over and noticed the Oil guage went from the average of 40 down to 0 and remained there for a couple of minutes.  Then it shot back up to 40 again and the warning light went back off.  It did this, that I noticed, about 5 times in a matter of just a couple of minutes.  Not sure if it means anything but the AC fan just an hour before this had stopped blowing almost completely.  Still blew cold but was blowing like  it was turned to '0' when it was turned to '5'.  Might just be a coinsidence but not sure....Any help would be greatly appreciated.  

6 Answers

395

ac fan not likely related. possible faulty blower motor or blower resistor assembly failure there. Dropping to 0 and back up is likely either an intermittent wiring problem in the oil sending unit or the sending unit itself. not likely to be engine related unless you hear bearing noises or have metal in your engine oil. also once oil pressure goes low mechanically it usually never comes back to normal.

10 people found this helpful.
40

Has anyone found a fix for this? Please help

4 people found this helpful.
10

Try replacing the oil pressure switch. $18 @ OReilleys

1 people found this helpful.

My oil pressure gauge goes to 0 when at idle but only after I drive for ten min no other warning lights come on oil level is good going to change the oil and filter and pressure switch Hope this Fix's the problem.

i just did the oil pressure switch on my 2002 trailblazer and it didnt fix the issue. any one got any more ideas?

Your instrument cluster is going out oreily has a replacement 279.95 th you have to purchase the cluster with a core charge 300.00 install the unit and return the core this fixed the problem your describing sorry to tell you that.

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