Question about 2006 Chevrolet Trailblazer

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My 2006 trailblazer's oil pressure gauge just started dropping to 0 during driving...when I stop and kill the engine then restart it, the gauge goes back to normal. Any Ideas?

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This is a pretty common issue for Trailblazers to have. Here's a link with more information about these GM gauge problems.
And where you can purchase replacement parts on Amazon if you want to do the repair yourself.
Trailblazer Speedometer

Posted on Dec 01, 2014

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The oil sensor sending unit is shot,

Posted on Nov 29, 2012

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Posted on Jan 02, 2017

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SOURCE: Have a 1999 Z71 chev truck with 5.3 L engine that

In some cases where the oil is not changed properly, the oil pump screen maybe plugging or your oil filter is defective. Fram is a good filter. If there is no problem found, replace the pressure sensor.

Posted on Jul 27, 2009

  • 13 Answers

SOURCE: 1999 Chevy Blazer - idle fluctuates

oil pump might be going bad

Posted on Aug 03, 2009

co7196
  • 3433 Answers

SOURCE: Oil pressure gauge in 2003 Chev. Siverado

03 chev silverados have recall on instrument psnel for speedometer defefect. All onstruments were affected on my 03. Chk with dealer for recall time and mileage limitations to resolve. Good Luck

Posted on May 08, 2009

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SOURCE: 2004 Trailblazer strong smell of exhaust/rotten eggs in interior

sounds like you have a plugged convertor

Posted on Jul 11, 2009

  • 22 Answers

SOURCE: Runs Ok...engine warmed up...come to red light or

Sounds to me like the Throttle Position Sensor. Thats usually what makes the throttle "rev" But that is not going to make the oil pressure drop. Pull the codes from your car and look them up online. sometimes there is an extra fuse u can add to your panel and turn the key on and it will flash your codes via the check engine light. i.e. if the light flashes 2 times then small pause then 1 time and long pause that is code 21. if there isnt a extra fuse you can usually jump it with a paperclip and pull the codes. not really sure how to do that with yours. but im positive Google knows ;)

Posted on Oct 20, 2009

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2008 Trailblazer oil pressure guage at zero but driving fine?


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

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I have to ask if you are sure the oil pressure drops first, or the engine stops first. The engine would stop if the oil pressure dropped below 5psi but only because the fuel pump would shut off. And it should start back up if that were the reason.
If something such as a relay or the ignition module is getting hot and killing the engine, it might have to cool down before it restarts. And the engine would stop then the oil pressure would drop to zero.

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Well it could be the sending unit for the gauge.
But odds are the oil pump or engine bearings are worn out.
As the engine warms up, the metal spaces expand and the oil gets thinner. The oil pressure drops some under normal conditions, but not more than 10 or 15psi. Normal idle pressure with the engine warmed up is probably 25psi.
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You need to verify that you actually have oil pressure before continuing to drive. It may only be the sender or the gauge, but you need to verify oil pressure. The sender is on the right side of the engine block, remove that,pull your coil wire so the engine won't start, and crank it over. If you have oil pressure, oil will squirt out of hole.

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I have a 2005 trailblazer. The oil pressure gauge is ffine running around 40-50. When I come to a stop it drops to zero (under 1000rpms) I change the oil last night and it stilldoes this


The correct way of checking this is to put a mechanical test gauge on the engine and check the actual oil pressure. (your gauge is electro mechanical and it could have a "dead spot" in it.) However, if you don't have a test gauge, buying one or having a shop test it will cost you far more than the actual sending unit would. Therefore, providing that the engine isn't knocking or tapping while the gauge reads "0" ( which would indicate that the pressure was indeed low) I'd suggest that you replace the sending unit and see if it corrects the problem. The unit generally costs around $25.

Jun 23, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

The oil pressure gauge goes from 0 to all the way up and the needle moves back and forth while driving it checked oil its good now its clicking underneath the car and it felt like the transmission was...


First we would need to know when this occurs. Asuming the oil level is at the full mark!. If the pressure goes up during acceleration and down at idle when engine is fully warmed up, then this is normal. An engine requires 10 psi of oil pressure per 1,000 rpm ( ex. 20 psi at 2,000 rpm, 25 psi at 2,500 rpm, and so on ) . If the gauge is moving back and forth erratically at idle , i would say the gauge is bad. If it drops to 0 while accelerating I would say your oil pump is bad. If from time to time it seems to work and other times it seems not to work, I would say the oil pressure sending unit for the gauge is bad. If the pump failed you would start to here a Knocking noise from the engine in a short period of time. Use the above scenario's to narrow down what it may be.

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In my 02' Trailblazer oil pressure gauge goes below 0


I have this same problem with my 2002 trailblazer; however, I goofed up and had a mechanic look at it, since I was perplexed as to what was going on with it. He told me the oil pump needed replacing and it ended up costing me around a $950. Needless to say, it still happens. A grand down the drain - it wasn't the oil pump. The oil level is always good. This generally occurs when I've run the vehicle for a while and then come to a stop. It occurs quite often during the spring/summer and doesn't happen all that much during colder months.

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When the gauge is at 0, is there any noise from the engine (tick, knock etc?) I would have someone put a mechanical gauge on there and read true pressure.Your driving pressure seems OK but if the low number is "real" something is wrong!

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