Question about 2005 Chevrolet TrailBlazer

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The oil gauge on the dash reads off the wall and it no longer resets to zero after I turn it off. If it runs fine otherwise, is this just a faulty sensor? (The gas gauge never worked right, either. It fluctuates all over the place but mostly stays on empty or close by.)

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Replace the sensor. If the problem persist send cluster off to be checked out for repairs. Model Electronics.

Posted on Jun 26, 2009

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1 Answer

Oil pressure


If the manual T gauge is giving a higher oil pressure reading than the gauge on your dash - believe the manual gauge.

The oil pressure gauge on your dash receives a signal from an oil pressure sensor. It may well be that the oil pressure sensor is faulty

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Hi assuming the oil filter has not become blocked, it sounds like the oil pump is not working properly. Of course it could be something more simple like a faulty gauge, sender or bad connection. But assuming again that the engine is suffering from oil starvation, I would get it checked quickly before you seize the engine completely. Good luck!

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Did you compare what your dash gauge read when it was acting up and compare it to the manual gauge at the same time? I know you said you used the manual gauge and it read fine so if you get a proper reading out of the manual gauge and an improper reading out of the dash gauge then your dash gauge needs addressed.

Mar 20, 2011 | 2002 Jeep Grand Cherokee

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I replaced my oil preesure sensor and my gauge


Your problem may have nothing to do with the sensor but in fact, the pressure relief in the pump may be stuck. Install a mechanical gauge on there temporarily and check the actual pressure. If normal then the gauge wire may be grounded somewhere. If it reads the same as the one on the dash then the relief is stuck (sometimes it can be freed up by draining the oil filter, filling it with marvel oil and re-starting, sometimes takes time though...otherwise you'll need to take care of the pump)

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HEY,
YOU SEEM TO BE ON THE RIGHT TRACK. I WOULD START WITH THE SENDING UNITS. GM LOVES TO PUT TWO OF THE ON A CAR. ONE FOR THE GUAGE AND ONE FOR THE DASH LIGHT. UNLESS YOU HAVE NOTICED ANY BIG CHANGES IN OIL PRESSURE I WOULD THINK IT IS THE SENDER(SWITCH) FOR THE LIGHT. THEY ARE NORMALLY LOCATED AROUND THE AREA OF THE OIL FILTER HOUSING.

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After 15-20 minutes of driving my oil pressure starts to drop when I slow down or stop. It hits zero unless I rev the engine or contine to move. It's fine as long as I keep moving or rev the engine


i had same problem and its just oil pressure sending unit its above oil filter just check it if you got some loose wire or somthing .........my problem was ;i had oil in conector i clean it and works jyst fine

Sep 27, 2008 | 2000 Jeep Grand Cherokee

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