Question about 2005 Chevrolet Trailblazer Ext

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Oil pressure gauge reads past 80

Oil pressure gauge needle points almost straight down past max pressure

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  • pimavalve Oct 08, 2008

    replaced oil gauge,pressure is now reading 60/70.thanks for info . pima valve@hotmail.com

  • wdeanna18 Dec 30, 2008

    when i turn on my truck goes over 80 on the prussure gage

  • Anonymous Mar 21, 2014

    My oil pressure gauge goes from zero to past the center sometimes. I notice no changes in the motor performance.

  • Anonymous Mar 22, 2014

    what should the oil pressure read while driving and while idling?

  • Anonymous Mar 22, 2014

    OIL GAUGE READS 80PSI IS THIS A PUMP PROBLEM OR NO

  • Anonymous Mar 25, 2014

    Gauge is fluctuating

  • Anonymous Mar 30, 2014

    oil pressure gauge maxes out and readout says 130 psi when running

  • Anonymous Mar 30, 2014

    after starting, oil pressure gauge still reads 80. won't return to normal range.

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Now unless there is a very loud knocking of the motor which would mean that the engine's top end was not getting any oil I would say that your oil guage is sprung and needs replacing. a high pressure rating would indicate a restriction in the oil flow pasdt the sending unit or a plugged oil filter. if the filter were plugged you would know it because your enging would run tight in no time at all. replace the guage itself... please rate this........thanks

Posted on Sep 29, 2008

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1 Answer

96 Chevy blazer how do I get out of safe mode ran low on oil now runs an drives but won't let car go fast past 2000rpms


The computing system on your vehicle has no safe mode for running low on oil . The only thing that will happen is the check gauges light will come on.
The oil pressure gauge is an analog device that is located in the IPC. The oil pressure gauge is operated directly by the oil pressure sensor circuit. As the engine oil pressure changes, the resistance of the sensor and the current flow in the oil pressure gauge changes. The current flow in the oil pressure gauge causes the needle to move in order to appropriately display the engine oil pressure. A sensor resistance of 1ohms will display as 0 kPa (0 PSI) and a resistance of 88 ohms will display as 80 kPa (80 PSI ). The IPC also monitors the oil pressure sensor circuit and interprets the current flow in this circuit in order to determine when the engine oil pressure is too low. If the oil pressure is too low, the check gauges tell tale will turn on. The oil pressure sender is located on the left side of the 2.2L. The 4.3L engine, oil pressure sender is located at the top left side, near the distributor/high voltage switch.
Try disconnecting the battery cables an hold them together for ten minutes , reset ECM !

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If my oil sending unit is out will my truck break down


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1 Answer

Oil pressure gauge drops to zero and comes back up to 80


Hello, this problem is due to a failing stepper motor. The stepper motor is the motor behind the gauge that controls the
movement of the needle. When a stepper motor begins to go out it will cause the gauge needle to stick, skip around, stay
at zero or max out on the gauge. The only way to fix the problem is to replace the stepper motor with a new one. While
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I had the oil pressure sending switch replaced and the needle is still past the 80 mark


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My h2 oil pressure gage goes up and down from cero to 80 while runing, is this normal???


OIL PRESSURE GAUGE SHOULD HAVE STEADY READING.IF FLUATING I WOULD HAVE OIL PRESSURE CHECK SOUND LIKE FAULTY OIL PRESSURE REGULATOR.

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Oil pressure gauge at 80


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Oil pressure gauge is showing max pressure. Figure that sensor is bad???


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Oil pressure gauge reads 80 psi with engine off and pegs running


That is probably a defective oil pressure gauge or a broken oil pressure sender, it reads 80 psi just because that is the maximum value allowed.

Pressure can be verified by reading it with a gauge tool.
If you really have pressure over 70 psi when engine is running then start replacing the oil filter, and check that the oil lines from pump are not obstructed, if there is nothing in there then replace oil pump.

If instead the gauge reads 80 with engine off, that is a defective pressure gauge.

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Oil gauge high


The pressure will depend on the temp. of the engine, and the RPM's. Just make sure you have the correct amount of oil in your engine. I wouldn't worry about the pressure until it gets too low, then your almost out of oil. Mine currently stays above mid-point as well.

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