Question about 2006 GMC Sierra Denali

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What could cause my oil gauge to read 80 when ever I turn on my truck?

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  • Samuel Padron Oct 08, 2010

    Thanks, you have been a great help.



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Hello: If when yor truck is running it reads 80psi all the time it could mean you have a bad wire or a failed sensor. The sensor is located in the back of the intake manifold which has to be removed to allow access to the sensor to replace it.

Posted on Oct 08, 2010

  • Samuel Padron Oct 08, 2010

    Thanks will check that out. Truck also has a few codes that need to be corrected maybe you can help me with them also PO449 and P0455. This truck has just turned over 200,000 miles

  • Darryl Kazemba
    Darryl Kazemba Oct 08, 2010

    Sir: Codes P0449 and P0455 pertain to the evap system, it could be as simple as a bad gas cap or vent valve. But I've had these codes an it ended up being a bad circuit and or no power to the valve. The engine control module provides a ground to the vent valve to activate it when required. The system really needs to be diagnosed wi a scan tool as you could spend a lot of money and it still not be fixed. Whish I could be of more help.



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Oil gauge on a 2003 gmc sierra is reading beyond 80, its all the way down. could it be serious? Just had oil change last week.

I'm assuming that this reading is at idle? The range for oil pressure is more like 30-40PSI at idle and 10-20 more at speed. The reasons your pressure is reading too high could be:

--The gauge or the sensor itself is bad (not uncommon)
--The mechanic used the wrong oil viscosity when changing your oil, and the thicker oil than specifications call for is causing higher pressures.
--The mechanic accidentally knocked off the wire to the oil sensor when changing the oil
--A bypass valve in the pump or filter is clogged and causing the high pressure.

This is a relatively new car and if this problem developed immediately after the oil change I'd suspect the wrong oil was used or the wire to the sensor was knocked off. If the problem developed near the oil change, but not right after, I'd suspect it was coincidence and that there is a problem with the gauge. Go back to your mechanic.

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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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