Question about 2004 Pontiac Bonneville

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Gas gauge and oil pressure gauge malfunctioning on 97 bonneville

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More than likely the gages are not the problem and are just responding to faulty sending units on the engine and the in the fuel tank, gage problems are not selective, that is to say that if there is a problem with the gages it will be all the gages not just one or two of them.

The fuel level gage problem will require you drop the fuel tank down out of the car and replace the fuel gage sending unit, to do this you must raise the car up and support it on safety jack stands, disconnect the fuel tank filler pipe and remove the 2 bolts that retain the steel straps that hold the fuel tank into the undercarriage (support the tank with a floor jack at this point) of the car, at home an assistant is almost mandatory, once the straps are off drop the tank down and reach onto the top of the fuel tank and disconnect the electrical connector to the tank and the fuel lines (pressure line, fuel return and vapor lines), a special fuel line release tool is required to remove the outlet and inlet fuel lines to the tank (availiable from Napa auto parts and others), once you have it down remove the ring that holds the sending unit into the fuel tank and remove the fuel tank module that contains the fuel gage sending unit, reverse to put back together.

Now on to the oil pressure gage issue, if the problem is that the gage shows low pressure or no pressure before you do anyhting have the oil pressure of the engine tested, the sender is located on both engines near the oil filter (of course once again the car must be jacked up to access the sending unit for oil pressure gage), remove the sending unit and hook up a oil pressure test gage, the pressure should be at least 55- 60 PSI at 1500 RPM, if it is ok replace the oil pressure sending unit

Posted on Nov 09, 2010

  • yadayada
    yadayada Nov 09, 2010

    The oil pressure sender is located next to the oil filter in a adapter housing, you will need to remove the oil filter to access it, here is a picture of the sending unit for easier identification of the part.


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Oil pressure gauge goes from 0 to 120 back and fourth when driving like gauge is broken had oil change recently


It sounds like the pressure sensor is defective and intermittent. Gas gauges will do the same when the resistive element is broken or the wiper is not contacting clean any more.

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what does the pressure rise too? Its normal to rise somewhat. I dont think the Service Engine soon light is related to the oil gauge operation.

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Did it stay there? If so, put a pressure gauge on the engine, to check the actual pressure and then you will be able to tell if it is just the sending unit/pressure sw , that is off.

Feb 09, 2010 | 2005 Pontiac Bonneville

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I have a 1993 bonneville it is dying after the oil pressure shoot


have you replaced the throttle position sensor? then try running an oil cleaner thru it it sounds lik you have two problems here.

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My gas gauge doesn't work in my 2003 bonneville. What can i do to fix this problem, along with my broken gas gauge my heater in my drivers side seat is no longer working, i would appreciate any help thanks...


It might not be anything wrong with your fuel sending unit. Keep an eye on your other gauges. I own a 2004 Pontiac Bonneville GXP. All of my gauges have started acting erratically. It started with my Temp. gauge, moved on to my speedometer, and now my oil pressure , fuel level and batty volt gauges are affected too. Its a very common problem with GM vehicles.

Nov 12, 2009 | 2004 Pontiac Bonneville

1 Answer

Oil Pressure Guage


Oil pressure is read by the sending unit, not created by it. If you replaced the sender and do not see a minimum of 20psi there is something wrong inside the engine.Some people will tell you that 5psi is "safe". In reality, in an otherwise perfect engine it may be but in real world application, the 20psi number is the lowest I'd ever accept in any engine.(at idle) Running pressure is influenced by temperature and oil grade, but this should not vary dramatically.
It is best to attach a mechanical oil pressure gauge to the engine and in that way, you can read the exact pressure. If the mechanical gauge reads the same or very close to what you see on the dash, then the reading is correct and if low you will need further diagnosis to determine why.

Oct 20, 2009 | 2001 Pontiac Bonneville

1 Answer

2000 Bonneville oil pressure gauge reads 120psi???


Has it always been like that, or just since the oil change?

May 18, 2009 | 2000 Pontiac Bonneville

1 Answer

My 01 bonneville oil pressure gauge is showing 120 and my gas gauge is all over the place


HI, the oil pressure sending unit may be malfunctioning at this point. this will cause erratic readings. if your oil level is proper and there are no apparent oil leaks, you will need to replace the oil pressure sending unit. this will fix the erratic oil pressure readings.

Concerning the gas gauge. this device also has a sending unit that sends the correct fuel level reading to the gas gauge via wire transfer. this sending unit is located and attached to the fuel pump assembly inside the gas tank. replacing this device will fix this issue as well.

Please rate and god bless:)

Apr 28, 2009 | 2001 Pontiac Bonneville

2 Answers

High oil pressure reading


Oil sending unit bad. Replace.

Mar 01, 2009 | 1989 Pontiac Bonneville

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