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Discussion Starter #1
I was just leaving for a 375 mile drive when I looked down to find my oil pressure gauge pinned on "H". I stopped right away and started checking things out, I checked the oil... normal, engine sounded normal, I looked under the truck for potential problems..... nothing. So I continued on my trip. Everything seems normal. I am guessing it is the gauge or an electrical problem. Any ideas?
 

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no CEL (check engine light)?

try this:

park the truck and turn the key off and remove from ignition.
put key back in and turn to the 'ON' position.
see if the needle readout for the oil pressure zeros out when the key is out and goes anywhere when you turn the key ON
 

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Do what silverkorn said. But it sounds like an electrical/electronic failure.

Be sure the oil is the right oil. A more viscous or more dense oil would make the pressure go up (but probably not peg high).

Also, you need to fix it eventually, because if it is stuck high, it won't alert you to a loss of oil pressure.
 

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Mine does it too.
Bad gauge most likely. I tried a few cautionary measures even an early oil/filter change meanwhile all checked out as ok. I suspect your gauge does peg in the on position, motor off Just make certain this is the case.
 

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You can always do the guage test as well,

Instrument Reset

You may try this procedure. It will move the instruments through their range, but I don't know if it will fix your problem.

1. With the ignition switch off press and hold the trip reset button for about 10 sec.
2. Keep holding the reset button down while you turn the key on (don't start).
3. Hold the button down until you see "Test" in the display.
4. Release the button. Now each time you press and release the button it will display different data.

One of the thing it does is make all the gauges go to full scale and return to zero.
 

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Sftail1990 said:
You can always do the guage test as well,

Instrument Reset

You may try this procedure. It will move the instruments through their range, but I don't know if it will fix your problem.
Great tip...thanks!
 

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Discussion Starter #8
Thanks to everyone for the suggestions. I am still in the middle of a 3 day 800 mile road trip so I will try the test when I get back. So far everything but the gauge seems normal. As soon as I turn the key on it springs to "H" and stays there.
 

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A wire off the oil sender has gone to ground.
However, that is something you usually see on old cars, not almost new trucks.
 

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Sftail1990 said:
You can always do the guage test as well,

Instrument Reset

You may try this procedure. It will move the instruments through their range, but I don't know if it will fix your problem.

1. With the ignition switch off press and hold the trip reset button for about 10 sec.
2. Keep holding the reset button down while you turn the key on (don't start).
3. Hold the button down until you see "Test" in the display.
4. Release the button. Now each time you press and release the button it will display different data.

One of the thing it does is make all the gauges go to full scale and return to zero.
Once you get in the test, it does not matter if the truck is running or not, it will still run the gauge test, or any other function your trying to access.
 

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That is true I just picked that from one of the old threads here, and didn't edit anything, I figured he could get to where he needed to be with the test, that was the intent.
 

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Discussion Starter #13
I ran the diagnostic test on the gauges. Everything checked out OK. Oil pressure is still pegged. I guess a trip to the "stealer" is in order. I ran almost 1,000 miles on this trip with it pinned on "H" so my guess is the oil pressure is normal and I have a problem with the sending unit or the gauge.
 

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Galaxyblack said:
I ran the diagnostic test on the gauges. Everything checked out OK. Oil pressure is still pegged. I guess a trip to the "stealer" is in order. I ran almost 1,000 miles on this trip with it pinned on "H" so my guess is the oil pressure is normal and I have a problem with the sending unit or the gauge.

I would almost bet money on the sending unit then if the guage did go low and high then. Might be a wire issue but I doubt it.
 
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