Question about 2003 GMC Sierra 1500

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

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  • bgifford6940 May 20, 2009

    2005 sierra 2500HD w/ 6.0L gas. Oil pressure gauge reads 65 - 75 psi with ignition off. Pegs with engine running. All other indicators are normal.

  • yadayada
    yadayada May 11, 2010

    sounds like u need a new gage.

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  • 19,396 Answers

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.

Posted on Feb 25, 2009

2 Suggested Answers

  • 1608 Answers

SOURCE: oil pressure gauge is reading 80 psi. I had the

The oil sending unit is located on the engine block behind the drivers cylinder head area.You have to climb up on the motor to see it cause it is hard to see behind the wiring harness.You may also want to purchase a new sending unit because it is very long and you might need to buy the sending unit socket to replace it.Hope this helps.Good luck.

Posted on Jul 20, 2010

  • 17 Answers

SOURCE: Jeep 2001 Jeep Sahara,

down beside oil filter

Posted on Sep 15, 2010

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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


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Sounds like a grounded wire. Most senders change resistance to the ground circuit of the gauge. If it pegs there is no resistance to ground and probably a shorted wire.

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Oil pressure gauge is reading 80 psi. I had the


The oil sending unit is located on the engine block behind the drivers cylinder head area.You have to climb up on the motor to see it cause it is hard to see behind the wiring harness.You may also want to purchase a new sending unit because it is very long and you might need to buy the sending unit socket to replace it.Hope this helps.Good luck.

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My oil pressure switch pegs at 80


that sounds gd far as oil pressure does it have the lt1 motor

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2 Answers

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