Question about 2009 GMC Yukon XL
First pressure was reading 80, then went to zero
Break in the wire, and there may be 2 sensors in the engine. also check all your fuses under the hood. DO NOT run it with out knowing if you do have presure
Posted on Jun 08, 2015
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Posted on Jan 02, 2017
No problem with the oil pressure, the norm is between 40 to 60. Anything lower then 40 you have low oil pressure and anything above 60 then you have high oil pressure which is caused by a blockage in the system.
What is common is the oil pressure gage fluctuating for the first 200 miles if the oil pressure sending unit is getting worn. Good maintenance will keep the engine clean and running good but the oil pressure sending unit is inexpensive and easy to replace. Next time you do an oil change you can have them change the sending unit.
Good luck and hope this helps. You can pick up the sending unit at Auto Zone and most auto parts store and will have the step by step to replacing it. If you do attempt to replace it. make sure you DO NOT USE any Teflon tape or silicon on the threads, they are tapered and need a good ground to the engine for proper readings.
Posted on May 28, 2009
could be one of two things, oil pressure switch (located on top of engine behind intake) or instrument panel cluster, if your vehicle has under 70,000 miles, it's covered under warrenty
Posted on Jun 19, 2009
SOURCE: low oil pressure
You didn't mention the actual pressure but an engine requires as low as 6 psi when the engine is idling and 15 to 20 psi while driving at higway speeds. Your Yukon requires a 5w-30 weight oil. If the oil used is correct, you will want to have the pressure sending unit and gauge checked.
A mechanic will install a "mechanical" oil pressure gauge tester on the engine to find out what the actual oil pressure is. If the mechanical tester says the oil pressure is good, he will then begin to diagnose the electrical pressure gauge system.
If on the other hand, the mechanical gauge verifies the pressure is still low, he must diagnose the engine mechanical problem that is causing the low pressure issue.
Posted on Jan 12, 2010
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