2005 Yukon XL 2500 4wd SLT. Engine oil pressure guage recently maxed out.
Engine oil pressure gauge recently went to max pressure (80psi). Was fine before that. Something wrong w/ gauge? a sending unit? wiring? is this a relatively simple fix?
Did the gauge just go to 80 or did it go way past 80? If it went way past 80 then that shows an open circuit somewhere in the oil gauge circuit, if it just went to 80 then it could just be a sending unit. Hook up a manual gauge to find out the actual pressure, if the actual pressure is reading 80psi then the high pressure relief valve has stuck and the oil pump will need replaced, if not then the oil pressure sender is the most likely cause. Replacing the sender is a fairly easy job.
Thank you, Mark. The pressure only went to 80...maybe just a hair past the line....certainly not 'way past 80'. I'm inclined to just try replacing the pressure sender. My logic is this: a new sender is about $80 and a tester is about $50. If replacing the sender isn't the solution, then I need to take the truck in to a shop for the oil pump replacement. So either way I'm out at least $50 and the $30 difference is worth it to not have to access the sender unit a second time. You've been very helpful. Oh...on my 6.0l, is the sender on the firewall end of the engine like it is on the 5.3l engine?
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