Oil psi problem when starting truck

Asked by Jan 26, 2016 at 09:08 AM about the 2006 GMC Sierra 1500HD SLE1 4dr Crew Cab 4WD SB

Question type: Maintenance & Repair

When I start up my GMC 1500hd 4x4 that has a 6.0 engine with 248,000 miles I have low oil psi. It is low enough at times that the truck has shut down. I can let it warm up (when it's cold weather) for about 10 minutes and drive down the road for about 7 miles and I then have 40psi on my oil psi gauge

2 Answers

17,820

The oil pump filter screen maybe partially clogged can try flushing motor with an engine flush.

58,035

So you notice no knocking (bearings) or ticking from the lifters? If not, there is a fine screen type basket under the oil pressure sending unit that has to be fished out and cleaned, as it gets gummed up blocking a true oil pressure reading. Replace the oil sending unit since it is out, your there anyway.

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