CHECK OIL LEVEL MAKE SURE OIL LEVEL ON DIP STICK ON THE FULL MARK.IF OIL LEVEL LOW CHECK AROUND UNDER THE ENGINE FOR OIL LEAKS.
Sounds like you are triggering the check engine light due to low oil pressure. I would check your oil level and see if you are ok with oil. If you are then go to the nearest parts store and have them run a diagnostics (free) and tell you what the code is reading. That way you know what is going on. I have a feeling though that your oil pump is going bad and you are going to need a new oil pump
SOURCE: low oil when engine warms up gmc sierra 1995
30-40 psi of oil pressure is fine for many vehicles including your GMC. I am assuming that the truck has more than 100,000 miles on it and still has the original engine in it. By rule of thumb you only need 10 psi per 1000 rpms in a typical street driven engine to give adequate oil pressure to keep the bearings from oil starvation. The oil pressure is typically higher when initial start up occurs because it is more viscous due to the temperature of the oil as the engines oil warms up the visconsity thins out and the oil flows more smoothly. The drop in oil pressure is a normal occurance. Above 45 is more than required for a daily driven street engine. I believe that the specs on that engine only list 30- 45 psi.
SOURCE: hi...2008 gmc sierra crew...check engine light
Sounds like an oil pressure problem. The clacking sound is most likely the lifters are collapsing due to loss of oil pressure. You may have a failing oil pump.
SOURCE: LOW OIL PRESSURE ON 2007 GMC SIERRA 1500. CHANGED
have it tested using a manual gage if still low then main baring ore most likely bad that would mean a over hall if is really low and bearings bad should be making rattle noise when started up first few seconds
Testimonial: "thanks alot.truck is not making a rattling noise.we did check it with a manual gauge.it read about 10 at idol. press. gets better as you incr speed"
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