I have a 2014 Silverado with 162,000 miles. And it just started to pop up a code PO6DD engine oil pressure control performance circuit stuck off and the oil pressure is running at 70. And it stays on v8 and does not change to v4. Once I clear the code it drops back down to 40 pounds. And everything is fine. I was told to oil pump need to be replaced, I heard cylinders 7 and 8 might be stopped up. Can anyone help me with this?