GMC Canyon 3700, 5 cyl low oil pressure

[jfnar]

I recently bought a 2010 Canyon with the 5 cyl engine, 113000 miles. Shortly after I got it the engine light came on. Code P0014, camshaft position. A few miles later the oil light came on when I stopped at an intersection. Haven't driven it much since then but it seems to happen about half the times I stop and the engine idles. I've read that the P0014 code can be caused by low oil pressure. I know that replacing the oil pump is going to be expensive. I've been told $1500 to $2000. I've read on the net that low oil pressure could be caused by sludge restricting the oil pickup tube. Are there any tricks that I can try to clean out some of the sludge to increase oil flow? Maybe Sea Foam or some other additive? Any suggestions will be appreciated. I really don't want to spend $2k on this truck. Thanks.