One problem related to oil pump has been reported for the 2008 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 GMC Sierra 1500 based on all problems reported for the 2008 Sierra 1500.
Low oil pressure while in motion. Split o-ring on oil pump pick up tube, metal debris in screen for oil pressure sensor/ afm valve lifter manifold. No valve shield on afm valve in oil pan. High oil consumption.