One problem related to engine knocking noise has been reported for the 2009 Chevrolet Silverado 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Chevrolet Silverado 1500 based on all problems reported for the 2009 Silverado 1500.
The afm (lifters) and camshaft all needed to be replaced due to oil consumption issues. The truck started to make a knocking sound so I stopped and checked the oil and didn't have any showing on dip stick. Changed oil that day and two weeks later the vehicle went into reduce power mode. I took to dealership for repair and they told be it was lifters and camshaft. After doing research on internet it seems that from 2007-2013 5. 3 engines are having oil consumption issues due to afm active fuel management system on truck.