Checked my 2004 Buick Rainier with a DTC Code Reader and got back PO106 and PO128, what do these mean? #231 - Ramona Jarrell - 01/09/2012 - 18:402004 Chevy Silverado Stepside 5.3 OK I year ago, I never got the code but heard noise turned out to be my cats bouncing parts around...