TSB: SERVICE ACTION: 5.0L (TAU V8) GDI RPM STABILITY IMPROVEMENT - ECM UPGRADE (SA165) - This bulletin provides information related to an inspection of the current ECM ROM ID and, if necessary, an upgrade of the ECM software on some 2015MY K900 vehicles, produced from January 24, 2014 through April 10, 2014, which may not have the latest version ROM ID installed.
