22150 - SERVICE UPDATE. THIS BULLETIN PROVIDES A SERVICE PROCEDURE TO REPROGRAM THE ENGINE CONTROL MODULE (ECM) ON CERTAIN 2016 MODEL YEAR CADILLAC ATS OR CADILLAC CTS VEHICLES EQUIPPED WITH 3.6L HFV6 ENGINE (RPO LGX). THESE VEHICLES MAY EXPERIENCE A FLASHING MALFUNCTION INDICATOR LAMP (MIL) WITH AN ENGINE MISFIRE DTC WHICH COULD RESULT IN REDUCED ENGINE PERFORMANCE AND/OR PERMANENT ENGINE DAMAGE.
