18288 - Cutomer Satisfaction Program. On certain 2016 model year Cadillac ATS-V vehicles that are equipped with a twin turbocharged engine (RPO LF4) and a manual transmission (RPO MG9), the Engine Control Module (ECM) does not illuminate the Malfunction Indicator Lamp (MIL), and does not set a diagnostic trouble code, as required when a malfunction causes the air-fuel mixture in one combustion cylinder of the engine to differ from other cylinders. Reprogram the ECM with updated software.
