N182198330 - Service Update - Certain 2017 and 2019 model year Chevrolet Cruze vehicles, 2018 model year Chevrolet Malibu vehicles, 2018 model year GMC Terrain vehicles, and 2019 model year Buick Cascada vehicles may have been built with an Engine Control Module (ECM) that does not respond to on board diagnostic (OBD) test tools with the required calibration verification numbers. These ECM?s may not diagnose memory faults and take designed fail-safe remedial actions. Dealers are to reprogram the ECM with the latest calibration.
