N192268880 - Emissions - General Motors has decided to conduct a voluntary emission recall involving certain 2016-2018 Chevrolet Spark vehicles. In the unlikely event that a memory bank in the transmission control module (TCM) becomes faulty, the TCM may not illuminate the malfunction indicator lamp (Check Engine Light) and may not set a diagnostic trouble code (DTC). In addition, if this condition were to occur, certain transmission diagnostic tests may not function properly, and an engine revving sound might be heard during vehicle acceleration and deceleration. Dealers are to reprogram the TCM with modified software.
