Check ENG or Service ENG Soon (SES) Malfunction IND LP (MIL) Operation

The CHECK ENGINE or the SERVICE ENGINE SOON (varies by model) Malfunction Indicator Lamp (or MIL) is located in the Instrument Panel Cluster (IPC). The MIL is controlled both by the AF ECU and the gasoline Control Module (VCM/PCM or ECM). The MIL is used to indicate that a control module (AF ECU, VCM / PCM or ECM) has detected a problem that affects vehicle emissions, may cause powertrain damage, or severely impacts driveability.