Circuit DescriptionThe engine control module (ECM) has internal diagnostics that continuously run and check for software errors or incompatibilities.

Component LocationThe ECM mounting location varies, depending on the engine model, and may be mounted either on or off the engine.

Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position.Conditions for Setting the Fault CodesThis fault code is triggered when the internal ECM diagnostics detect a software or calibration error.

Action Taken When the Fault Code is ActiveThe ECM illuminates the red STOP ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.The engine may not start.Conditions for Clearing the Fault CodeTo validate the repair, start the engine and let it idle for 1 minute.The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.The ECM will turn off the red STOP ENGINE lamp after the diagnostic runs and passes.For On-Board Diagnostic (OBD) engines, the ECM will turn off the MIL after three consecutive trips where the diagnostic runs and passes.The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop TalkPossible causes of this fault code include:

A malfunction of the ECM software or calibration error.

Possible Cause:1) N/A