Circuit DescriptionThe ECM continuously monitors the engine’s fault code status to determine if any fault codes critical to successful engine operation are active.

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 engine is running.

Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the engine has been operated for an extended amount of time with critical SCR faults active, and no repair action has been taken. This amount of time will vary, depending on which SCR faults are active.

Action Taken When the Fault Code is ActiveThe ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.Engine Torque will be reduced.Vehicle speed will be limited to 8 km [5 mi] per hour.Conditions for Clearing the Fault CodeThis fault code will go inactive once all other active fault codes have been addressed. Refer to the appropriate fault code troubleshooting tree.The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.

Shop TalkThis fault code is for information only, and indicates that an engine power derate and vehicle speed limit have been implemented in order to make sure that the critical SCR related fault codes that are presently active in the ECM are addressed as quickly as possible.

Possible Cause:1) ECM calibration