SPN 629 - FMI 12 (Fault Code 111)

SPN 629 - FMI 12 (Fault Code: 111)
SPN629 FMI12
ISB, ISC, and ISL Electronic Control Module

Fault Code: 111
PID(P), SID(S): S254
SPN: 629
FMI: 12/12
Lamp: RED


REASON: Electronic Control Module Critical Internal Failure - Bad Intelligent Device or Component. Error internal to the electronic control module (ECM) related to memory hardware failures or internal ECM voltage supply circuits.

EFFECT: Engine may NOT start/ running.

Circuit Description:
The ECM has internal diagnostics that continuously run and check the internal memory.

Component Location:
The ECM is located on the fuel system side of the engine.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes:
This fault code is triggered when the internal ECM diagnostics detect a read or write error internal to the module.

Action Taken When the Fault Code is Active:
The ECM illuminates the red STOP ENGINE light immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
The ECM will turn off the red STOP ENGINE light immediately after the diagnostic runs and passes.

Shop Talk:

  • Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
  • This fault code can only be caused by an internal ECM problem. Repairs are not possible for the ECM.

Read More:
SPN 111 FMI 18 (Fault Code 197)
SPN 108 - FMI 4 (Fault Code 222)


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