Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3856 FMI 3 (CPC) Digital Input 2 15 – Failed High on Pin 15 Circuit of the Common Powertrain Controller #2 Connector
NOTE: The common powertrain controller (CPC) digital outputs have the same SPN as some motor control module (MCM) faults.
NOTE: If ECM has been programmed recentely, check programming to ensure it is correct.
NOTE: Otherwise, fix the open circuit on pin 15 of the CPC4 #2 connector.
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