Detroit DD16 GHG14 (2014-16) Fault Code: SPN 3840 FMI 4 (CPC) Frequency Output 4 15 – Indicated By a Short to Ground on Pin 15 Circuit of the Common Powertrain Controller #4 Connector

NOTE: Please see the step by step troubleshooting procedures for this specific code.

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 #4 connector.