Detroit DD16 GHG14 (2014-16) Fault Code: SPN 3843 FMI 4 (MCM, CPC) Digital Input 1 01 – Indicated By a Short to Ground on Pin 1 Circuit of the Common Powertrain Controller #1 Connector

Posted by PerDiezel Solutions on April 23, 2026

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 1 of the CPC4 #1 connector.

WARNING!