Detroit DD15 GHG14 (2014-16) Fault Code: SPN 1121 FMI 19 (CPC) Service Brake Switch Signal from EBC1 is Erratic
NOTE: Please see the step by step troubleshooting procedures for this specific code.
NOTE: If codes 168-0, 168-14, or 168-18 are present, fix those first.
NOTE: If code 625-9 is present, fix that first.
NOTE: If the ECM hasn’t been configured or programmed recently, then check all other modules on the truck (Cab, ABS, Transmission, etc…) for errors. Repair those as needed.
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