Detroit DD15 GHG14 (2014-16) Fault Code: SPN 70 FMI 19 (CPC) Park Brake Switch Signal from Source #1, #2, or #3 is Erratic

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

NOTE: If codes for other modules are present, fix those first.

PROBABLE CAUSES:
1. Improper programming of the CPC (Common Powertrain Controller).
2. Other failed modules on the truck (Transmission, ABS, Cab controller, etc…).
3. Battery/battery cable issues, or electical issue on truck.