Detroit DD15 GHG14 (2014-16) Fault Code: SPN 84 FMI 2 (CPC) J1939 Wheel-Based Vehicle Speed Signal from Source #1 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.
![International Truck ISIS - Oncommand Service Information Q4.2020 [04.2020]](https://www.ecuforcetruck.com/wp-content/uploads/2022/01/OnCommand-2020-1-300x300.png.webp)
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