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Detroit DD15 EPA07 (2007-09) 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.

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