Detroit DD16 GHG14 (2014-16) Fault Code: SPN 84 FMI 2 (CPC) Vehicle Speed Signal Lost

DESCRIPTION:
Vehicle speed signal drops out.

MONITORED PARAMETER:
Vehicle speed sensor (VSS).

TYPICAL ENABLING CONDITIONS:
1. RPM greater than 1200.
2. Torque demand on.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
10 seconds

DASH LAMPS:
None

ENGINE REACTION:
None

VERIFICATION:
1. RPM greater than 1200.
2. Torque on demand.

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.