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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 84 FMI 19 (CPC) J1939 Wheel-Based Vehicle Speed Signal (VSS) from Source #1, #2, Or #3 is Erratic

DESCRIPTION:
Wheel-based vehicle speed signal from source #1, #2, or #3 is erratic.

MONITORED PARAMETER:
Vehicle speed sensor.

TYPICAL ENABLING CONDITIONS:
1. Rpm greater than 1500.
2. Torque demand on.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
10 seconds

DASH LAMPS:
MIL

ENGINE REACTION:
None

VERIFICATION:
1. RPM greater than 1500.
2. Torque demand on.

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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