Detroit DD15 EPA07 (2007-09) 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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