Detroit DD15 GHG14 (2014-16) Fault Code: SPN 84 FMI 4 (MCM) Vehicle Speed Sensor Circuit Failed Low

DESCRIPTION:
Vehicle speed sensor circuit failed low.

MONITORED PARAMETER:
Vehicle Speed Sensor (VSS).

TYPICAL ENABLING CONDITIONS:
Always Enabled

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Always Enabled

TYPICAL DURATION:
2 seconds

DASH LAMPS:
MIL

ENGINE REACTION:
None

VERIFICATION:
Engine Idle (1 minute).

PROBABLE CAUSES:
1. Vehicle speed sensor.
2. Wiring between vehicle speed sensor and ECM.

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