DESCRIPTION:Vehicle speed sensor erratic.

MONITORED PARAMETER:Vehicle Speed Sensor (VSS)

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 electrical issue on truck.4. Vehicle speed sensor.5. Vehicle speed sensor harness/connector.