Faulty Vehicle speed sensor
Vehicle speed sensor harness is open or shorted
Vehicle speed sensor electrical circuit poor electrical connection
Noise on the VSS input signal from the radio frequency interference or electro magnetic interference
External sources, such as ignition wires, the charging circuit or aftermarket equipment
Engine Light ON (or Service Engine Soon Warning Light)
The P1501 code Indicates the Vehicle Speed Sensor (VSS) input signal is out of self-test range. If the Powertrain Control Module (PCM) detects a VSS input signal any time during the self-test, DTC P1501 is set and the test aborts.