P0500 No Vehicle Speed Sensor Signal

SYMPTOM
P-0500 NO VEHICLE SPEED SENSOR SIGNAL

TEST NOTE
All symptoms listed above are diagnosed using the same tests. The title for the tests will be P-0500 NO VEHICLE SPEED SENSOR SIGNAL.

WHEN MONITORED 1
The Vehicle Speed Signal test is run when the Engine boost is greater than 7 psi and the Engine rpm is above 1024 rpm but less than 2784 rpm.

SET CONDITION 1
The code is set if no Vehicle speed is received from the CAB Module for more than 15 seconds for 2 consecutive trips.

WHEN MONITORED 2
With the Engine running, Automatic Transmission in drive, and Output shaft speed greater than 64 rpm, ECT above 104°F, MAP vacuum 15 to 16" and Engine rpm greater than 1500.

SET CONDITION 2
This code will set if no Vehicle Speed Signal is received from the CAB (Controller Antilock Brakes) Module for more than 15 seconds for 2 consecutive trips.

POSSIBLE CAUSES
- Cab module diagnostic trouble codes
- Vehicle speed signal circuit open
- Vehicle speed signal circuit shorted to voltage
- Controller antilock brakes defective
- PCM defective (no vehicle speed sensor signal)
- Vehicle speed sensor wiring harness observable defect
- Vehicle speed signal circuit short to ground