Vehicle Speed Sensor
2011 Ford F-150 · 5.0L V8 Coyote
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Mounted on rear of transmission tailhousing on 6R80 automatic transmission
Pins
3-pin connector
Timebase
20ms/div at 25 mph
Voltage Scale
5V/div
Trigger
6V, rising edge
Wiring
Gray/Black wire (signal output to PCM pin 32), Orange/Light Blue wire (12V power), Black wire (ground)
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0.2V to 12V
Expected Pattern
Digital square wave switching between 0V and 12V, frequency proportional to output shaft speed, 8 pulses per output shaft revolution
Known-Good Waveform
Clean digital square wave transitioning sharply between near 0V and 11-12V with approximately 50% duty cycle. At 25 mph in 6th gear, expect frequency around 80-100 Hz. Signal frequency should increase proportionally with vehicle speed and change with gear shifts as output shaft speed changes.
Common Failure Patterns
No signal, voltage stuck at 0V or 12V
Cause: Failed VSS Hall-effect sensor, no power supply to sensor, or open signal wire
Erratic signal with inconsistent pulse width or rounded edges
Cause: Low voltage supply to sensor (check for 11-14V), corroded connector at transmission, or failing sensor
Diagnostic Tips
The 6R80 transmission in F-150s uses a Hall-effect VSS unlike older Ford vehicles with VR sensors - verify 12V supply before condemning sensor. Compare VSS signal frequency to ABS wheel speed sensor data to verify accuracy. Check for TSB 13-5-10 regarding erratic speedometer operation on 2011-2013 models.
Related Diagnostic Trouble Codes
P0500P0501P0502P0503
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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