Vehicle Speed Sensor
2016 Chevrolet Silverado 1500 · 5.3L V8 EcoTec3 L83
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Output shaft of transmission tail housing, driver side on 6L80/8L90 automatic transmission
Pins
3-pin connector
Timebase
50ms/div at 10mph, 10ms/div at 60mph
Voltage Scale
5V/div
Trigger
6V, rising edge
Wiring
Purple wire (12V supply), Black wire (ground), Yellow wire (signal output to ECM/TCM)
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0V to 12V
Expected Pattern
Square wave switching between 0V and 12V, frequency proportional to output shaft speed, 40 pulses per revolution
Known-Good Waveform
Clean square wave with sharp transitions between 0V and battery voltage (12-14V). At 10 mph, expect approximately 5-8 Hz frequency. At 60 mph, frequency increases to 30-50 Hz. Duty cycle should be approximately 50% with consistent on/off times. Signal should have fast rise and fall times (under 1ms) with no ringing or oscillation.
Common Failure Patterns
No signal output, voltage stuck at 0V or 12V
Cause: Failed Hall effect sensor chip, no power or ground to sensor
Intermittent signal dropouts or erratic pulse width
Cause: Damaged reluctor wheel on output shaft, loose sensor mounting, internal transmission mechanical issues
Weak signal with slow rise times or incorrect voltage levels
Cause: Low battery voltage, high resistance in power or ground circuits, failing sensor
Related DTCs: P0500
Diagnostic Tips
The 6L80/8L90 transmissions in these Silverados use a two-wire Hall sensor with external power supply. Verify 12V supply and good ground at sensor connector before condemning sensor. Common issue is transmission fluid leaking into sensor connector causing corrosion - check for ATF contamination in connector. Signal also feeds TCM, ECM, ABS module and instrument cluster.
Related Diagnostic Trouble Codes
P0500P0501P0502P0503
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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