Vehicle Speed Sensor
2014 Jeep Wrangler · 3.6L V6
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Mounted on transmission tail housing (automatic) or transfer case output (manual transmission), reading from output shaft tone ring
Pins
2-pin connector
Timebase
20ms/div at low speeds (under 20 mph), 10ms/div at highway speeds
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
White/Orange (signal output to PCM/instrument cluster) and Black/Light Blue (sensor ground)
Expected Voltage Range
At Idle
0V to 5V
At Higher RPM
0V to 5V
Expected Pattern
Digital square wave switching between 0V and approximately 5V. 8 pulses per driveshaft revolution, frequency proportional to vehicle speed
Known-Good Waveform
Clean digital square wave with sharp rising and falling edges between 0V and 5V. At 30 mph, expect approximately 60-70 Hz depending on final drive ratio and tire size. Signal frequency should increase smoothly and proportionally with vehicle speed without dropouts or missing pulses.
Common Failure Patterns
No signal output, flat line at 0V or 5V
Cause: Failed VSS, open or shorted circuit, corroded connector at sensor or PCM
Intermittent signal with random dropouts or erratic frequency not matching actual speed
Cause: Damaged tone ring on output shaft, excessive endplay in output shaft bearing, loose sensor mounting
Weak amplitude or rounded waveform edges instead of crisp square wave
Cause: Sensor failing internally, high resistance in wiring or connections, or excessive air gap to tone ring
Related DTCs: P0500
Diagnostic Tips
On 2012-2018 JK Wranglers, speedometer and VSS accuracy is affected by tire size changes. PCM stores tire circumference parameters that may need reprogramming after lift/tire modifications. VSS connector is exposed to road splash and commonly corrodes - clean with electrical contact cleaner and apply dielectric grease.
Related Diagnostic Trouble Codes
P0500P0501P0502P0503
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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