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Home >> Buick >> 1995 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.2L >> ECM/Pcm Code Charts >> Code 24: Vehicle Speed Sensor >> Notes
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Code 24: Vehicle Speed Sensor: Notes

Speed sensor, which is a Permanent Magnet (PM) generator, provides control module with vehicle speed information. PM generator, mounted in transmission, produces a pulsing AC voltage signal whenever vehicle speed is greater than about 2 MPH. Voltage level and pulses increase with vehicle speed. Control module converts pulsing voltage to MPH, which is used by control module to calculate vehicle adjustments.

NOTE: Test numbers refer to numbers on diagnostic chart.
NOTE: Prior to testing Corvette for Code 24, disable ASR system.
  1. PM generator only produces a voltage signal if drive wheels are turning greater than about 2 MPH.
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