GM OBD Trouble Code 24

Vehicle Speed Sensor Error (Open Circuit or No Activity)

The Vehicle Speed Sensor signals to the ECM the current speed at which the vehicle is traveling. The ECM uses this information to help determine the correct gear ratio for the transmission and when to engage the transmission torque converter lock-up.

Fault Code Description

  • 24 - Vehicle Speed Sensor error (open circuit or no activity)


  • Erratic operation of speedometer, transmission, and cruise control

Common Problems

  • The most common cause for a code 24 is a wiring issue between the Vehicle Speed Sensor in the transmission or 4WD transfer case and the ECM
  • If the speedometer is working, the Vehicle Speed Sensor is probably working

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