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Home >> Geo >> 1991 >> Metro LSi, 4D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Code Charts >> Code 24, Vehicle Speed Sensor Circuit
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Code 24, Vehicle Speed Sensor Circuit

ECM supplies a B+ signal to Vehicle Speed Sensor (VSS). While vehicle is moving, a reed switch inside VSS will open and close, toggling B+ signal high and low.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. If speedometer is inoperative, this could cause Code 24.
  2. Checks if ECM is supplying B+ to VSS.
  3. The VSS on the back of instrument panel will toggle B+ signal high and low. Code 24 will set under the following conditions: fuel is cut for 4 seconds or longer, engine speed is less than 4000 RPM, and vehicle speed is less than one MPH.
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