Note On Intermittents

Check for Electromagnetic Interference (EMI) induced on circuits No. 400 and 401 by running them close to spark plug wires or high power transmitters (like mobile radios) operating in vicinity.

Fig 1: Code P024 Schematic, Vehicle Speed Sensor (VSS) Circuit Problem

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P024 Diagnostic Flow Chart, VSS Circuit Problem

Courtesy of GENERAL MOTORS CORP.