Diagnostic Aids

DTC 24 will set when no vehicle speed is detected at vehicle start off. DTC 72 will set when vehicle speed has been detected and is lost.

Fig 1: DTC 24 Schematic ("G" Series - 4L60-E) VSS Circuit Low (Transmission Output Speed Signal)

Fig 2: DTC 24 Schematic ("G" Series - 4L80-E) VSS Circuit Low (Transmission Output Speed Signal)

Fig 3: DTC 24 Schematic ("P" Series - 4L80-E) VSS Circuit Low (Transmission Output Speed Signal)

Fig 4: DTC 24 Flow Chart (All Models) VSS Circuit Low (Transmission Output Speed Signal)