Diagnostic Aids

Scan tester reading should closely match speedometer reading with drive wheels turning. If vehicle is equipped with an automatic transmission, check park/neutral switch adjustment. If no problem is found while using flow chart, see INTERMITTENTS in TESTS W/O CODES article in this section.

Fig 1: CODE 24, Schematic, VSS (4.3L C, K & P Series W/ M/T)

Fig 2: CODE 24, Schematic, VSS (4.3L Turbo)

Fig 3: CODE 24, Flowchart, Vehicle Speed Sensor (VSS)