Diagnostic Aids

Intermittent may be caused by rubbed-through insulation, or a wire broken inside the insulation. Check ECM harness connectors for backed-out or damaged terminals. If code is intermittent, see TESTS W/O CODES article in this section.

Fig 1: Code 42 Schematic (GSi), Vehicle Speed Sensor Circuit

Fig 2: Code 42 Flow Chart (GSi), Vehicle Speed Sensor Circuit