Park/Neutral Position (PNP) Switch
- Disconnect PNP switch harness connector. Connect ohmmeter between the PNP switch terminals. See Fig 1. Continuity should be present only when gear shift selector is in Park or Neutral. If continuity is present, go to next step. If continuity is not present, check PNP switch adjustment or replace defective PNP switch.
- With PNP switch connector disconnected, turn ignition on. Check for 12 volts on Orange/Black wire of PNP switch harness. If 12 volts are not present, check for open or short to ground between switch harness connector and PCM.
Courtesy of GENERAL MOTORS CORP.