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Park/Neutral (P/N) Switch (C-1)

  1. Disconnect P/N switch harness connector. Connect ohmmeter between the P/N switch terminals. See Fig 1 . Continuity should be present only when gear shift selector is in Park or Neutral. If continuity is not present, check P/N switch adjustment or replace defective P/N switch.
  2. With park/neutral switch connector disconnected, turn ignition on. Check for 12 volts on the Orange/Black wire of park/neutral switch harness. If 12 volts are not present, check for open or short to ground between switch harness connector and ECM.
Fig 1: Park/Neutral (P/N) Switch Circuit (Typical)
G90C09030Courtesy of GENERAL MOTORS CORP.
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