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Home › Cadillac › 1995 › DeVille Base › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - 4.9L › Pcm Code Charts › Code P027, Open Throttle Position Switch Signal › Action

Code P027, Open Throttle Position Switch Signal: Action

PCM turns on MIL and disables EGR.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. PCM harness connector to ISC jumper is located between generator and cruise control servo.
  2. ISC jumper is a separate harness that connects the ISC to PCM harness.
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