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1995
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DeVille Base
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Engine Controls - Tests W/Codes - 4.9L
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Pcm Code Charts
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Code P066, Cruise Control Engine Rpm Too High
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Action
Code P066, Cruise Control Engine Rpm Too High: Action
PCM disengages cruise control.
Fig 1: Code P066 Schematic, Cruise Control Engine RPM Too High
Courtesy of GENERAL MOTORS CORP.