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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 P091, Transaxle Range Switch Problem >> Failure Conditions
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Failure Conditions

Park/neutral input and Park/Neutral indication from IPC are not the same, or engine starts with no Park/Neutral input, or PRNDL indication from IPC is illegal, or vehicle is in fourth gear, engine speed divided by vehicle speed is between 23 RPM/MPH and 35 RPM/MPH, and park/neutral input indicates in Park/Neutral.

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