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Home >> Cadillac >> 1991 >> Seville Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> Pcm Code EO91, Park/Neutral Switch Problem (1 Of 2) >> Failure Conditions:

Failure Conditions:

An open or short to ground in one or more switches or circuits that would generate an invalid binary code. An engine start with a code recognized by the PCM as one a forward or reverse gear.