Notes On Intermittents

WARNING: This page is about a different car, the 1995 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

Due to complexity of the 4T80-E transaxle, an intermittent PCM Code P089 will be very difficult to diagnose. Hold off maintenance until specific problem is identified.

Fig 1: Code P089 Schematic, Long Shift And Maximum Adapt

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Fig 2: Code P089 Diagnostic Flow Chart - 1 Of 2, Long Shift And Maximum Adapt

Courtesy of GENERAL MOTORS CORP.

Fig 3: Code P089 Diagnostic Flow Chart - 2 Of 2, Long Shift And Maximum Adapt

Courtesy of GENERAL MOTORS CORP.