Inspect for proper gear oil levels prior to performing system diagnosis.

Low gear oil levels

Fill axle to the recommended level.

A low level may create intermittent or incomplete clutch park engagement.

Incorrect gear oil

Replace with gear oil Saturn P/N 12378514.

Incorrect gear oil may create improper clutch pack engagement or a slippage condition.

Worn clutch pack oil pump

Replace the clutch pack assembly.

Worn clutch pack friction discs

Replace the clutch pack assembly.