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Home >> Chevrolet >> 1987 >> Chevette 2D Hatchback, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Overhaul - 180C/3L30 >> Testing >> Control Pressure Test Results >> Control Pressure Too High

Control Pressure Too High

Modulator vacuum line leaking or interrupted.
Failed vacuum modulator.
Vacuum leak in engine or accessory vacuum system.
Pressure regulator valve malfunction.

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