GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: Vehicle moves in the N position

    • Excessive ATF
    • Foreign material in the valve body spacer plate orifice
    • Fluid pressure relief valve inoperative
    • Lubrication control valve inoperative
    • Coast clutch inoperative
    • 1st clutch inoperative
    • 2nd clutch inoperative
    • 3rd clutch inoperative
    • 4th clutch inoperative
    •  5th clutch inoperative
    • Inspect the ATF level. Drain if necessary.
    • Inspect all clutch pressures.
    •  Inspect the clutch piston, the clutch piston check valve, and the O-rings.
    • Inspect the spring retainer for wear and damage.
    • Inspect the clutch backing plate-to-top disc clearance. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs and plates are worn or damaged, replace discs and plates as a set. If the discs and plates are in satisfactory condition, adjust the clutch backing plate clearance.
    • Inspect for incorrect Clutch backing plate clearance.
    • Inspect for Internal bearing seized up, worn, or damaged.
    • Inspect for thrust washer seized up, worn, or damaged.