Delayed Park to Reverse/Drive Engagement

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Cause
DEFINITION: Gear engagement that takes longer than 3 seconds when the engine is idling in Park or Neutral and the gear selector is moved to Drive or Reverse range.
Automatic Transmission Fluid Level	Low fluid level
Transmission Main Line Pressure	Low transmission main line pressure
Reverse Band Servo Assembly - Reverse engagement only	The reverse band servo piston oil seal ring (43) is damaged or rolled.
Forward Band Servo Assembly - Drive engagement only	The forward band servo piston oil seal ring (18) is damaged or rolled.
Control Valve Body Assembly - Reverse engagement only	The reverse servo boost valve (367A) is binding or is damaged.
Control Valve Body Assembly - Drive engagement only	The forward servo boost valve (367B) is binding or is damaged.
Control Valve Body Spacer Plate Assembly - Drive engagement only	The thermal element is damaged or is not functioning properly.
TCC Blowoff Ball Valve Assembly	The TCC blowoff ball valve (420) is not seating - causing torque converter drain back.
Input Clutch Assembly	The input clutch housing oil seal rings (628) are damaged or rolled. The input clutch housing assembly (632) sealing surfaces are damaged. The input clutch housing ball check valve assembly (633) is plugged or damaged. The input clutch inner piston seal (634) is damaged or rolled. The input clutch outer piston seal (635) is damaged or rolled. The input clutch piston assembly (636) sealing surfaces are damaged.