Soft or Slipping 1-2 Upshifts

SOFT OR SLIPPING 1-2 UPSHIFTS
1. Faulty Powertrain Control Module (PCM) sensor inputs/outputs.
2. Main control assembly gaskets damaged or bolt out of torque.
3. Main control separator plate damaged.
4. Main control Electronic Pressure Control (EPC) solenoid stuck or damaged.
5. Intermediate band adjustment incorrect.
6. Intermediate band friction elements worn.
7. Wrong return spring.
8. Case bore damaged or leaking.