TCM Adaptation - 8HP45

The 8HP45 transmission continuously self calibrates and learns shift points and clutch apply times. It is necessary to perform a drive cycle to provide the proper baseline transmission adaptation. The adaptation procedure should be performed if any of the following procedures are performed:

• Transmission Assembly Replacement
• Transmission Control Module Assembly (TCMA) Replacement
• Internal Transmission repairs.
• Torque Converter Replacement.

1. With the scan tool, clear any DTCs that may be set.
2. Drive the vehicle until the vehicle temperature is greater than 30°C (86°F).
3. After the vehicle has reached normal operating temperature, and with the scan tool, monitor actual gear state. Drive the vehicle normally with the accelerator pedal between 10% and 20% until 7th gear has been achieved, approximately 76 km/h (47 mph). After 7th gear has been achieved, coast down to 30 mph with no application of the brake or accelerator to allow a 6-5 shift. Brake the vehicle to a stop. Repeat this procedure 5 times.