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.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

8HP45

Use the Manual With the Right Hardware

When to See a Mechanic