Transmission Service Fast Learn

The Transmission Service Fast Learn procedure has been a required programming procedure on some current 6-speed transmissions.

Transmission Service Fast Learn is a procedure that is performed after any 8-speed transmission repair.
The procedure performs a series of tests which allow the TCM to learn individual clutch apply pressures.
These learn pressure values are used by the TCM for clutch control and timing of shifts. A scan tool is used to perform the Transmission Service Fast Learn procedure.

The Transmission Service Fast Learn procedure must be performed when any of the following repairs has been made to the transmission.

Pressure regulating solenoid replacement
Valve body repair or replacement
Any service/repair in response to a shift quality concern
Any internal transmission service, repair, overhaul, or replacement
Torque converter replacement
TCM replacement
Transmission assembly replacement

Failure to perform the procedure may result in poor transmission performance, DTCs being set, or customer dissatisfaction.

Transmission Service Fast Learn Procedure

If a pressure regulating solenoid, TCM or transmission assembly was replaced, perform the Solenoid Valve Characterization Reprogramming.
With the ignition on, clear the DTCs with a scan tool.
Turn the ignition off and make sure all vehicle systems turn off.

It may take up to two minutes for all vehicle control modules to power down.

TIP:
If the transmission fluid temperature is not between 167°F (75°C) and 185°F (85°C), the scan tool will not allow you to perform the Service Fast Learn procedure.

With the engine running, shift the transmission to the Drive position with the brake applied. Perform the Service Fast Learn procedure with a scan tool.

In GDS 2, go to Module Diagnostics > Transmission Control Module > Configuration/Reset Functions > Transmission Service Fast Learn.
Follow the instructions on the scan tool.

Turn the Ignition off for two minutes.