Service Fast Learn Adapts: Notes

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Service Fast Learn Adapts is a procedure for 6 speed automatic transmissions in which a series of tests are run to allow the transmission control module (TCM) to learn individual clutch characteristics. Once the clutch data is learned, Service Fast Learn Adapts translates it into the adaptive data cells, which the TCM uses for clutch control during shifts. The scan tool provides initiation of the Service Fast Learn Adapts procedure. This procedure is to be used following transmission repair.

The Service Fast Learn Adapts procedure must be performed when one of the following repairs have been made to the vehicle. Failure to perform the procedure after one of the following repairs may result in poor transmission performance, as well as transmission DTCs being set:

Transmission internal service/overhaul
Valve body repair or replacement
Control solenoid (w/body and TCM) valve assembly replacement
TCM software/calibration update
Any service in response to a shift quality concern

IMPORTANT: Ensure the following conditions are met before performing the Service Fast Learn Adapts procedure:

Drive wheels are blocked
Parking brake is applied
Service brake is applied
Zero percent throttle and no external engine RPM control
Transmission fluid temperature (TFT) is between 70-100°C (158-212°F)
Transmission gear selector has been cycled from Park to Reverse 3 times in order to purge air from the reverse clutches.

Using the scan tool, navigate to Service Fast Learn Adapts commands.
1. F1: Transmission Control Module
2. F5: Module Setup
3. F0: Fast Learn Adapts Process

IMPORTANT: If at any time during the procedure, required conditions are not met, Service Fast Learn Adapts may abort and the process may need to be started again from the beginning.

IMPORTANT: There are 3 stages required to successfully complete the Service Fast Learn Adapts procedure:

Use the scan tool to perform the Service Fast Learn Adapts procedure.
1. PARK test setup
2. DRIVE mode
3. REVERSE mode
  These stages are automatically initiated and controlled by the scan tool. As the procedure is being performed, the scan tool data display will provide operator instructions. Follow the scan tool instructions as required. For a brief description of each stage, refer to PARK Test Setup , DRIVE Mode , and REVERSE Mode below.
Once the procedure is complete, shut OFF the engine and power down the TCM. You will lose communication to the scan tool.
Restart the engine. This will complete the Service Fast Learn Adapts procedure.

The following are brief descriptions of each of the 3 different stages.