Trouble Shooting
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
If Fast Learn will not run and the above-stated conditions have been met, ensure the following:
- Transmission fluid temperature at 40-100°C.
- Closed throttle and engine at warm-idle RPM.
- No active DTCs.
- All speed sensors are connected and functioning properly.
- NSBU switch properly adjusted and functioning.
- Main pressure within specification.
- TCC slip speed less than 100 RPM at idle in park/neutral.