Transmission Control Module

WARNING: This page is about a different car, the 2000 Cadillac Catera. However, it is still accessible from the selected car via links, so may be relevant.

The Service Transmission Lamp (STL) is illuminated
The TCM sends a MIL request to the ECM on the second consecutive drive trip that the diagnostic runs and fails. The ECM then illuminates the MIL
The transmission operates in the Default Mode:
- Maximum line pressure
- Command 4th gear
- Inhibit TCC
- Freeze shift adapts