Diagnostic Aids

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

Verify that the input speed sensor (ISS) and the output speed sensor (OSS) are functioning properly.
In 3rd gear at approximately 64 km/h (40 mph), command TCC ON. If functioning properly the OSS will track ISS and the engine RPM.
If not, refer to DTC P0716 for the ISS and DTC P0723 for the OSS.