Conditions for Setting the DTC
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
The 4th clutch is commanded OFF for 3 seconds and the HPCM detects the clutch 4 slip speed is less than 80 RPM for 3 seconds, when commanded OFF.