Conditions for Setting the DTC

WARNING: This page is about a different car, the 2014 GMC Yukon XL 1500, 2014 GMC Yukon, 2014 Chevrolet Tahoe, and 2014 Chevrolet Suburban 1500. However, it is still accessible from the selected car via links, so may be relevant.

The TCCM tests the motor circuits by checking for unexpected voltage.
The TCCM supplies voltage on each of the motor circuits and reads the voltage back on the other circuit.
If the TCCM detects a low voltage return when a high voltage is expected or a high voltage return when a low voltage is expected, the DTC is logged.
The fault must remain current for 1 second to set the DTC.