Conditions for Setting the DTC

WARNING: This page is about a different car, the 2008 Suzuki Swift +, 2008 Pontiac Wave, and 2008 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.

The system voltage is too high.
The transmission control module (TCM) detects that the voltage is greater than 18 volts for 0.5 second continuously.
The engine revolution is 600 RPM or greater.