Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The components are powered and ignition voltage is greater than 9.0 volts and less than 18 volts.
Loss of TCM supply voltage before drive cycle data is saved.