Conditions for Setting the DTC

WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

The CIM detects an open, short to ground or short to voltage in the cellular microphone signal circuit for 10 seconds or greater.
The CIM detects an open/high resistance in the drain wire circuit for 10 seconds or greater.