Conditions for Setting the DTC
WARNING: This page is about a different car, the 2018 GMC Terrain and 2018 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
B127C 02
The radio detects a short to ground in the microphone high signal circuit for 5 s or greater.
B127C 04
The following conditions will set this DTC:
- The radio detects an open/high resistance in the microphone high signal circuit for 10 s or greater.
- The radio detects an open/high resistance in the microphone low signal circuit for 10 s or greater.