Conditions for Running the DTC
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
P16D7, P16D8
- Battery Voltage = Greater than 11 V
- KR121A Reductant Control Module Relay 1 = Commanded Off
- KR121B Reductant Control Module Relay 2 = Commanded Off
Frequency the DTC runs = Continuously - After the running conditions are met
P16D9
- KR121A Reductant Control Module Relay 1 = The component is commanded On.
- KR121B Reductant Control Module Relay 2 = The component is commanded On.