Circuit/System Verification
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.
- Ignition - On / Vehicle - In Service Mode
- Perform the scan tool control function: Sensor Supply Voltage Relay - On and Off
Verify a click can be heard or felt at the component when the scan tool control function was commanded: KR121A Reductant Control Module Relay 1 & KR121B Reductant Control Module Relay 2
- If a click cannot be heard or felt
Refer to: Circuit/System Testing
- Go to next step: If a click can be heard or felt
- If a click cannot be heard or felt
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
Refer to: Circuit/System Testing
- Go to next step: If the DTC is not set
- If the DTC sets
- All OK.