Circuit/System Verification

WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Ignition - On/Vehicle - In Service Mode
Verify there are no DTCs set related to the following component/system: K69 Transfer Case Control Module
- If a related DTC is set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If a related DTC is not set
Verify the scan tool can communicate with the following component: K69 Transfer Case Control Module
- If the scan tool cannot communicate with the component
  Refer to: Symptoms - Data Communications
- Go to next step: If the scan tool can communicate with the component
Verify that no DTCs are set.
- If any DTC is set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no DTC is set
All OK.