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.
Verify That No DTCs Are Set, Except DTC P061C.
- If Any Other DTC Is Set, Except DTC P061C
  Refer To Diagnostic Trouble Code (DTC) List - Vehicle .
- Go To Next Step: If Only DTC P061C Is Set
Replace The K44 Power Take - Off Control Module.
Verify DTC P061C Does Not Set When Operating The Vehicle Within The Conditions For Running The DTC.
- If The DTC Sets
  Replace The K20 Engine Control Module.
- Go To Next Step: If The DTC Does Not Set
All Ok.