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.

Verify the condition does not exist:Incorrect fluid level or condition - Refer to:Transmission Fluid Level and Condition Check
- If a condition exists
  Repair or replace as necessary
- Go to next step: If no condition exists
Ignition - On/Vehicle - In Service Mode
Clear DTCs
Road test the vehicle. - Refer to:Road Test
Verify DTC P0716, P0717, P0721, P0722, P0723, P0741, P077C, P077D, P07BF, P07C0, P172A, P172B, P176B, P176C, P176D, P1783, P178F, P17C5, P17C6, P17CC, P17CD, P17CE, P17D3, P17D6, P2817, P2818 is not set.
- If any of the DTCs are set
  Refer to:Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If none of the DTCs are set
Verify DTC P2820 is not set.
- If DTC P2820 is set
  Refer to:Diagnostic Fault Information
- Go to next step: If DTC P2820 is not set
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 DTC P0716, P0717, P0721, P0722, P0723, P0741, P077C, P077D, P07BF, P07C0, P172A, P172B, P176B, P176C, P176D, P1783, P178F, P17C5, P17C6, P17CC, P17CD, P17CE, P17D3, P17D6, P2817, P2818 is not set.
- If any of the DTCs are set
  Refer to:Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If none of the DTCs are set
Verify DTC P2820 is not set.
- If DTC P2820 is set
  Refer to:Diagnostic Fault Information
- Go to next step: If DTC P2820 is not set
All OK.