Circuit/System Testing

Verify that no other DTCs are set except for P0856.
- If any other DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If only DTC P0856 is set
Replace the K20 engine control module.
Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.
- If DTC sets
  Replace the K17 electronic brake control module.
- If DTC does not set
All OK.