Circuit/System Verification

Verify that no other DTCs are set except for DTC P1B12 is set.
- If any other DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If no other DTCs are set
Replace the K17 Electronic Brake Control Module.
Verify the DTC P1B12 does not set while operating the vehicle within the Conditions for Running the DTC.
- If only DTC P1B12 is set
  Replace the K20 Engine Control Module.
- Go to next step: If the DTC does not set
All OK.