DTC B1111-77: Electronic Park Brake Enable - Commanded Position Not Reachable: Action

Refer to the appropriate system wiring diagram and check the electric park brake actuator circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Clear the DTC and re-test
Switch ignition off and on. Apply and release the electric park brake using the electric park brake switch. Clear the DTC and re-test. If the fault is not reset, suspect electric park brake actuator fault. Install a new electric park brake actuator as necessary
Refer to the appropriate system wiring diagram and check the power supplies and ground connections to the electric park brake control module. Test the battery voltage and charging system. Repair wiring harness or charging system as necessary. Clear the DTC and re-test. Perform battery reset and re-test system
Switch ignition off and on. Apply and release the electric park brake using the electric park brake switch. Clear the DTC and re-test. If the fault is not reset, suspect brake caliper fault. Install a new brake caliper as necessary