This bulletin applies to 2018 Cadillac XT5 vehicles and three potential areas of concern regarding the electric parking brake system.
Condition 1:
Customers may comment that the electric parking brake is inoperative. DTCs may be set in the electric brake control module including C028F (left park brake actuator circuit short to ground) and/or C1586 (right park brake actuator circuit short to ground).
This may be caused by water leaking into the rear actuator.
Condition 2:
The electric parking brake may be inoperative. The technician may find evidence of a previous brake actuator repair. The cause may be a software anomaly.
Condition 3:
The Service Park Brake lamp may be on. DTCs may include C1587 (left park brake actuator software sensitivity) and/or C1588 (right park brake actuator software sensitivity). This may be caused by a weak battery.
If DTCs C028E and/or C1586 are set, verify which EPB actuator set the DTC and replace the actuator. Note: When replacing the actuator, verify that the new actuator features the updated/new design cover. If DTCs are not set, and/or the brake actuators have previously been replaced, program the EBCM to the latest available calibration. If DTCs C1587 or C1588 are set, program the EBCM to the latest calibration.
