Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Brake Control Module & Active Yaw Control Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The active yaw control sensor is supplied with 12 V. The signal voltage of the sensors to the brake control module (BCM) is approximately 2.5 V for a stationary car. The control module compares the voltage with a reference value.

Diagnostic trouble code (DTC) BCM-0123 is stored if the voltage is outside the reference value or if an internal fault in the active yaw control sensor is registered.

Substitute Value 

• Traction control is blocked
• Stability control is blocked
• Active yaw control is blocked.

HINT: For information about abbreviations, see  Brake system, abbreviations  . 

Possible Source 

• Signals which disrupt the active yaw control sensor
• Voltage to the active yaw control sensor is too low
• Internal fault in the active yaw control sensor.

Fault symptom[s] 

• The anti-spin warning lamp is lit (up to and including 2002 model year)
• General yellow warning lamp lit (from model year 2003 inclusive)
• Anti-spin does not function
• The stability control system does not function
• The traction control system does not function.