Diagnostic Trouble Code (DTC) Information

Condition

Fig 1: Identifying Body Sensor Cluster Stability Sensor (BSC)

Courtesy of VOLVO CARS CORPORATION

NOTE: The diagnostic trouble code (DTC) applies only to cars with dynamic stability and traction control (DSTC).

The yaw rate sensor, lateral acceleration sensor and the accelerometer (only AWD) are integrated in the body sensor cluster stability sensor (BSC). This in turn is connected to the brake control module (BCM) via its own Control area network (CAN) cable. The sensors transmit information to the brake control module (BCM) indicating the size of the yaw angle, the lateral acceleration of the car and the forward acceleration.

Diagnostic trouble code (DTC) BCM-0121, BCM-0125 or BCM-0129 is stored, depending on the sensor, if the control module registers that the signal from any of the sensors is outside its permitted range.

BCM-0121: Yaw rate sensor
BCM-0125: Lateral acceleration sensor
BCM-0129: Accelerometer.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value

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

HINT: BRAKE SYSTEM, ABBREVIATIONS

Possible Source

Interference or noise on the wiring has disrupted the calculations in the body sensor cluster stability sensor (BSC)
Internal fault in the body sensor cluster stability sensor (BSC).

NOTE: This diagnostic trouble code (DTC) is not due to an internal hardware fault in the Brake control module (BCM) and must not be remedied by replacing the control module.

Fault symptom[s]

The information lamp is lit
Traction control does not function
The stability control system does not function.