VOLVO
BCM-0123 - Active yaw control sensor. Internal fault
System
Brake Control Module (BCM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (10)
- Volvo S60 (2001–2009)2002–2009
- Volvo S80 (1999–2006)2002–2006
- Volvo V70 (2000–2008)2002–2008
- Volvo V70 XC / XC70 (2001–2007)2002–2007
- Volvo XC90 (2003–)2003–2004, 2015
- Volvo XC90 (2003–)2005–2006All engines except: B8444S
- Volvo XC90 (2003–)2007Engine B5254T2, D5244T4 only
- Volvo XC90 (2003–)2008–2010All engines except: B6324S, B8444S
- Volvo XC90 (2003–)2011All engines except: B6324S5, B8444S
- Volvo XC90 (2003–)2012–2014All engines except: B6324S5
What does this fault code mean?
The brake control module sets the code if the voltage to the AYC sensor is outside its reference value, or if the sensor itself has registered an internal fault. The cause may be signals that disturb the sensor, too low a voltage or an internal fault in the AYC sensor.
Possible causes
- Signals that disturb the AYC sensor
- Voltage to the AYC sensor too low
- Internal fault in the AYC sensor
What you can do
- 1Check the connectors at the brake control module and the AYC sensor for contact resistance and oxidation
- 2Read the sensor's current values with diagnostic equipment and compare them with normal values for each sensor
- 3If the voltage is wrong, the control module needs checking; if the voltage is correct, have a workshop check the AYC sensor
- 4The brake system is safety critical: do not replace the brake control module unless a fault is confirmed, and drive carefully until the fault is fixed
Symptoms you may notice5
- General yellow warning lamp on
- Anti-spin does not work
- Stability function does not work
- Anti-skid does not work
- Traction control does not work
What the fault can affect1
- Traction control (TC), stability control (SC) and active yaw control (AYC) are disabled
General guidance for car owners. Diagnosis on the car can point to a different cause.