VOLVO
BCM-0138 - Power supply for the active yaw control sensor. Faulty voltage
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 (11)
- 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–)2012All engines except: B6324S5
- Volvo XC90 (2003–)2013–2014Engine B5254T9 only
What does this fault code mean?
The brake control module registers that the voltage supply to the AYC sensor is too high or too low. The fault may be due to poor contact, wires that are shorted or broken, an internal fault in the AYC sensor or in the brake control module.
Possible causes
- Contact resistance or oxidation in the connectors or connections
- AYC sensor supply wires shorted to ground or supply voltage
- Open circuit in the AYC sensor supply wire
- 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
- 2Check the supply wire to the AYC sensor for breaks and short circuits
- 3Check the supply voltage with diagnostic equipment and replace the AYC sensor if it is faulty
- 4The brake system is safety critical: do not replace the brake control module for this code, and drive carefully until the fault is fixed
Symptoms you may notice5
- Anti-spin warning lamp on
- General yellow warning lamp on
- Anti-spin does not work
- Stability function does not work
- Anti-skid 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.