VOLVO
BCM-0121 - Yaw rate sensor. Signal outside its permitted range
System
Brake Control Module (BCM)
Volvo models this fault code applies to
Applies to the following models:
10 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), S60 (2001–2009), S80 (1999–2006), V50 (2004–2013), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (21)
- Volvo C30 (2007–2013)2007–2011
- Volvo C30 (2007–2013)2012All engines except: D4162T, D5204T, D5204T5
- Volvo C30 (2007–2013)2013Engine B4204S3, B4204S4, B5254T7 only
- Volvo C30 Electric (2011–2013)2011–2013
- Volvo C70 (2006–2013)2006–2011
- Volvo C70 (2006–2013)2012–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2004–2010
- Volvo S40 (2004–2013)2011–2012All engines except: D4162T, D5204T, D5204T5
- Volvo S60 (2001–2009)2002–2009
- Volvo S80 (1999–2006)2002–2006
- Volvo V50 (2004–2013)2004–2010
- Volvo V50 (2004–2013)2011–2012All engines except: D4162T, D5204T, D5204T5
- 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 AYC sensor contains the yaw rate sensor, the lateral acceleration sensor, the accelerometer and the lean sensor, and is connected to the brake control module on its own CAN wire. If the signal from the yaw rate sensor is implausible, the code is set. The fault may come from interference, low supply voltage or an internal fault in the sensor.
Possible causes
- Interference or noise on the wires that has disturbed the AYC sensor's calculations
- Supply voltage to the AYC sensor too low
- Incorrect wheel alignment
- Internal fault in the AYC sensor
- Interference on the wires that has disturbed the stability sensor's (BSC) calculations
What you can do
- 1Check the connectors at the brake control module and the AYC sensor for contact resistance and oxidation
- 2Make sure no source of interference, for example a mobile phone or radio receiver, sits too close to the AYC sensor
- 3If the code status is intermittent, poor contact or an interference source has probably been the cause; if the fault remains, have a workshop check the sensor
- 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
- 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 affect2
- Traction control (TC), stability control (SC) and active yaw control (AYC) are disabled
- Roll stability control (RSC) is disabled on cars that have it
General guidance for car owners. Diagnosis on the car can point to a different cause.