VOLVO
BCM-0129 - Longitudinal accelerometer. Signal outside its permitted range.
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 longitudinal accelerometer sits in the AYC sensor and sends its value to the brake control module on its own CAN wire. It is only fitted to four-wheel-drive cars. The code is set when the signal from the sensor is implausible, and the fault may come from interference, low voltage, incorrect wheel alignment 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
What you can do
- 1Check the connectors at the brake control module and the AYC sensor for contact resistance and oxidation
- 2Make sure no interference source, such as 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
- 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 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.