VOLVO
BCM-U300308 - Battery Voltage. General Failure Information. Bus Signal / Message Failures
System
Brake Control Module (BCM)
Volvo models this fault code applies to
Applies to the following models:
6 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013)
Show models by year and engine (7)
- Volvo C30 (2007–2013)2011–2013Engine D4162T, D5204T, D5204T5 only
- Volvo C70 (2006–2013)2011Engine D5204T, D5204T5 only
- Volvo C70 (2006–2013)2012–2013All engines except: B5254T7
- Volvo S40 (2004–2013)2011–2012Engine D4162T, D5204T, D5204T5 only
- Volvo V40 (2013–)2013–2015
- Volvo V40 Cross Country (2013–)2013–2015
- Volvo V50 (2004–2013)2011–2012Engine D4162T, D5204T, D5204T5 only
What does this fault code mean?
Although the code is named battery voltage, it concerns the steering angle sensor signal. The brake control module (BCM) has received a steering angle signal over the data network (CAN) that is outside the plausible range, which points to a problem with the steering angle sensor or communication with it. This can affect the stability functions.
Possible causes
- Break in the CAN bus
- Fault in the steering angle sensor module (SAS)
What you can do
- 1Read codes in the steering angle sensor module and troubleshoot them first
- 2Check the CAN wiring for breaks and contact resistance
- 3Do not replace the brake control module for this code, as the fault lies in another module
- 4The brake and stability systems are safety-critical, so have a workshop carry out any work on the wiring and the modules
Symptoms you may notice1
- No clear symptoms for the driver
What the fault can affect3
- Stability control is disabled
- Traction control is disabled
- Dynamic stability control (AYC) is disabled
General guidance for car owners. Diagnosis on the car can point to a different cause.