VOLVO
BCM-C100064 - Hill Descent Control (HDC) Function. Algorithm Based Failures. Signal plausibility failure
System
Brake Control Module (BCM)
Volvo models this fault code applies to
Applies to the following models:
11 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), S60 (2011–), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013), V60 (2011–), V60 Cross Country (2015–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (14)
- 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 S60 (2011–)2011–2015
- Volvo V40 (2013–)2013–2015
- Volvo V40 Cross Country (2013–)2013–2015
- Volvo V50 (2004–2013)2011–2012Engine D4162T, D5204T, D5204T5 only
- Volvo V60 (2011–)2011–2012
- Volvo V60 (2011–)2013–2014All engines except: D82PHEV
- Volvo V60 (2011–)2015All engines except: D82PHEV, D87PHEV
- Volvo V60 Cross Country (2015–)2015
- Volvo XC60 (2009–)2009–2015
- Volvo XC70 (2008–)2008–2015
What does this fault code mean?
The hill descent control (HDC) uses gear information that the brake control module (BCM) receives over the car's data network. When the gear information calculated by the module does not match what has been sent over the network, the code is set and the function is blocked.
Possible causes
- Interference or temporary breaks on the CAN network
- Contact resistance or oxidation in connectors and joints
- Faulty reverse light switch
- Faulty first gear switch connector
- Fault in the central electronic module
What you can do
- 1Read the codes in the central electronic module and the engine management first, as the fault often starts there
- 2Check the reverse light switch and the first gear switch connector for contact resistance and oxidation
- 3Check that the reverse lights come on when reverse is selected and go off when you change gear
- 4Road test the car and check that the function works again when you drive in first gear and then reverse
- 5The braking system is safety critical: do not work on the brake control module or the data network yourself; leave this to a workshop
Symptoms you may notice1
- Hill descent assist does not work
What the fault can affect1
- Hill descent control (HDC) is blocked
General guidance for car owners. Diagnosis on the car can point to a different cause.