VOLVO
ECM-U012100 - Lost Communication With Brake Control Module. General Failure Information. No sub type information
System
Engine Control Module (ECM)
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:
10 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (42)
- Volvo S60 (2011–)2011–2012Engine B5254T5, B6304T4 only
- Volvo S60 (2011–)2013Engine B5204T8, B5204T9, B5254T12, B5254T14, B6304T4 only
- Volvo S60 (2011–)2014All engines except: B4164T, B4164T2, B4164T3, B4204T7, D4162T, D5204T3, D5204T7, D5244T11, D5244T15
- Volvo S60 (2011–)2015All engines except: B4164T, B4164T2, B4164T3, D4162T, D5204T3, D5204T7, D5244T11, D5244T15, D5244T23
- Volvo S80 (2007–)2007
- Volvo S80 (2007–)2008All engines except: B4204S3, B4204S4
- Volvo S80 (2007–)2009All engines except: B4204S3, B4204S4, D5244T10
- Volvo S80 (2007–)2010All engines except: B4204S3, B4204S4, B4204T6, D5244T10, D5244T14, D5244T19
- Volvo S80 (2007–)2011All engines except: B4164T, B4204S3, B4204S4, B4204T6, B4204T7, D5204T2, D5244T10
- Volvo S80 (2007–)2012Engine B5254T10, B6304T4, B6324S4, B6324S5 only
- Volvo S80 (2007–)2013Engine B5254T12, B5254T14, B6304T4, B6324S4, B6324S5 only
- Volvo S80 (2007–)2014Engine B4204T11, B4204T12, B4204T15, B5254T12, B5254T14, B6304T4, B6324S4, B6324S5, D4204T5 only
- Volvo S80 (2007–)2015All engines except: B4164T, D4162T, D5204T3, D5244T15
- Volvo V40 (2013–)2013–2014Engine B5204T8, B5204T9, B5254T12, B5254T14 only
- Volvo V40 (2013–)2015Engine B4204T11, B5204T8, B5204T9, D4204T14 only
- Volvo V40 Cross Country (2013–)2013–2014Engine B5204T8, B5204T9, B5254T12, B5254T14 only
- Volvo V40 Cross Country (2013–)2015All engines except: B4164T, D4162T, D5204T6
- Volvo V60 (2011–)2011–2012Engine B6304T4 only
- Volvo V60 (2011–)2013Engine B5204T8, B5204T9, B6304T4 only
- Volvo V60 (2011–)2014Engine B4204T11, B4204T12, B4204T15, B4204T9, B5204T8, B5204T9, B5254T12, B6304T4, D4204T5 only
- Volvo V60 (2011–)2015Engine B4204T11, B4204T12, B4204T15, B4204T9, B5204T9, B5254T12, B6304T3, B6304T4, B6304T5, D4204T5 only
- Volvo V60 Cross Country (2015–)2015
- Volvo V70 (2008–)2008All engines except: B4204S3, B4204S4
- Volvo V70 (2008–)2009All engines except: B4204S3, B4204S4, D5244T10
- Volvo V70 (2008–)2010All engines except: B4204S3, B4204S4, B4204T6, D5244T10, D5244T14, D5244T19
- Volvo V70 (2008–)2011Engine B5254T10, B5254T11, B6304T4, B6324S5, D4164T only
- Volvo V70 (2008–)2012Engine B5254T10, B6304T4, B6324S5 only
- Volvo V70 (2008–)2013Engine B5204T9, B6304T4, B6324S5 only
- Volvo V70 (2008–)2014Engine B4204T11, B5204T9, B6304T4, B6324S5, D4204T5 only
- Volvo V70 (2008–)2015Engine B4204T11, B5204T9, B6304T4, D4204T5 only
- Volvo XC60 (2009–)2009
- Volvo XC60 (2009–)2010Engine B6304T2, B6324S, B6324S2 only
- Volvo XC60 (2009–)2011–2013Engine B6304T4, B6324S4, B6324S5 only
- Volvo XC60 (2009–)2014All engines except: B4204T7, D5204T3, D5204T7, D5244T11, D5244T12, D5244T15, D5244T17
- Volvo XC60 (2009–)2015All engines except: B4204T7, D5204T3, D5204T7, D5244T11, D5244T12, D5244T15, D5244T17, D5244T23
- Volvo XC70 (2008–)2008–2009
- Volvo XC70 (2008–)2010Engine B6304T2, B6324S, B6324S2 only
- Volvo XC70 (2008–)2011–2013Engine B6304T4, B6324S4, B6324S5 only
- Volvo XC70 (2008–)2014–2015Engine B4204T11, B6304T4, B6324S4, B6324S5, D4204T5 only
- Volvo XC90 (2003–)2007–2010Engine B6324S only
- Volvo XC90 (2003–)2011–2012Engine B6324S5 only
- Volvo XC90 (2003–)2013–2014All engines except: B5254T9
What does this fault code mean?
The engine control module (ECM) keeps taking in data from the brake control module (BCM) over the CAN network. The code is set when the engine control module detects a fault in CAN communication with the brake control module, or when an expected message from it is missing. Although the code is titled lost communication with the brake control module, it concerns communication between the engine control module and the brake control module.
Possible causes
- Break or short circuit on the CAN wires between the engine control module and the brake control module
- Contact resistance or oxidation in the connections on the CAN network
- One of the CAN wires is shorted to ground, to supply voltage or to another wire
- Internal fault in the engine control module
- Internal fault in another control module on the same part of the CAN network
- Fault in the brake control module (BCM)
What you can do
- 1Read the codes in the central electronics control module and other affected control modules, and fix them first. Then clear this code
- 2Check that the fuses are intact
- 3Check the CAN connectors at the engine control module and the brake control module for contact resistance and oxidation
- 4Look for chafed or pinched CAN wires. Use a multimeter to check that they have no break or short to ground, supply voltage or each other
- 5Clear the code and road test the car to see whether it is set again
- 6Do not work on the braking system yourself. If the fault returns: have a workshop with diagnostic equipment check the brake control module and the CAN network
Symptoms you may notice4
- Starter motor cranks but the engine will not start
- The anti-spin function does not work
- Message in the text display and a warning symbol
- Check engine warning light comes on or behaves abnormally
General guidance for car owners. Diagnosis on the car can point to a different cause.