VOLVO
ECM-U007500 - Control Module Communication Bus "C" Off. General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
8 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (8)
- Volvo S60 (2011–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9, D4204T5 only
- Volvo S80 (2007–)2014–2015Engine B4204T11, B4204T12, B4204T15, D4204T5 only
- Volvo V40 (2013–)2015Engine B4204T11, D4204T14 only
- Volvo V40 Cross Country (2013–)2015Engine B4204T11, D4204T14 only
- Volvo V60 (2011–)2014–2015Engine B4204T11, B4204T12, B4204T15, B4204T9, D4204T5 only
- Volvo V70 (2008–)2014–2015Engine B4204T11, D4204T5 only
- Volvo XC60 (2009–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9, D4204T5 only
- Volvo XC70 (2008–)2014–2015Engine B4204T11, D4204T5 only
What does this fault code mean?
The engine control module (ECM) is disconnected from CAN network C when it detects that communication is blocked by a serious disturbance, which is called bus-off.
Possible causes
- Contact resistance or oxidation in the connections
- Open circuit in one of the CAN wires
- Short circuit between the CAN wires
- Internal fault in the ECM
- Internal fault in another control module on the same part of the CAN network
What you can do
- 1Read the code with a diagnostic tool and check whether it is active or only stored
- 2Check the connectors to the engine control module and to the other control modules on CAN network C for contact resistance, looseness and oxidation
- 3Use a multimeter to check that the wires on CAN network C have no break and are not shorted to each other
- 4If you have a diagnostic tool: read the codes in the other control modules and note which ones also show communication faults
- 5Have a workshop check whether another control module on CAN network C is sending wrong messages
Symptoms you may notice5
- Check engine light comes on or behaves abnormally
- The engine lacks power, especially when pulling away from standstill
- The engine hesitates or jerks when driving at a steady speed
- Uneven idling
- Cruise control does not engage
What the fault can affect2
- The engine control module stops communicating on the CAN network and switches itself off
- The engine control module stays off until the voltage supply has been broken, and makes new attempts to communicate when the voltage is connected again
General guidance for car owners. Diagnosis on the car can point to a different cause.