VOLVO
ECM-C100 - Communication between control modules. Signal missing
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (6)
- Volvo C30 (2007–2013)2007–2010Engine D4204T only
- Volvo C70 (2006–2013)2008–2010Engine D4204T only
- Volvo S40 (2004–2013)2004–2006Engine D4204T, D4204T2 only
- Volvo S40 (2004–2013)2007–2010Engine D4204T only
- Volvo V50 (2004–2013)2004–2006Engine D4204T, D4204T2 only
- Volvo V50 (2004–2013)2007–2010Engine D4204T only
What does this fault code mean?
The code says that the signal between control modules is missing. The engine control module has registered a serious disturbance on the high speed side of the CAN network, so communication is blocked and the module cannot be reached.
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 engine control module
- Internal fault in some other control module on the same section of the CAN network
What you can do
- 1Start by reading the fault codes from the CEM and the other control modules. There is no specific fault-tracing procedure for this code
- 2Check that the fuses are intact and that the battery is connected
- 3Check the connectors in the CAN network at the engine control module and the CEM for corrosion and loose contacts
- 4Look for breaks and chafing on the CAN wires, especially where they bend or are pinched
- 5Erase the fault codes only after the other faults are fixed, then road test the car to see whether the fault returns
- 6If the fault remains, have a workshop check the CAN network with diagnostic equipment
Symptoms you may notice2
- A warning message or warning symbol appears in the display
- The Check engine warning lamp lights up or behaves abnormally
General guidance for car owners. Diagnosis on the car can point to a different cause.