VOLVO
ECM-C200 - Alternator. Signal missing
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:
4 modelsS60 (2001–2009), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (10)
- Volvo S60 (2001–2009)2006Engine D5244T4, D5244T5, D5244T6, D5244T7 only
- Volvo S60 (2001–2009)2007–2009Engine D5244T4, D5244T5, D5244T7 only
- Volvo V70 (2000–2008)2006Engine D5244T4, D5244T5, D5244T6, D5244T7 only
- Volvo V70 (2000–2008)2007Engine D5244T4, D5244T5, D5244T7 only
- Volvo V70 (2000–2008)2008Engine D5244T5, D5244T7 only
- Volvo V70 XC / XC70 (2001–2007)2006–2007Engine D5244T4 only
- Volvo XC90 (2003–)2006–2007Engine D5244T4 only
- Volvo XC90 (2003–)2008–2010Engine D5244T4, D5244T5 only
- Volvo XC90 (2003–)2011Engine D5244T18, D5244T4, D5244T5 only
- Volvo XC90 (2003–)2012All engines except: B5254T2, B6324S5
What does this fault code mean?
The engine control module communicates with the alternator control module (ACM) over the LIN bus. The fault code is set when the engine control module detects a fault in that communication. The alternator warning lamp can light with the engine running, and a message can appear in the display.
Possible causes
- Faulty signal
- Contact resistance or oxidation in the connectors
- Damaged alternator control module (ACM)
- Signal missing
- Open circuit on the signal cable
What you can do
- 1Inspect the ACM connector for contact resistance and oxidation
- 2Check that the alternator is bolted down firmly so that it has a good earth connection
- 3Disconnect the connector at the engine control module and check the signal cable for breaks, for a short to ground and for a short to supply voltage
- 4If you have a diagnostic tool: start the engine and read the alternator charging current in live data. The value should be steady while the engine runs
- 5If the alternator has been replaced, check that it is designed for LIN communication
- 6If the fault remains after these checks, have a workshop check the alternator control module
Symptoms you may notice2
- The Gen. not charging warning lamp lights with the engine running
- A message appears in the information display
General guidance for car owners. Diagnosis on the car can point to a different cause.