VOLVO
ECM-1549 - Variable intake system. Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
3 modelsC30 (2007–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (13)
- Volvo C30 (2007–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo C30 (2007–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo C30 (2007–2013)2011–2013Engine B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2005Engine B4184S11 only
- Volvo S40 (2004–2013)2006Engine B4184S11, B4184S8 only
- Volvo S40 (2004–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo S40 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2005Engine B4184S11 only
- Volvo V50 (2004–2013)2006Engine B4184S11, B4184S8 only
- Volvo V50 (2004–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo V50 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
What does this fault code mean?
The engine control module (ECM) has detected a fault in the variable intake system, which is operated by a vacuum valve. The fault may lie in the wiring, in the vacuum valve or in the control module itself.
Possible causes
- Open circuit in the signal wire, or the signal wire is short-circuited to ground
- The signal wire is short-circuited to voltage
- Damaged vacuum valve
- Damaged engine control module (ECM)
What you can do
- 1Switch off the ignition and check the connectors in the system for play, contact resistance and oxidation
- 2With a multimeter, check that the signal wires have no break and are not shorted to ground or voltage
- 3If you have a diagnostic tool: activate the vacuum valve and check that it responds
- 4If the fault remains, have a workshop check the vacuum valve and the control module
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.