VOLVO
ECM-0556 - Brake booster pressure sensor circuit range/position
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 monitors the pressure in the brake servo. The fault is set when the pressure falls outside its limit value while the engine runs. The causes may be a damaged vacuum system between the non-return valve and the brake servo, or a damaged engine control module.
Possible causes
- Damaged vacuum system between the non-return valve and the brake servo
- Damaged engine control module
What you can do
- 1Save the fault codes and their values before erasing anything, since erasing removes all fault codes in the engine control module
- 2Start the engine, let it idle for a while, then switch it off and switch the ignition on again
- 3Check the hoses and connections to the brake servo for cracks and leaks
- 4Check the vacuum sensor connector for looseness, contact resistance and oxidation
- 5Because the brake servo is part of the brake system, have a workshop check the vacuum system if a leak is found or the fault remains
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.