VOLVO
ECM-P055700 - Brake Booster Pressure Sensor Circuit Low. General Failure Information. No sub type information
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:
11 modelsC30 (2007–2013), S40 (2004–2013), S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–)
Show models by year and engine (29)
- Volvo C30 (2007–2013)2011–2013Engine D4162T only
- Volvo S40 (2004–2013)2011–2012Engine D4162T only
- Volvo S60 (2011–)2011All engines except: B5254T5, B6304T4, D5204T2, D5244T10
- Volvo S60 (2011–)2012Engine B4164T, B4164T2, B4164T3, D4162T only
- Volvo S60 (2011–)2013All engines except: B4204T7, B6304T4, D5204T3, D5204T7, D5244T11, D5244T15
- Volvo S60 (2011–)2014–2015Engine B4164T, B4164T2, B4164T3, B5204T8, B5204T9, B5254T12, B5254T14, D4162T only
- Volvo S80 (2007–)2010Engine B4204T6 only
- Volvo S80 (2007–)2011Engine B4164T, B4204T6, B4204T7 only
- Volvo S80 (2007–)2012Engine B4164T, B4164T2, D4162T only
- Volvo S80 (2007–)2013–2014Engine B4164T, B4164T2, B5254T12, B5254T14, D4162T only
- Volvo S80 (2007–)2015Engine B4164T, D4162T only
- Volvo V40 (2013–)2013–2014All engines except: D5204T4, D5204T6
- Volvo V40 (2013–)2015All engines except: B4204T11, D4204T14, D5204T6
- Volvo V40 Cross Country (2013–)2013–2014All engines except: D5204T4, D5204T6
- Volvo V40 Cross Country (2013–)2015All engines except: B4204T11, D4204T14, D5204T6
- Volvo V50 (2004–2013)2011–2012Engine D4162T only
- Volvo V60 (2011–)2011All engines except: B6304T4, D5204T2, D5244T10
- Volvo V60 (2011–)2012Engine B4164T, B4164T2, B4164T3, D4162T only
- Volvo V60 (2011–)2013Engine B4164T, B4164T2, B4164T3, B5204T8, B5204T9, D4162T only
- Volvo V60 (2011–)2014Engine B4164T, B4164T2, B4164T3, B5204T8, B5204T9, B5254T12, D4162T only
- Volvo V60 (2011–)2015Engine B4164T, B4164T2, B4164T3, B5204T9, B5254T12, D4162T only
- Volvo V60 Cross Country (2015–)2015
- Volvo V70 (2008–)2010Engine B4204T6 only
- Volvo V70 (2008–)2011Engine B4164T, B4204T6, B4204T7 only
- Volvo V70 (2008–)2012Engine B4164T, B4164T2, D4162T only
- Volvo V70 (2008–)2013–2015Engine B4164T, B4164T2, B5204T9, D4162T only
- Volvo XC60 (2009–)2010Engine B4204T6 only
- Volvo XC60 (2009–)2011Engine B4204T6, B4204T7 only
- Volvo XC60 (2009–)2015Engine B5204T9, B5254T12, B5254T14 only
What does this fault code mean?
The ECM monitors the vacuum pressure sensor, which measures the negative pressure in the brake booster, and reads the voltage from its analogue signal. The code is set when the signal wire between the sensor and the ECM is shorted to ground or has a break. The fault may also be poor contact in the connector, or a damaged sensor or module.
Possible causes
- Loose connection or oxidation in the connector
- Signal wire shorted to ground
- Break in the signal wire
- Damaged vacuum pressure sensor
- Damaged engine control module (ECM)
What you can do
- 1Check that the vacuum pressure sensor connector is secure and not oxidized
- 2Use a multimeter to check that the signal wire from the vacuum pressure sensor has no break and is not shorted to ground
- 3If you have a diagnostic tool, read the vacuum pressure in live data with the engine running and see whether the value is steady
- 4Clear the code and start the engine to see whether it returns
- 5Do not work on the brake booster yourself; if the fault returns, have a workshop check the vacuum pressure sensor and the engine control module with diagnostic equipment
Symptoms you may notice4
- An unusual noise is heard at idle
- An unusual noise is heard while driving
- Warning symbol and message in the display
- Automatic engine start/stop does not work, both while driving and at idle
What the fault can affect3
- The brake vacuum pump runs all the time
- The module uses a vacuum value that corresponds to no vacuum
- Automatic engine start/stop is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.