VOLVO
ECM-P055800 - Brake Booster Pressure Sensor Circuit High. 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 checks the vacuum pressure sensor that measures the vacuum in the brake booster. The fault is stored when the module sees that the signal from the sensor is too high, which here is because the signal wire is shorted to supply voltage. The module then works with a pressure equal to zero, which switches off the automatic engine start/stop function.
Possible causes
- Loose connection or oxidation in the connector to the vacuum pressure sensor
- The signal wire is shorted to supply voltage
- The vacuum pressure sensor is damaged
- The engine control module (ECM) is damaged
What you can do
- 1Check that the fuses are intact
- 2Check the connector at the vacuum pressure sensor for loose contact and oxidation, and look for chafed wiring
- 3Use a multimeter to check that the signal wire has no connection to supply voltage when the connector is unplugged
- 4If you have diagnostic equipment: read the vacuum pressure in live data and check that the value follows changes in brake booster vacuum
- 5If the connector and wiring are sound, have a workshop check the vacuum pressure sensor and control module. The fault affects the brake system, so have a workshop put it right soon
Symptoms you may notice5
- Unusual noise at idle
- Unusual noise while driving, hard to tell when it occurs
- Warning symbol and text message in the display
- Automatic engine start/stop does not work while driving
- Automatic engine start/stop does not work at idle
What the fault can affect2
- The brake vacuum pump runs all the time
- The automatic engine start/stop function is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.