VOLVO
ECM-P050464 - Brake Switch A / B Correlation. Algorithm Based Failures. Signal plausibility failure
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–)
Show models by year and engine (20)
- Volvo S60 (2011–)2011Engine B4164T, B4164T3, B4204T6, B4204T7 only
- Volvo S60 (2011–)2012–2014Engine B4164T, B4164T2, B4164T3, B4204T7 only
- Volvo S60 (2011–)2015Engine B4164T, B4164T2, B4164T3 only
- Volvo S80 (2007–)2010Engine B4204T6 only
- Volvo S80 (2007–)2011Engine B4164T, B4204T6, B4204T7 only
- Volvo S80 (2007–)2012–2014Engine B4164T, B4164T2, B4204T6, B4204T7 only
- Volvo S80 (2007–)2015Engine B4164T only
- Volvo V40 (2013–)2013Engine B4164T, B4164T3 only
- Volvo V40 (2013–)2014–2015Engine B4164T, B4164T3, B4164T4 only
- Volvo V40 Cross Country (2013–)2013–2015Engine B4164T only
- Volvo V60 (2011–)2011Engine B4164T, B4164T3, B4204T6, B4204T7 only
- Volvo V60 (2011–)2012–2014Engine B4164T, B4164T2, B4164T3, B4204T7 only
- Volvo V60 (2011–)2015Engine B4164T, B4164T2, B4164T3 only
- Volvo V70 (2008–)2010Engine B4204T6 only
- Volvo V70 (2008–)2011Engine B4164T, B4204T6, B4204T7 only
- Volvo V70 (2008–)2012–2014Engine B4164T, B4164T2, B4204T7 only
- Volvo V70 (2008–)2015Engine B4164T, B4164T2 only
- Volvo XC60 (2009–)2010Engine B4204T6 only
- Volvo XC60 (2009–)2011–2012Engine B4204T6, B4204T7 only
- Volvo XC60 (2009–)2013–2015Engine B4204T7 only
What does this fault code mean?
The ECM verifies that the readings from the pedal sensor and the light switch are reliable. The code is set when the two signals differ repeatedly. The central electronic module (CEM) is also connected to the brake light switch and may be the cause.
Possible causes
- Diagnose the cause in the central electronic module (CEM)
- The wire to the brake light switch has a break or is shorted to ground or supply voltage
- The wire to the brake pedal position sensor has a break or is shorted to ground or supply voltage
- Contact resistance, oxidation or intermittent contact in the connector
- The wire to the brake pedal switch has a break or is shorted to ground or supply voltage
What you can do
- 1Read the codes in the brake control module (BCM) and the central electronic module (CEM) and repair them first
- 2Check that the brake light switch is fitted correctly and that the brake pedal position sensor sits properly
- 3Check the connections to the brake light switch and brake pedal position sensor for oxidation, breaks or a short to ground
- 4Check that the fuses are intact
- 5If you have a diagnostic tool, follow the brake pedal positions in live data and check that they agree when the pedal is pressed and released
- 6Do not work on the braking system yourself; if the fault returns, have a workshop check the components with diagnostic equipment
Symptoms you may notice3
- Red warning symbol and message in the display
- Cruise control does not engage
- Warning symbol and message in the display
What the fault can affect1
- Cruise control is switched off while the fault is active
General guidance for car owners. Diagnosis on the car can point to a different cause.