VOLVO
ECM-P050465 - Brake Switch A / B Correlation. Algorithm Based Failures. Signal has too few transitions / events
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:
14 modelsC30 (2007–2013), C70 (2006–2013), 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–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (47)
- Volvo C30 (2007–2013)2011–2013Engine D5204T, D5204T5 only
- Volvo C70 (2006–2013)2011Engine D5204T, D5204T5 only
- Volvo C70 (2006–2013)2012–2013All engines except: B5254T7
- Volvo S40 (2004–2013)2011–2012Engine D5204T, D5204T5 only
- Volvo S60 (2011–)2011Engine B6304T4, D5204T2, D5244T10 only
- Volvo S60 (2011–)2012Engine B6304T4, D5204T3, D5244T11, D5244T15 only
- Volvo S60 (2011–)2013All engines except: B4164T, B4164T2, B4164T3, B4204T7, D4162T
- Volvo S60 (2011–)2014All engines except: B4164T, B4164T2, B4164T3, B4204T7, D4162T, D4204T5
- Volvo S60 (2011–)2015All engines except: B4164T, B4164T2, B4164T3, D4162T, D4204T5
- Volvo S80 (2007–)2007Engine B6324S, B8444S only
- Volvo S80 (2007–)2008Engine B6304T2, B6324S, B8444S only
- Volvo S80 (2007–)2009Engine B6304T2, B6324S, B8444S, D5244T10 only
- Volvo S80 (2007–)2010Engine B6304T2, B6324S, B6324S2, B8444S, D5244T10, D5244T14, D5244T19 only
- Volvo S80 (2007–)2011Engine B6304T4, B6324S4, B6324S5, B8444S, D5204T2, D5244T10 only
- Volvo S80 (2007–)2012Engine B6304T4, B6324S4, B6324S5, D5204T3, D5244T11, D5244T15 only
- Volvo S80 (2007–)2013All engines except: B4164T, B4164T2, B4204T6, B4204T7, D4162T
- Volvo S80 (2007–)2014All engines except: B4164T, B4164T2, B4204T6, B4204T7, D4162T, D4204T5
- Volvo S80 (2007–)2015All engines except: B4164T, D4162T, D4204T5
- Volvo V40 (2013–)2013–2014Engine B5204T8, B5204T9, B5254T12, B5254T14 only
- Volvo V40 (2013–)2015Engine B5204T8, B5204T9 only
- Volvo V40 Cross Country (2013–)2013–2015Engine B5204T8, B5204T9, B5254T12, B5254T14 only
- Volvo V50 (2004–2013)2011–2012Engine D5204T, D5204T5 only
- Volvo V60 (2011–)2011Engine B6304T4, D5204T2, D5244T10 only
- Volvo V60 (2011–)2012Engine B6304T4, D5204T3, D5244T11, D5244T15 only
- Volvo V60 (2011–)2013All engines except: B4164T, B4164T2, B4164T3, B4204T7, D4162T
- Volvo V60 (2011–)2014All engines except: B4164T, B4164T2, B4164T3, B4204T7, D4162T, D4204T5
- Volvo V60 (2011–)2015All engines except: B4164T, B4164T2, B4164T3, D4162T, D4204T5
- Volvo V60 Cross Country (2015–)2015
- Volvo V70 (2008–)2008Engine B6304T2, B6324S only
- Volvo V70 (2008–)2009Engine B6304T2, B6324S, D5244T10 only
- Volvo V70 (2008–)2010Engine B6304T2, B6324S, B6324S2, D5244T10, D5244T14, D5244T19 only
- Volvo V70 (2008–)2011Engine B6304T4, B6324S5, D5204T2, D5244T10 only
- Volvo V70 (2008–)2012Engine B6304T4, B6324S5, D5204T3, D5244T11, D5244T15 only
- Volvo V70 (2008–)2013All engines except: B4164T, B4164T2, B4204T7, D4162T
- Volvo V70 (2008–)2014All engines except: B4164T, B4164T2, B4204T7, D4162T, D4204T5
- Volvo V70 (2008–)2015All engines except: B4164T, B4164T2, D4162T, D4204T5
- Volvo XC60 (2009–)2009Engine B6304T2 only
- Volvo XC60 (2009–)2010All engines except: B4204T6
- Volvo XC60 (2009–)2011–2012All engines except: B4204T6, B4204T7
- Volvo XC60 (2009–)2013All engines except: B4204T7
- Volvo XC60 (2009–)2014–2015All engines except: B4204T7, D4204T5
- Volvo XC70 (2008–)2008Engine B6324S only
- Volvo XC70 (2008–)2009Engine B6304T2, B6324S only
- Volvo XC70 (2008–)2010–2013
- Volvo XC70 (2008–)2014–2015All engines except: D4204T5
- Volvo XC90 (2003–)2007–2010Engine B6324S only
- Volvo XC90 (2003–)2011–2014Engine B6324S5 only
What does this fault code mean?
The ECM compares the brake light switch signal with the brake pedal switch position, which the brake control module (BCM) sends over the CAN network. The code is set when the signals show the same position for an unreasonably long time.
Possible causes
- Diagnose the cause in the brake control module (BCM)
- Poor contact or oxidation in the connections of both switches
- The signal wire has a break or is shorted to ground
- Damaged brake light switch or brake pedal switch
- Brake light switch incorrectly fitted
- Damaged brake position sensor
What you can do
- 1Read the codes in the brake control module (BCM) first and repair them, as this code cannot be cleared until they have been repaired
- 2Check that the brake light switch is correctly fitted and that the fuses are intact
- 3Check the connections to both switches for oxidation, loose contacts and chafed wiring
- 4If you have a diagnostic tool, read the brake pedal positions in live data and see whether they change when the pedal is pressed and released several times
- 5After the repair, press and release the brake pedal several times and check that the code does not come back
- 6Do not work on the braking system yourself; have a workshop carry out the checks that need diagnostic equipment
Symptoms you may notice5
- Cruise control does not work at all
- Warning symbol and message in the display
- Cruise control does not hold the set speed and disengages
- Automatic engine start/stop does not work, both while driving and at idle
- The engine does not start, either sometimes or always
What the fault can affect3
- Autostart is blocked
- Cruise control is switched off while the fault is active
- If the fault is present all the time for a long period, vehicle performance can be limited
General guidance for car owners. Diagnosis on the car can point to a different cause.