VOLVO
ECM-U002165 - Brake Pedal Switch Circuit. Bus Signal / Message Failures. Alive / sequence counter incorrect / not updated
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
3 modelsS60 (2011–), S80 (2007–), V70 (2008–)
Show models by year and engine (9)
- Volvo S60 (2011–)2011–2012Engine B5254T5 only
- Volvo S80 (2007–)2007–2008Engine B5254T6 only
- Volvo S80 (2007–)2009Engine B5254T6, B5254T8 only
- Volvo S80 (2007–)2010–2011Engine B5254T10, B5254T11, B5254T8 only
- Volvo S80 (2007–)2012Engine B5254T10 only
- Volvo V70 (2008–)2008Engine B5254T6 only
- Volvo V70 (2008–)2009Engine B5254T6, B5254T8 only
- Volvo V70 (2008–)2010–2011Engine B5254T10, B5254T11 only
- Volvo V70 (2008–)2012Engine B5254T10 only
What does this fault code mean?
The engine control module (ECM) receives information about the brake pedal status from the brake control module (BCM) all the time, including the cruise control off switch. The code is set when the signal from the off switch keeps the same data for too long, and it is then judged to be incorrect.
Possible causes
- Open circuit in the communication cable
- Communication cable shorted to ground
- Communication cable shorted to voltage
- Contact resistance or oxidation in the connections
- Open circuit in the connections
- Short circuit in the connections
What you can do
- 1Read the code with a diagnostic tool and check whether it is active or only stored
- 2The brake system is safety critical, so have a workshop check the brake control module and the brake pedal function if the fault remains
- 3Check the connectors to the engine control module and the brake control module for contact resistance, looseness and oxidation
- 4Use a multimeter to check that the communication cable has no break and no contact with ground or voltage
- 5If you have a diagnostic tool: read the off switch status in live data while you press the brake pedal, and see that the value changes
- 6If the battery has been disconnected or the engine control module has been reprogrammed, press the brake pedal twice to activate the cruise control again
Symptoms you may notice1
- Cruise control does not engage
What the fault can affect1
- Cruise control is disengaged for as long as the fault is active
General guidance for car owners. Diagnosis on the car can point to a different cause.