VOLVO
ECM-0703 - Brake pedal sensor. Signal too high
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
3 modelsC30 (2007–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (13)
- Volvo C30 (2007–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo C30 (2007–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo C30 (2007–2013)2011–2013Engine B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2005Engine B4184S11 only
- Volvo S40 (2004–2013)2006Engine B4184S11, B4184S8 only
- Volvo S40 (2004–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo S40 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2005Engine B4184S11 only
- Volvo V50 (2004–2013)2006Engine B4184S11, B4184S8 only
- Volvo V50 (2004–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo V50 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
What does this fault code mean?
The ECM compares the brake pedal sensor's activation with the brake light signal. If the brake light signal is disturbed, or the brake pedal sensor is activated without a matching brake light signal, the code is set. The code therefore concerns the signals from the brake pedal and the brake lights.
Possible causes
- Open circuit in the signal wire from the brake light switch
- Damaged brake light switch
- Damaged brake pedal sensor
What you can do
- 1Check that the brake lights come on when the pedal is pressed and go off when it is released
- 2With the ignition off, check the connectors at the brake light switch and the brake pedal sensor for looseness, contact resistance and oxidation
- 3Use a multimeter to check the signal wire from the brake light switch for an open circuit and for a short to earth
- 4Braking is safety-critical; if the fault remains, have a workshop replace the brake pedal sensor or the brake light switch
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.