VOLVO
ECM-1703 - Brake pedal sensor Faulty signal
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 (9)
- Volvo C30 (2007–2013)2008–2009Engine 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)2008–2009Engine 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)2008–2009Engine 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 runs a self-test when the ignition is switched on and when the engine starts, and during it checks the brake pedal sensor. If the sensor is seen as active during the test, or gives faulty signals at engine start, fault code ECM-1703 is set.
Possible causes
- Driver error: brake pedal pressed during the ECM self-test
- Damaged brake pedal sensor
What you can do
- 1Do not press the brake pedal when the ignition is switched on or when the engine starts. Then clear the fault code
- 2If you have a diagnostic tool: check in live data that the brake pedal sensor goes from off to on when the pedal is pressed, and back when it is released
- 3Switch off the ignition and check the brake pedal sensor connector for play, contact resistance and oxidation
- 4Braking is safety-critical: if the pedal feels odd, do not drive the car until a workshop has checked it
- 5If the code returns although the pedal is not pressed at start-up, have a workshop replace the brake pedal sensor
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.