VOLVO
ECM-2126 - Accelerator pedal (AP) position sensor, circuit 2.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 (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 engine control module checks the pulse length of the PWM signal from accelerator pedal circuit 2 and stores the code when it is incorrect. A damaged accelerator pedal position sensor can cause the fault, and the code may also be stored incorrectly after a control module in the car has been reprogrammed.
Possible causes
- Damaged accelerator pedal position sensor
What you can do
- 1Check the wiring and connectors at the accelerator pedal for chafing, play and corrosion
- 2Have a diagnostic tool? Follow the pedal movement in live data while you press and release the pedal slowly, and check that the circuit 2 signal follows the movement
- 3If a control module in the car has recently been reprogrammed, the code may have been stored incorrectly, so clear it and road test before replacing any part
- 4If the fault returns, have a workshop replace the accelerator pedal position sensor
Symptoms you may notice1
- The engine responds poorly when you press the accelerator
General guidance for car owners. Diagnosis on the car can point to a different cause.