VOLVO
ECM-2121 - Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance
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:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (5)
- Volvo C30 (2007–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo C70 (2006–2013)2008Engine D4204T only
- Volvo C70 (2006–2013)2009–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo S40 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo V50 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
What does this fault code mean?
The engine control module checks the pedal sensor's signal and stores the code when the value is too low, that is outside its permitted range. If the car shows none of the symptoms at the moment, the fault may be intermittent.
Possible causes
- Contact resistance or oxidation in the connectors
- Signal cable short-circuited to ground
- Damaged accelerator pedal position sensor
What you can do
- 1Check that the relevant fuses are intact; their locations are given in the owner's manual
- 2Test the relevant functions of the car on a test drive to see whether the symptoms return
- 3Check the connectors at the accelerator pedal and where the cable joins the control module for oxidation and contact resistance
- 4Have a diagnostic tool? Read the accelerator pedal value in live data while you press the pedal slowly from one end stop to the other, and check that the value changes smoothly
- 5Use a multimeter to check that the signal cable from the accelerator pedal position sensor is not in contact with ground
- 6If the connectors and cable are sound but the fault remains, have a workshop replace the accelerator pedal position sensor
Symptoms you may notice2
- Text message and warning symbol in the display
- The car feels weak and lacks power
What the fault can affect1
- Engine torque may be limited
General guidance for car owners. Diagnosis on the car can point to a different cause.