VOLVO
ECM-0221 - Electronic throttle unit, potentiometer 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 expects a certain voltage from potentiometer 2 in the throttle unit and logs a fault when the voltage falls outside the calibrated range. The cause is a damaged potentiometer in the throttle unit, and a workshop normally needs to check the throttle unit to fix the fault.
Possible causes
- Damaged potentiometer 2 in the throttle unit
What you can do
- 1Read the fault code, clear it and road test to see whether it returns
- 2Check that the connector at the throttle unit is fully engaged and free from oxidation
- 3If you have a diagnostic tool, check in live data whether the throttle position follows the accelerator pedal when it is pressed and released
- 4If the fault returns, have a workshop with diagnostic equipment check the throttle unit and decide whether it should be replaced
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.