VOLVO
ECM-0406 - Position sensor (exhaust gas recirculation (EGR)). Signal too high
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (10)
- Volvo C30 (2007–2013)2007Engine D4204T only
- 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)2004–2006Engine D4204T, D4204T2 only
- Volvo S40 (2004–2013)2007Engine D4204T only
- Volvo S40 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo V50 (2004–2013)2004–2006Engine D4204T, D4204T2 only
- Volvo V50 (2004–2013)2007Engine D4204T only
- Volvo V50 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
What does this fault code mean?
The control module monitors the EGR valve function and sets the fault if the signal from the position sensor is too high. The causes may be poor contact in the connections, an open circuit in the supply or signal wire, a signal wire shorted to voltage, or a damaged EGR valve.
Possible causes
- Contact resistance, oxidation or poor contact in the connections
- Open circuit in the supply or signal wire
- Signal wire short-circuited to voltage
- Damaged EGR valve
What you can do
- 1Switch off the ignition and check the connections to the EGR valve for poor contact, contact resistance and oxidation
- 2Look for chafing on the signal wire near the EGR valve, and use a multimeter to check that it is not shorted to voltage
- 3Also use a multimeter to check that the supply to the position sensor has no open circuit
- 4If you have a diagnostic tool, read the EGR position sensor value in live data at idle and see whether it stays consistently high
- 5If the fault remains, have a workshop with diagnostic equipment check the EGR valve
Symptoms you may notice1
- The check engine lamp lights or behaves abnormally
General guidance for car owners. Diagnosis on the car can point to a different cause.