VOLVO
ECM-P040421 - Exhaust Gas Recirculation Control Circuit Range/Performance. General Signal Failures. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (6)
- Volvo S80 (2007–)2007–2009Engine D5244T4, D5244T5 only
- Volvo V70 (2008–)2008–2009Engine D5244T4, D5244T5 only
- Volvo XC60 (2009–)2009All engines except: B6304T2
- Volvo XC70 (2008–)2008All engines except: B6324S
- Volvo XC70 (2008–)2009Engine D5244T4, D5244T5 only
- Volvo XC90 (2003–)2013–2014Engine D5244T18, D5244T5 only
What does this fault code mean?
The code states that the signal is too low, but the condition for setting it is that the flow through the EGR system is too high. The ECM monitors the EGR function and can show the fault while the engine runs.
Possible causes
- Sticking EGR valve
- Damaged EGR valve
What you can do
- 1Check that the EGR valve moves freely and is not sticking
- 2Clean the EGR valve of dirt and soot if it is clogged
- 3Inspect the O-ring and gasket on the EGR valve for damage
- 4If you have a diagnostic tool, activate the EGR valve and listen for a ticking sound
- 5Read and clear the fault code, then road test the car to see whether it comes back
- 6If the fault remains, have a workshop check the EGR valve
Symptoms you may notice2
- The engine performs worse than usual
- The idle is uneven
General guidance for car owners. Diagnosis on the car can point to a different cause.