VOLVO
ECM-P040484 - Exhaust Gas Recirculation Control Circuit Range/Performance. Bus Signal / Message Failures. Signal below allowable range
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?
Although the code is named as a bus or message fault, it concerns the intake control during soot particle combustion. The ECM sets the code when it finds a fault in the intake control during soot burning, and the signal is below the permitted limit.
Possible causes
- Fault code ECM-P040485 may have the same cause and should be read at the same time
- Air leak in the intake system
- Contact resistance or oxidation in the connectors
- Sticking EGR valve
- Damaged throttle unit
What you can do
- 1Troubleshoot any other stored fault codes first, since this code can come from faults in other engine functions
- 2Check the EGR valve connector for play, contact resistance and oxidation
- 3Check that the intake system does not leak air, for example at hoses and connections
- 4Check the throttle unit connector for play, contact resistance and oxidation
- 5Check that the damper in the throttle unit moves freely and does not stick from dirt or soot
- 6If the fault remains, have a workshop check the throttle unit
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.