VOLVO
ECM-P040800 - Exhaust Gas Recirculation Sensor "B" Circuit High. General Failure Information. No sub type information
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:
8 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (8)
- Volvo S60 (2011–)2014–2015Engine D4204T5 only
- Volvo S80 (2007–)2014–2015Engine D4204T5 only
- Volvo V40 (2013–)2015Engine D4204T14 only
- Volvo V40 Cross Country (2013–)2015Engine D4204T14 only
- Volvo V60 (2011–)2014–2015Engine D4204T5 only
- Volvo V70 (2008–)2014–2015Engine D4204T5 only
- Volvo XC60 (2009–)2014–2015Engine D4204T5 only
- Volvo XC70 (2008–)2014–2015Engine D4204T5 only
What does this fault code mean?
The ECM learns the end positions of the EGR valve. The fault is set when the signal from that learning is faulty or the learning fails, and the code is named for a high signal.
Possible causes
- Signal cable shorted to supply voltage
- Damaged EGR valve
What you can do
- 1Start by reading any fault codes for the turbo system and the mass air flow sensor, and deal with those first if present
- 2Use a multimeter to check whether the signal cable to the EGR valve has voltage with the ignition off
- 3Check that the connectors at the EGR valve are firmly seated and not oxidised
- 4If the fault remains, have a workshop check the EGR valve, and carry out an adaption if it has been 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.