VOLVO
ECM-P009721 - Intake Air Temperature Sensor 2 Circuit Low Input. 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?
This fault code concerns the intake air temperature sensor at the inlet. It is set when its signal is too low or too high. The cause can be an open circuit, a short circuit or poor contact in the signal wire, or a damaged sensor.
Possible causes
- Open circuit in the signal wire
- Signal wire shorted to voltage
- Damaged air temperature sensor at the inlet
- Loose connection, contact resistance or oxidation in the connections
- Signal wire shorted to ground
What you can do
- 1Check the connections at the inlet air temperature sensor for contact resistance, looseness and oxidation
- 2Use a multimeter to check that the signal wire has no open circuit or short to ground
- 3Use a multimeter to check that the signal wire has no voltage with the ignition off
- 4If you have a diagnostic tool: read the signal from the air temperature sensor in the intake pipe and check that the value is reasonable
- 5Have a workshop check the sensor if the wiring is in order
Symptoms you may notice1
- Check engine lamp (MIL) lights up
General guidance for car owners. Diagnosis on the car can point to a different cause.