VOLVO
ECM-P011221 - Intake Air Temperature Sensor 1 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?
The control module keeps checking the reading from the temperature sensor built into the mass air flow sensor while the engine runs. If the signal is too low, the fault code is set.
Possible causes
- Damaged air temperature sensor inside the mass air flow sensor
- Contact resistance or oxidation in the connector
What you can do
- 1Read the fault code status with the ignition on and check that the fault is not active when the test is finished. Clear the code and road test the vehicle
- 2Check that the connector to the mass air flow sensor is firmly seated and free from oxidation and contact resistance
- 3With the ignition on, use a multimeter to check that the connector receives supply voltage. It should match the battery voltage
- 4If the connector and wiring are in order and the fault remains, have a workshop check or replace the mass air flow sensor
Symptoms you may notice1
- The engine has poor performance and lacks power
What the fault can affect2
- Engine torque may be limited
- The control module uses a calculated value for the air temperature
General guidance for car owners. Diagnosis on the car can point to a different cause.