VOLVO
ECM-1112 - Intake air temperature (IAT) sensor inlet. Intermittent fault
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:
3 modelsC30 (2007–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (13)
- Volvo C30 (2007–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo C30 (2007–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo C30 (2007–2013)2011–2013Engine B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2005Engine B4184S11 only
- Volvo S40 (2004–2013)2006Engine B4184S11, B4184S8 only
- Volvo S40 (2004–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo S40 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2005Engine B4184S11 only
- Volvo V50 (2004–2013)2006Engine B4184S11, B4184S8 only
- Volvo V50 (2004–2013)2007–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo V50 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
What does this fault code mean?
During the same operating cycle the engine control module has repeatedly lost the signal from the intake air temperature sensor, more often than allowed. The fault is intermittent, meaning the signal has dropped out and then returned. It is checked while driving and usually goes unnoticed by the driver.
Possible causes
- Open circuit or short circuit to ground in the signal wire
- Short circuit to supply voltage in the signal wire
- Damaged intake air temperature sensor
What you can do
- 1Read and note the code, clear it and road test to see whether it returns
- 2Check that the intake air temperature sensor connector is secure and free from oxidation and contact resistance
- 3Use a multimeter to check the signal wire for an open circuit and a short circuit to ground
- 4Use a multimeter to check the signal wire for a short circuit to supply voltage
- 5If the fault remains with a clean connector and an intact wire, have a workshop check the sensor
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.