VOLVO
ECM-133D - Intake air temperature (IAT) sensor inlet. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
9 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), S60 (2001–2009), S80 (1999–2006), V50 (2004–2013), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (20)
- Volvo C30 (2007–2013)2007Engine B5254T3 only
- Volvo C30 (2007–2013)2008–2013Engine B5254T7 only
- Volvo C70 (2006–2013)2006–2007Engine B5254T3 only
- Volvo C70 (2006–2013)2008–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2006–2007Engine B5254T3 only
- Volvo S40 (2004–2013)2008Engine B5254T3, B5254T7 only
- Volvo S40 (2004–2013)2009–2012Engine B5254T7 only
- Volvo S60 (2001–2009)2006Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo S60 (2001–2009)2007Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo S60 (2001–2009)2008–2009Engine B5204T5, B5244T5, B5254T2 only
- Volvo S80 (1999–2006)2006Engine B5204T5, B5254T2 only
- Volvo V50 (2004–2013)2006–2007Engine B5254T3 only
- Volvo V50 (2004–2013)2008–2012Engine B5254T7 only
- Volvo V70 (2000–2008)2006–2007Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo V70 (2000–2008)2008Engine B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2006Engine B5244T4, B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2007Engine B5254T2 only
- Volvo XC90 (2003–)2006–2012Engine B5254T2 only
- Volvo XC90 (2003–)2013–2014Engine B5254T9 only
- Volvo XC90 (2003–)2015
What does this fault code mean?
When the engine starts, the ECM compares the intake air temperature with the values from the fuel, outside air and engine temperature sensors. If the intake air temperature is too low compared with them, the fault is set, and the engine may be hard to start.
Possible causes
- Damaged intake air temperature sensor
- Contact resistance or oxidation in the connections to the intake air temperature sensor
What you can do
- 1Read the fault code, clear it and test drive to see whether it returns
- 2Check that the connectors to the intake air temperature sensor are free from play, oxidation and contact resistance
- 3If you have a diagnostic tool: after the engine has stood for a long time, the intake and engine temperatures should be close to each other
- 4If you have a diagnostic tool: if the intake air temperature does not match the other sensors now, the fault is permanent
- 5Check that the sensor wiring has no break and is not shorted to ground
- 6If the connectors and wiring are fine: have a workshop check or replace the sensor
Symptoms you may notice2
- Engine warning lamp comes on
- The engine is hard to start
What the fault can affect1
- The outside air temperature sensor value is used instead
General guidance for car owners. Diagnosis on the car can point to a different cause.