VOLVO
ECM-140D - Outside temperature sensor. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
8 modelsC70 (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 (17)
- Volvo C70 (2006–2013)2006Engine B5254T3 only
- Volvo S40 (2004–2013)2005–2006Engine B5254T3 only
- Volvo S60 (2001–2009)2005–2006Engine 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)2005–2006Engine B5204T5, B5244T4, B5254T2, B6294S2, B6294T only
- Volvo V50 (2004–2013)2005–2006Engine B5254T3 only
- Volvo V70 (2000–2008)2005Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 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)2005All engines except: D5244T
- Volvo V70 XC / XC70 (2001–2007)2006Engine B5244T4, B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2007Engine B5254T2 only
- Volvo XC90 (2003–)2005–2006Engine B5254T2, B6294T only
- Volvo XC90 (2003–)2007–2012Engine B5254T2 only
- Volvo XC90 (2003–)2013–2014Engine B5254T9 only
- Volvo XC90 (2003–)2015
What does this fault code mean?
The fault is set when the outside air temperature sensor is shorted to voltage, and also when the central electronics module (CEM) judges the signal to be too low. The signal reaches the engine control module (ECM) over the CAN bus.
Possible causes
- Contact resistance in the connections
- Signal wire shorted to voltage
- Open circuit in the signal wire
- Damaged outside air temperature sensor
What you can do
- 1First read the fault codes in the central electronics module (CEM) and fix them
- 2Check the wiring and connectors to the outside air temperature sensor for contact resistance and oxidation
- 3If you have a diagnostic tool: read the outside temperature in live data with the ignition on; if it becomes reasonable once the connector is cleaned, poor contact was the likely cause
- 4The sensor may have been damaged by the signal wire being shorted to voltage; check the wiring before replacing the sensor
- 5If the wiring is fault-free but the fault remains: have a workshop measure the sensor's resistance and replace it if needed
Symptoms you may notice3
- Engine warning lamp comes on
- Starting problems, the engine cranks slowly
- The outside temperature gauge shows wrong values or does not work
What the fault can affect1
- The engine uses the value from the intake air temperature sensor
General guidance for car owners. Diagnosis on the car can point to a different cause.