VOLVO
ECM-2000 - Engine coolant temperature (ECT) sensor. Signal too low
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:
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 (31)
- Volvo C30 (2007–2013)2007Engine B5244S4, D5244T8, D5244T9 only
- Volvo C30 (2007–2013)2008–2010Engine B5244S4, D5244T13, D5244T8, D5244T9 only
- Volvo C30 (2007–2013)2011Engine B5244S4 only
- Volvo C70 (2006–2013)2006–2007All engines except: B5254T3
- Volvo C70 (2006–2013)2008–2010All engines except: B5254T7, D4204T
- Volvo C70 (2006–2013)2011Engine B5244S4 only
- Volvo S40 (2004–2013)2004Engine B5244S4, B5244S5 only
- Volvo S40 (2004–2013)2005Engine B5244S4, B5244S5, B5244S7 only
- Volvo S40 (2004–2013)2006Engine B5244S4, B5244S5, B5244S7, D5244T8 only
- Volvo S40 (2004–2013)2007Engine B5244S4, B5244S5, B5244S7, D5244T8, D5244T9 only
- Volvo S40 (2004–2013)2008–2010Engine B5244S4, B5244S5, B5244S7, D5244T13, D5244T8, D5244T9 only
- Volvo S60 (2001–2009)2003–2005Engine B5244S, B5244S2, B5244S6, B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2006All engines except: B5204T5, B5244T4, B5244T5, B5254T2, B5254T4, D5244T, D5244T2
- Volvo S60 (2001–2009)2007All engines except: B5204T5, B5244T5, B5254T2, B5254T4
- Volvo S60 (2001–2009)2008–2009All engines except: B5204T5, B5244T5, B5254T2
- Volvo S80 (1999–2006)2003–2005Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)2006Engine B5244S, B5244S2, B5244SG only
- Volvo V50 (2004–2013)2004Engine B5244S4, B5244S5 only
- Volvo V50 (2004–2013)2005Engine B5244S4, B5244S5, B5244S7 only
- Volvo V50 (2004–2013)2006Engine B5244S4, B5244S5, B5244S7, D5244T8 only
- Volvo V50 (2004–2013)2007Engine B5244S4, B5244S5, B5244S7, D5244T8, D5244T9 only
- Volvo V50 (2004–2013)2008–2010Engine B5244S4, B5244S5, B5244S7, D5244T13, D5244T8, D5244T9 only
- Volvo V70 (2000–2008)2003–2005Engine B5244S, B5244S2, B5244S6, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2006All engines except: B5204T5, B5244T5, B5254T2, B5254T4, D5244T, D5244T2
- Volvo V70 (2000–2008)2007All engines except: B5204T5, B5244T5, B5254T2, B5254T4
- Volvo V70 (2000–2008)2008All engines except: B5254T2
- Volvo V70 XC / XC70 (2001–2007)2006–2007Engine D5244T4 only
- Volvo XC90 (2003–)2006–2007Engine D5244T4 only
- Volvo XC90 (2003–)2008–2010Engine D5244T4, D5244T5 only
- Volvo XC90 (2003–)2011Engine D5244T18, D5244T4, D5244T5 only
- Volvo XC90 (2003–)2012All engines except: B5254T2, B6324S5
What does this fault code mean?
The engine control module (ECM) has registered that the signal from the engine coolant temperature sensor is too low. The fault can be caused by the circuit being short-circuited to ground, by poor contact in the connections or by a damaged sensor. The engine control module then uses a calculated engine temperature, and the cooling fan can run even when the ignition is off.
Possible causes
- Signal wire short-circuited to ground
- Contact resistance or oxidation in the connections
- Damaged engine coolant temperature sensor
What you can do
- 1Read and clear the fault code and check whether it returns
- 2Be careful around the cooling fan: it can start even when the ignition is off, so keep hands and tools away from it
- 3Check the connector at the coolant temperature sensor for play, oxidation and corrosion
- 4Check the wire to the sensor for chafing, pinch damage and a short to ground
- 5Use a multimeter to check that the signal wire is not short-circuited to ground (body)
- 6If you have a diagnostic tool, read the engine coolant temperature in live data and check that it follows the engine warming up
Symptoms you may notice5
- The malfunction indicator lamp (MIL) is lit
- The engine is difficult to start when warm
- Uneven idle
- The engine may stop, but only when it is warm
- The cooling fan can keep running with the ignition off
What the fault can affect2
- A calculated engine temperature is used instead of the sensor signal
- The engine cooling fan runs at low speed
General guidance for car owners. Diagnosis on the car can point to a different cause.