VOLVO
ECM-200A - Engine coolant temperature (ECT) sensor. Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
13 modelsC30 (2007–2013), C70 (2006–2013), C70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S40 (2004–2013), S60 (2001–2009), S70 (1997–2000), S80 (1999–2006), V50 (2004–2013), V70 (1997–2000), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (47)
- Volvo C30 (2007–2013)2007Engine B5244S4, D4164T, D5244T8, D5244T9 only
- Volvo C30 (2007–2013)2008–2010Engine B5244S4, D4164T, D5244T13, D5244T8, D5244T9 only
- Volvo C30 (2007–2013)2011Engine B5244S4, D4164T 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 C70 Cabriolet (1998–2005)2000Engine B5244S only
- Volvo C70 Coupé (1998–2002)1999Engine B5254S DENSO only
- Volvo C70 Coupé (1998–2002)2000Engine B5244S only
- Volvo S40 (2004–2013)2004Engine B5244S4, B5244S5 only
- Volvo S40 (2004–2013)2005Engine B5244S4, B5244S5, B5244S7, D4164T only
- Volvo S40 (2004–2013)2006Engine B5244S4, B5244S5, B5244S7, D4164T, D5244T8 only
- Volvo S40 (2004–2013)2007Engine B5244S4, B5244S5, B5244S7, D4164T, D5244T8, D5244T9 only
- Volvo S40 (2004–2013)2008, 2010Engine B5244S4, B5244S5, B5244S7, D4164T, D5244T13, D5244T8, D5244T9 only
- Volvo S40 (2004–2013)2009All engines except: B4164S3, B4184S11, B4184S8, B4204S3, B5254T7, D4204T
- Volvo S40 (2004–2013)2011Engine D4164T only
- Volvo S60 (2001–2009)2001Engine B5244S, B5244S2 only
- Volvo S60 (2001–2009)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 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 S70 (1997–2000)1999Engine B5254S DENSO only
- Volvo S70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)1999–2000Engine B5244S, B5244S2 only
- Volvo S80 (1999–2006)2001, 2006Engine B5244S, B5244S2, B5244SG only
- Volvo S80 (1999–2006)2002–2005Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V50 (2004–2013)2004Engine B5244S4, B5244S5 only
- Volvo V50 (2004–2013)2005Engine B5244S4, B5244S5, B5244S7, D4164T only
- Volvo V50 (2004–2013)2006Engine B5244S4, B5244S5, B5244S7, D4164T, D5244T8 only
- Volvo V50 (2004–2013)2007Engine B5244S4, B5244S5, B5244S7, D4164T, D5244T8, D5244T9 only
- Volvo V50 (2004–2013)2008–2009All engines except: B4164S3, B4184S11, B4184S8, B4204S3, B5254T7, D4204T
- Volvo V50 (2004–2013)2010Engine B5244S4, B5244S5, B5244S7, D4164T, D5244T13, D5244T8, D5244T9 only
- Volvo V50 (2004–2013)2011Engine D4164T only
- Volvo V70 (1997–2000)1999Engine B5254S DENSO only
- Volvo V70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2001Engine B5244S, B5244S2, B5244SG only
- Volvo V70 (2000–2008)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 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 ECM compares the coolant temperature sensor reading with the intake air and outside air temperatures once the engine has stood for a long while. If the sensor value deviates too much from the other temperatures, the code is set. The fault can be caused by poor contact in the sensor connector, a defective thermostat or a damaged sensor.
Possible causes
- Poor contact in the sensor connector
- Defective thermostat
- Damaged engine coolant temperature sensor
What you can do
- 1Read and clear the fault code and check whether it returns
- 2Check the sensor connector for play, contact resistance and oxidation, and check the wire for chafing and open circuit
- 3If you have a diagnostic tool, compare the engine coolant temperature in live data with the intake and outside air temperatures after the car has stood still for a long while
- 4Check that the thermostat opens as the engine warms up
- 5Keep your hands away from the cooling fan during checks, since it can start even when the ignition is off
- 6Have a workshop replace the engine coolant temperature sensor if the fault remains
Symptoms you may notice5
- The engine is difficult to start, especially on a hot restart
- Driveability problems during warm-up
- The cooling fan can keep running with the ignition off
- The malfunction indicator lamp (MIL) is lit
- The engine stalls, but only when warm
What the fault can affect3
- The engine coolant temperature is calculated theoretically after start
- The engine cooling fan runs at low speed
- Engine torque may be limited
General guidance for car owners. Diagnosis on the car can point to a different cause.