VOLVO
ECM-2720 - Engine coolant temperature (ECT) sensor. Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (6)
- Volvo S60 (2001–2009)2005Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo S80 (1999–2006)2005Engine B5204T5, B5244T4, B5254T2, B6294S2, B6294T only
- Volvo S80 (1999–2006)2006Engine B5244T4 only
- Volvo V70 (2000–2008)2005Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo V70 XC / XC70 (2001–2007)2005All engines except: D5244T
- Volvo XC90 (2003–)2005Engine B5254T2, B6294T only
What does this fault code mean?
The ECM compares the sensor signal with a calculated engine temperature. If the signal stays static and does not match the calculated value, the code is set. It is stored together with another fault code for the coolant temperature sensor.
Possible causes
- Contact resistance and oxidation in the connectors
- The temperature sensor is damaged
What you can do
- 1Read the other fault code for the coolant temperature sensor first and fix it
- 2Disconnect the connector to the electric cooling fan before working in the engine bay, since the fan can run even when the ignition is off
- 3Check the connector on the temperature sensor for contact resistance and oxidation
- 4Check the coolant level and that the coolant has the right freeze protection, since a frozen sensor can cause this code
- 5With diagnostic equipment, read the engine temperature after starting and see whether it rises in step with warm-up
Symptoms you may notice2
- Malfunction indicator lamp (MIL) on
- The engine is hard to start
General guidance for car owners. Diagnosis on the car can point to a different cause.