VOLVO
ECM-0118 - Engine coolant temperature (ECT) sensor. Signal too high
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (18)
- Volvo C30 (2007–2013)2007–2009Engine B4164S3, B4184S11, B4184S8, B4204S3, D4204T only
- Volvo C30 (2007–2013)2010Engine B4164S3, B4184S11, B4184S8, B4204S3, B4204S4, D4204T only
- Volvo C30 (2007–2013)2011–2012Engine B4164S3, B4204S3, B4204S4 only
- Volvo C30 (2007–2013)2013Engine B4204S3, B4204S4 only
- Volvo C70 (2006–2013)2008Engine D4204T only
- Volvo C70 (2006–2013)2009–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo S40 (2004–2013)2004Engine D4204T, D4204T2 only
- Volvo S40 (2004–2013)2005Engine B4164S3, B4184S11, D4204T, D4204T2 only
- Volvo S40 (2004–2013)2006Engine B4164S3, B4184S11, B4184S8, D4204T, D4204T2 only
- Volvo S40 (2004–2013)2007–2009Engine B4164S3, B4184S11, B4184S8, B4204S3, D4204T only
- Volvo S40 (2004–2013)2010Engine B4164S3, B4184S11, B4184S8, B4204S3, B4204S4, D4204T only
- Volvo S40 (2004–2013)2011–2012Engine B4164S3, B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2004Engine D4204T, D4204T2 only
- Volvo V50 (2004–2013)2005Engine B4164S3, B4184S11, D4204T, D4204T2 only
- Volvo V50 (2004–2013)2006Engine B4164S3, B4184S11, B4184S8, D4204T, D4204T2 only
- Volvo V50 (2004–2013)2007–2009Engine B4164S3, B4184S11, B4184S8, B4204S3, D4204T only
- Volvo V50 (2004–2013)2010Engine B4164S3, B4184S11, B4184S8, B4204S3, B4204S4, D4204T only
- Volvo V50 (2004–2013)2011–2012Engine B4164S3, B4204S3, B4204S4 only
What does this fault code mean?
The engine control module has registered a coolant temperature signal that is too high. The cause is most often a signal wire touching supply voltage, but a damaged sensor or control module, an extremely low engine temperature, or an incorrect reference voltage can also cause it.
Possible causes
- Signal wire shorted to supply voltage
- Damaged engine coolant temperature sensor
- Very low engine coolant temperature
- Incorrect reference voltage
- Damaged control module
What you can do
- 1With the ignition off, unplug the coolant sensor connector and check the contacts for contact resistance and oxidation
- 2With the ignition on and the connector unplugged, use a multimeter on the signal wire; voltage there indicates a short to supply voltage
- 3If you have a diagnostic tool, read the engine temperature in live data and see whether the value matches how cold or warm the engine is
- 4If the wire is sound and the fault remains, have a workshop check the sensor and the control module
Symptoms you may notice1
- Malfunction indicator lamp (MIL) lights up
General guidance for car owners. Diagnosis on the car can point to a different cause.