VOLVO
ECM-P059800 - Thermostat Heater Control Circuit Low. General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
8 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (8)
- Volvo S60 (2011–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo S80 (2007–)2014–2015Engine B4204T11, B4204T12, B4204T15 only
- Volvo V40 (2013–)2015Engine B4204T11 only
- Volvo V40 Cross Country (2013–)2015Engine B4204T11 only
- Volvo V60 (2011–)2014–2015Engine B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo V70 (2008–)2014–2015Engine B4204T11 only
- Volvo XC60 (2009–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo XC70 (2008–)2014–2015Engine B4204T11 only
What does this fault code mean?
The ECM checks the thermostat. The code is set when the voltage on the signal wire from the thermostat is too low, and the check is made with the ignition on.
Possible causes
- Contact resistance or oxidation in connections
- The signal wire to the thermostat is shorted to ground
- Damaged thermostat
What you can do
- 1Check that the fuses are intact
- 2Check the connectors at the thermostat and the control module for contact resistance and oxidation
- 3Use a multimeter to check that the signal wire is not shorted to ground
- 4Clear the code and road test the car, then see whether it returns
- 5If the fault remains, have a workshop check the thermostat
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.