VOLVO
PHM-0066 - Volvo On Call buttons Signal too high/Signal missing
System
Phone Module (PHM)
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:
6 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013), XC90 (2003–)
What does this fault code mean?
The voltage measured over the SOS On Call switch differs from what is expected. It is either too high or missing completely, and the fault comes from an open circuit or from the wire being short-circuited to supply voltage. Volvo On Call does not work, and a text message with a warning symbol may appear.
Possible causes
- The wire between the SOS and/or On Call switch and the phone control module (PHM) has an open circuit
- The wire between the SOS and/or On Call switch and the phone control module (PHM) is short-circuited to supply voltage
What you can do
- 1Check that the connectors to the switches are firmly seated and free from corrosion
- 2Test the SOS and On Call buttons in the car to see whether they respond as they should
- 3If you have a diagnostic tool, follow the voltage across the SOS On Call switch in live data and see whether it changes when the button is pressed
- 4If the fault returns, have a workshop with diagnostic equipment repair the wire or replace the switch
Symptoms you may notice2
- Volvo On Call does not work
- A text message appears together with a warning symbol
General guidance for car owners. Diagnosis on the car can point to a different cause.