VOLVO
PHM-0064 - Illumination buttons Signal too low
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 feeding the SOS On Call switch backlight is too low. The code relates to a wire that is short-circuited to ground. The result is problems with Volvo On Call and the mobile phone.
Possible causes
- The wire that lights the SOS On Call switch is short-circuited to ground
What you can do
- 1Check that the connector to the SOS On Call switch is firmly seated and free from corrosion
- 2If the connector is in order, use a multimeter to check that the lighting wire has no contact with ground (the body)
- 3Read and note the code before clearing it, then road test the car to see whether it returns
- 4If it returns, have a workshop check the lighting wire and correct the fault
Symptoms you may notice2
- Other Volvo On Call problems
- Other mobile phone problems
General guidance for car owners. Diagnosis on the car can point to a different cause.