VOLVO
PHM-6A15 - Handset microphone Signal too high/Signal missing
System
Phone Module (PHM)
Volvo models this fault code applies to
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 microphone signal from the handset is either short-circuited to supply voltage or has an open circuit, so the signal can be too high or missing. The other party then cannot hear when the handset is used, and only hands-free works. A warning message appears in the text display.
Possible causes
- The microphone signal wire between the handset and the control module is short-circuited to supply voltage
- The microphone signal wire between the handset and the control module has an open circuit
What you can do
- 1Check that the handset connector is firmly seated and free from corrosion
- 2Use a multimeter to check that the microphone wire has no open circuit, once the connector is checked
- 3If no open circuit is found, have a workshop check that the microphone wire is not short-circuited to supply voltage
Symptoms you may notice2
- The other party cannot hear when the handset is used
- A text message appears together with a warning symbol
What the fault can affect1
- Only hands-free operates
General guidance for car owners. Diagnosis on the car can point to a different cause.