VOLVO
PHM-7B12 - Handset supply Signal too high
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 voltage supply to the handset is registered as too high, because the supply wire is short-circuited to supply voltage. The handset then does not work for individual calls, but hands-free does.
Possible causes
- The supply wire to the handset from the carphone control module (PHM) is short-circuited to supply voltage
What you can do
- 1Note the code before it is cleared, so the workshop can see it
- 2Make sure the connector on the handset is seated properly and free from corrosion
- 3If no fault is found in the supply wire, have a workshop try replacing the handset
Symptoms you may notice3
- The handset does not work for individual calls
- The other party cannot be heard or cannot hear through the handset
- 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.