VOLVO
PHM-0004 - Hands-free loudspeaker. Signal too low. Intermittent fault (EU/OS)
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:
4 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007)
Show models by year and engine (4)
What does this fault code mean?
The fault is intermittent, meaning it is sporadic, and applies to cars with the EU/OS version. The phone module (PHM) registers that the signal to the hands-free speaker is short-circuited to ground. The hands-free mode then does not work, and only the handset can be used.
Possible causes
- The wiring between the hands-free speaker and the phone module is short-circuited to ground
What you can do
- 1Clear the code and road test the car to see whether it comes back
- 2Switch the ignition off and check the connector to the hands-free speaker, which is located under the driver's seat: check that it is secure and clean
- 3Use a multimeter to check that the wiring to the hands-free speaker has no contact with ground (the body)
- 4Look for chafing or pinching along the wiring to the hands-free speaker
- 5If you find no fault in the wiring, you can try replacing the hands-free speaker; otherwise have a workshop fault-trace it
Symptoms you may notice2
- Hands-free mode does not work
- A message in the text display, on cars with Volvo On Call
What the fault can affect1
- Only the handset works
General guidance for car owners. Diagnosis on the car can point to a different cause.