VOLVO
PHM-0001 - Power supply. Faulty signal. Intermittent fault
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)
What does this fault code mean?
The fault is intermittent, meaning it is sporadic: it may have occurred at some point but does not have to be present now. The phone module (PHM) has detected a voltage fault, including when the voltage in the keypad or the phone module differs too much from the voltage in the central electronic module (CEM).
Possible causes
- Half-burned fuse for the phone module (PHM)
- Defective wiring
- Internal fault in the phone module (PHM)
- The voltage from the keypad or phone module differs too much from the central electronic module (CEM) voltage
What you can do
- 1Read and note the code, clear it and road test the phone to see whether it comes back
- 2Check that the phone fuse in the passenger compartment fuse box is not half-burned, since such a fuse can cause sporadic faults
- 3Check that the wiring to the phone is intact and that the connectors are secure
- 4If the code does not come back, no further action is needed
- 5If the code comes back, have a workshop check the phone module and its voltage
Symptoms you may notice1
- The phone does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.