VOLVO
PHM-001B - Carphone handset power supply. Signal too low. Intermittent fault
System
Phone Module (PHM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS80 (1999–2006), V70 (2000–2008)
Show models by year and engine (2)
What does this fault code mean?
Although the code is named signal too low for the handset power supply, it applies to the power supply to the handset being short-circuited to ground. The fault is intermittent, so it may come and go. The handset does not work while the fault is present, and a message appears in the instrument cluster.
Possible causes
- The handset power supply is short-circuited to ground
What you can do
- 1Check that the connectors at the handset and at the keypad unit or carphone control module (PHM) are secure and free from corrosion
- 2Read and note the code, clear it and road test the car to see whether it returns
- 3If it returns, have a workshop with diagnostic equipment check the handset wiring for a short to ground
Symptoms you may notice2
- The handset does not work
- Message in the instrument cluster that the handset is not working
General guidance for car owners. Diagnosis on the car can point to a different cause.