VOLVO
PHM-U001000 - Medium Speed CAN Communication Bus. General Failure Information. No sub type information
System
Phone Module (PHM)
Volvo models this fault code applies to
Applies to the following models:
9 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The control modules in the car communicate over the CAN network. The telephone module (PHM) registers a serious disturbance where CAN communication is blocked, and then the telephone module cannot be reached. The fault may lie in the network wiring or in a control module that disturbs communication.
Possible causes
- Short circuit between the CAN wires
- Break in one of the CAN wires
- Internal fault in the telephone module (PHM)
- Internal fault in another control module on the same part of the CAN network
What you can do
- 1With diagnostic equipment, read the fault codes in the central electronics control module (CEM) and trace first the codes for communication faults
- 2Check the connectors at the telephone module and at the central electronics control module for oxidation, loose contacts and chafed wires
- 3Lift the negative battery terminal for a while and reconnect it if some control modules have ended up in limp-home mode
- 4If the fault remains, have a workshop measure the resistance in the CAN network and establish which control module is disturbing communication
Symptoms you may notice3
- Volvo On Call has no function or reduced function
- The phone has no function or reduced function
- The mobile phone has problems, and a message appears in the text display
What the fault can affect1
- The control module switches itself off (bus-off)
General guidance for car owners. Diagnosis on the car can point to a different cause.