VOLVO
PHM-U001088 - Medium Speed CAN Communication Bus. Bus Signal / Message Failures. Bus off
System
Phone Module (PHM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsS60 (2011–), V60 (2011–), V60 Cross Country (2015–), XC60 (2009–)
Show models by year and engine (4)
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 in which CAN communication is blocked, so the telephone module cannot be reached. The telephone module has then disconnected itself from the network (bus-off).
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
- 1Read the fault codes in the central electronics control module (CEM) with diagnostic equipment and trace the communication faults first
- 2Check the connectors at the telephone module and at the central electronics control module for oxidation, loose contacts and chafed wires
- 3If control modules are stuck in limp-home mode, disconnect the negative battery terminal for a while
- 4If the fault remains, a workshop should measure the resistance in the CAN network and establish which module is disturbing it
Symptoms you may notice3
- The mobile phone has problems, and a message appears in the text display
- Volvo On Call does not work as it should
- Text window and warning symbol with a text message
What the fault can affect1
- The control module disconnects itself from the CAN network (bus-off)
General guidance for car owners. Diagnosis on the car can point to a different cause.