Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information PHM-U001000

Condition
The control modules transmit and receive information via a standardized serial communication method - CAN (Control Area Network).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- Serious interference on the low-speed network is registered, CAN communication blocked.

Note! In the event of communication faults in the system, the Phone module (PHM) cannot be communicated with. Therefore it will only be possible to read off the fault if it is intermittent.





Substitute value
- Control module shuts itself off ("bus-off").

Possible source
- Short-circuit between the control area network (CAN) wiring.
- Open-circuit in the control area network (CAN) wiring.
- Internal fault in the phone module (PHM).
- Internal fault in another control module in the same part of the control area network (CAN).

Fault symptom[s]
- Missing or reduced functionality for Volvo On Call
- Missing or reduced functionality in the phone