Diagnostic trouble code (DTC) information
Condition
Diagnostic trouble code (DTC) PHM-0020 is stored if the carphone module registers that there is a short-circuit to supply voltage in the signal to the handset microphone.
Substitute Value
- Only hands-free operates.
Possible Source
- Short-circuit to supply voltage in the wiring (MIC signal) between the handset and the control module.
Fault symptom[s]
- The carphone handset is not functioning
- Message in the text display (for carphones with Volvo On Call).