Diagnostic Trouble Code (DTC) Information PHM-U210909

Condition 

The spare battery is located in the Phone module (PHM) and used when a Volvo On Call service is connected and the Phone module (PHM) does not have access to voltage supply from the main battery.

The diagnostic trouble code (DTC) is stored if the control module detects that:

• The internal auxiliary battery is damaged or not connected.

The control module's test for the diagnostic trouble code (DTC) starts when:

• At least 24 hours have passed since last test.
• Battery voltage between 9 - 16 V.

Substitute Value 

• None.

Possible Source 

• The internal spare battery is not connected to the Phone module (PHM).
• The spare battery's voltage is less than 4.5 V.
• Internal reserve battery is damaged.

Fault symptom[s] 

• Volvo On Call/Does not work
• Text window and warning symbol/Text message