What does fault code PHM-U210991 mean?

Diagnostic fault code details for PHM-U210991 (Volvo S60 (2011–), Volvo S80 (2007–), Volvo V40 (2013–)). Repair service at OBD Tuning.

VOLVO

PHM-U210991 - Back-up battery. Component Failures. Parametric

System

Phone Module (PHM)

Volvo models this fault code applies to

Applies to the following models:

9 models

S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)

Show models by year and engine (9)

What does this fault code mean?

The telephone module (PHM) checks the internal back-up system, of which the back-up battery is part. The fault is stored when the back-up battery has too low capacity, which can stop Volvo On Call from working.

Possible causes

The internal back-up battery has too low capacity

What you can do

1Make sure the back-up battery inside the telephone module, used by Volvo On Call, is wired correctly
2Check the connector at the back-up battery for loose contacts and corrosion
3If needed, a workshop will replace the internal back-up battery in the telephone module

Symptoms you may notice3

Volvo On Call has no function or reduced function
Text window and warning symbol with a text message
Volvo On Call does not work at all

General guidance for car owners. Diagnosis on the car can point to a different cause.