VOLVO
CEM-6C57 - Phone module (PHM) not valid. Faulty signal
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
5 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
What does this fault code mean?
CEM continuously receives information from the phone module (PHM) and checks it. The fault code is set when the phone module sends an incorrect value to CEM. The symptom is that Volvo On Call does not work.
Possible causes
- Incorrect software in the phone module (PHM)
- Incorrect software in the CEM
- A common fault in the CAN network, if several other communication faults are stored in the CEM
What you can do
- 1Ask a workshop to update the software in the phone module, as that is usually what remedies the fault
- 2If the fault remains, ask the workshop to update the software in the CEM
- 3Do not replace the CEM unnecessarily
Symptoms you may notice2
- Volvo On Call does not work
- Other Volvo On Call problems
General guidance for car owners. Diagnosis on the car can point to a different cause.