VOLVO
CEM-6C30 - Siren. Internal fault
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (10)
- Volvo C30 (2007–2013)2007–2011
- Volvo C30 (2007–2013)2012All engines except: D4162T, D5204T, D5204T5
- Volvo C30 (2007–2013)2013Engine B4204S3, B4204S4, B5254T7 only
- Volvo C30 Electric (2011–2013)2011–2013
- Volvo C70 (2006–2013)2006–2011
- Volvo C70 (2006–2013)2012–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2004–2010
- Volvo S40 (2004–2013)2011–2012All engines except: D4162T, D5204T, D5204T5
- Volvo V50 (2004–2013)2004–2010
- Volvo V50 (2004–2013)2011–2012All engines except: D4162T, D5204T, D5204T5
What does this fault code mean?
The CEM has been told that the siren control module has registered an internal fault, or that the vehicle battery has been discharged. The alarm may then fail to start when needed. The cause may be a damaged fuse, an internal fault in the siren or too low voltage in the battery or in the siren's internal battery.
Possible causes
- Damaged fuse
- Internal fault in the siren control module
- Battery voltage too low
- Too low voltage in the siren's internal battery
What you can do
- 1Check that the vehicle battery is correctly charged, and charge it if needed
- 2Close all doors, lock the car with the remote control and then unlock it again
- 3Clear the fault code and read it again to see whether it is still present
- 4Check that the fuse for the alarm is intact and replace it if it has blown
- 5If the fault keeps returning, the siren may need replacing, which a workshop should do
Symptoms you may notice3
- Alarm does not start
- No visible or audible signal from the alarm
- Warning symbol and text message in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.