VOLVO
CEM-1A42 - Real time clock. 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:
10 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), S60 (2001–2009), S80 (1999–2006), V50 (2004–2013), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (10)
What does this fault code mean?
The CEM has an internal clock, and the fault code is set when the clock gives a wrong value or has stopped. The fault lies in the CEM or the control module, and the parking heater and the clock in the information module may then stop working.
Possible causes
- Internal fault in the CEM
- Internal fault in the control module
What you can do
- 1Clear the code and restart the car
- 2If you have a diagnostic tool, read the code after the restart and note whether it returns
- 3If the fault is permanent, have a workshop replace the CEM
Symptoms you may notice2
- The parking heater does not operate
- The information module clock does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.