VOLVO
CEM-U013600 - Lost Communication With Differential Control Module - Rear. General Failure Information. No sub type information
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:
7 modelsS60 (2011–), S80 (2007–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The fault code means that the control module storing the fault has no working link to the rear differential control module (DEM), or the link is disturbed. The rear differential module controls the all-wheel drive, so a break in the link may leave the all-wheel drive inactive.
Possible causes
- No power supply to the differential control module (DEM)
- Broken ground wire to the differential control module
- Poor contact in the connections
- Open or shorted CAN wiring
- A module not intended for the car, such as a used unit with other software or hardware
What you can do
- 1Switch the ignition off and check the wire from the rear relay and fuse centre to the module for breaks and a short to ground
- 2Check that the power supply relay in the rear relay and fuse centre works
- 3Check the module ground wire for breaks or a short to voltage
- 4If the fault returns, have a workshop check the CAN wiring. Replace the CEM only if testing shows the CEM is damaged
Symptoms you may notice3
- All-wheel drive does not work
- Message in the information display
- General warning lamp is on
General guidance for car owners. Diagnosis on the car can point to a different cause.