VOLVO
CEM-1E05 - Communication with the additional heater module. Signal missing. Intermittent fault
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
What does this fault code mean?
The CEM lost communication with the additional heater (CPM) at some point shortly after the ignition was switched on. The fault is intermittent, so it may not be present right now. The parking heater may then fail to work.
Possible causes
- A broken or shorted wire between the heater and the CEM
- A defective communication unit in the additional heater
- A defective communication unit in the CEM
What you can do
- 1If the car has a timer or remote start for the parking heater, start it and check that it runs
- 2Check that the connectors to the additional heater and the CEM are seated and not corroded
- 3Use a multimeter to check that the cable between the heater and the CEM has no break or short to ground
- 4With a diagnostic tool, read the fault codes and see whether communication with the heater works
- 5After the work, clear the code and check that the parking heater works
Symptoms you may notice1
- The parking heater does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.