What does fault code CEM-B10E511 mean?

Diagnostic fault code details for CEM-B10E511 (Volvo S60 (2011–), Volvo S80 (2007–), Volvo V40 (2013–)). Repair service at OBD Tuning.

VOLVO

CEM-B10E511 - Engine control module (ECM) wake-up signal. General Electrical Failures. Circuit short to ground

System

Central Electronic Module (CEM)

Volvo models this fault code applies to

Applies to the following models:

9 models

S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)

Show models by year and engine (9)

What does this fault code mean?

The start signal going to the engine control module (ECM) is supervised by the CEM, which also watches the voltage on the signal cable. The code is stored when the cable is short-circuited to ground. The start signal can then not reach the engine control module, and the engine cannot be started.

Possible causes

The signal cable is short-circuited to ground

What you can do

1Read and note the code, clear it and road test to see whether it returns
2Check that the relevant fuses are intact. Their locations are in the owner's manual or on the fuse box cover
3Look for chafing and loose connections in the harness to the engine control module
4Use a multimeter to check that the signal cable from the CEM to the engine control module has no contact with ground (the body)
5If you have a diagnostic tool: read the start signal status in live data during a start attempt
6If the fault returns, have a workshop with diagnostic equipment check the cable and the control module

Symptoms you may notice5

Engine does not start
Starter motor does not operate
Engine does not turn over, and no clicking sound is heard at a start attempt
Engine does not turn over, but there is a clicking sound at a start attempt
Starting problems come and go or happen all the time

What the fault can affect3

The output switches off during the driving cycle in which the fault is detected
If the fault remains, the output switches off permanently after 100 driving cycles
When the codes are cleared and a new driving cycle starts, the output is reset

General guidance for car owners. Diagnosis on the car can point to a different cause.