What does fault code CEM-1A23 mean?

Diagnostic fault code details for CEM-1A23 (Volvo S60 (2001–2009), Volvo S80 (1999–2006), Volvo V70 (2000–2008)). Repair service at OBD Tuning.

VOLVO

CEM-1A23 - Increased power supply relay. No signal. Intermittent fault

System

Central Electronic Module (CEM)

Volvo models this fault code applies to

Applies to the following models:

5 models

S60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)

Show models by year and engine (5)

What does this fault code mean?

The CEM has registered an open circuit in the signal wire to the extended X-supply relay, or that the relay is not seated correctly. The fault is intermittent, meaning it comes and goes.

Possible causes

Incorrectly installed relay
Contact resistance in the relay terminal

What you can do

1Check that the relay sits correctly in its place and is fully pushed in
2Check that the relay connection is secure and clean
3Clear the code and road test the car to see whether it returns
4If the fault returns, have a workshop replace the relay

Symptoms you may notice3

Power seat does not operate at all
The instrument lighting does not operate
No instruments are working

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