VOLVO
CEM-3A08 - Relay, leak diagnostic pump heating. Signal too low
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:
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 monitors the coil of the leak test pump heater relay. The code is set when the signal is missing or too low. The fault may be caused by a missing relay, a defective relay, or a contact fault in the relay socket.
Possible causes
- Relay missing
- A defective relay
- Contact resistance in the relay socket
What you can do
- 1Remove the leak diagnostic pump heating relay and check that the socket contacts are clean and not corroded. Refit the relay
- 2With the ignition on, activate the relay. It should click
- 3If it does not click, replace the relay with an identical one and check again
- 4After the work, clear the code and check that it does not return
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.