VOLVO
CEM-3A07 - Relay, leak diagnostic pump heating. Signal too high
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. If the CEM registers a short to supply voltage, the code is set. The fault shows when the relay is activated and is usually caused by a defective relay.
Possible causes
- A defective relay
What you can do
- 1Switch the ignition off, replace the leak diagnostic pump heating relay with an identical one, and switch the ignition on again
- 2Activate the relay. It should click. If it does, the relay was probably the source of the fault
- 3Check that the relay sits firmly in place and that its contacts are clean
- 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.