VOLVO
CEM-3A05 - fuel pump. Signal too low. Intermittent fault
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 sees a wrong signal in the coil circuit of the fuel pump relay. The fault is intermittent, so it may have occurred before without being active now. The engine may then fail to start.
Possible causes
- A fault in the fuel pump relay coil circuit
What you can do
- 1Check that the fuel pump relay is fully and correctly fitted
- 2Check the relay connections and clean them if they are corroded. Tighten any loose contacts
- 3With a diagnostic tool, activate the fuel pump relay and listen for a click
- 4After the work, clear the code and check that the engine starts normally
Symptoms you may notice1
- The engine does not start
General guidance for car owners. Diagnosis on the car can point to a different cause.