VOLVO
CEM-3A02 - fuel pump. Signal faulty
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
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 engine may start poorly or not at all, and idle may be uneven.
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 seated in the relay and fuse box
- 2Check the relay connections. If they are corroded or loose, clean them and tighten them
- 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 runs smoothly
Symptoms you may notice2
- The engine does not start
- Uneven idle
General guidance for car owners. Diagnosis on the car can point to a different cause.