VOLVO
AEM-5F11 - Relay, engine block heater. Signal too high or Signal missing. Permanent fault
System
Accessory Electronic Module (AEM)
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 signal to the electric engine block heater relay is too high or missing, and the fault persists right now. The relay is switched off and the block heater does not work. The fault is most often caused by a wiring fault in the signal or ground wire, or a faulty relay.
Possible causes
- Signal wire to the relay shorted to supply voltage
- Break in the signal wire to the relay
- Break in the ground wire to the relay
- Faulty engine block heater relay
What you can do
- 1Check the signal and ground wires to the relay for breaks and chafing
- 2Look for a short to supply voltage on the signal wire
- 3Check the relay connector for oxidation and loose connections
- 4If the fault remains, have a workshop replace the relay
Symptoms you may notice1
- Poor heating in the passenger compartment
What the fault can affect1
- The engine block heater relay is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.