VOLVO
REM-4F45 - Parking sensor 4. Faulty signal
System
Rear Electronic Module (REM)
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?
Parking sensor 4 is the subject of this code: the parking assistance module (PAM) does not accept its signal, so the code is set. Parking assistance then fails, and a message may come up in the display.
Possible causes
- Signal wire between the PAM and parking sensor 4 shorted to supply voltage or ground
- Power supply wire to parking sensor 4 shorted to ground
- Ground wire to parking sensor 4 shorted to supply voltage
What you can do
- 1Clear the fault code and test drive the car to see whether it comes back
- 2Use a multimeter to check that the signal wire to parking sensor 4 is not shorted to supply voltage or ground when the ignition is off
- 3Use a multimeter to check that the power supply wire is not shorted to ground and that the ground wire is not shorted to supply voltage
- 4If no fault is found, have a workshop replace parking sensor 4
Symptoms you may notice2
- Parking assistance stops working
- Message in the text display
General guidance for car owners. Diagnosis on the car can point to a different cause.