VOLVO
REM-8B21 - License plate lighting. Signal too low
System
Rear Electronic Module (REM)
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 rear electronic module (REM) powers the number plate lighting directly from an output. The fault is stored when the module registers a faulty signal at that output.
Possible causes
- Signal cable shorted to ground
What you can do
- 1Read and clear the fault code, then check whether it returns when you switch the lighting on
- 2With the ignition off, use a multimeter to check that the signal cable to the number plate lighting is not shorted to ground
- 3Check that the number plate lamps work and that their connectors are secure
- 4If the fault remains, have a workshop with diagnostic equipment check the wiring and the REM
Symptoms you may notice1
- The number plate lighting does not work
What the fault can affect1
- On cars built from late September 2005, the output is switched off permanently if the fault has been present over many ignition cycles, until the fault code is cleared
General guidance for car owners. Diagnosis on the car can point to a different cause.