VOLVO
CRM-20C4 - Hallsensor 18 (SL_FR_0). Activation timeout
System
Chassis (Brakes, Steering, Suspension)
Volvo models this fault code applies to
Applies to the following models:
1 modelC70 (2006–2013)
Show models by year and engine (1)
What does this fault code mean?
Hall sensor 18 has not reached the expected position within a set time after the roof started to move. The expected position depends on the movement the roof is to make. The cause can be a damaged or displaced sensor, or something mechanical blocking the roof.
Possible causes
- Damaged hall sensor
- Hall sensor 18 has moved out of position
- Something mechanical is blocking the movement of the roof
What you can do
- 1If fault code CRM-C022 is stored, deal with it first, as this code is not detected while it is present
- 2Read out and clear the fault code, then test the roof and see whether the fault returns
- 3Check that hall sensor 18 is firmly fixed and that the connector is free from oxidation and loose connections
- 4Look for damage to the roof parts that could have moved so that the sensor cannot read the position
- 5If the fault remains after these checks, a workshop should replace hall sensor 18
Symptoms you may notice2
- The sun roof or convertible roof is slow or impossible to open and close
- Warning symbol and text message in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.