VOLVO
SAS-0018 - Steering wheel position signal R4. Signal too low. Intermittent fault
System
Steering Angle Sensor (SAS)
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?
Steering wheel position signal R4 reads too low. The fault is intermittent: it has occurred at some point but may not be active right now. The cause may be poor connections, a break, a short to ground, or a faulty SAS element.
Possible causes
- Poor contact or oxidation in connections or connectors
- Open circuit
- Short circuit to ground
- Defective SAS element
What you can do
- 1Clear the code and road test the car to see whether it returns
- 2Check that the connectors at the sensor are firmly seated, clean and free from oxide
- 3Follow the wiring from the sensor and look for breaks, chafing and pinched sections
- 4With a multimeter, check that no wire from the sensor is short-circuited to the body (ground)
- 5While the fault is present, stability control is off, so have a workshop repair it promptly
Symptoms you may notice3
- Anti-spin warning lamp is on
- Stabilising function absent
- Anti-spin does not work
What the fault can affect2
- Stability control disconnected
- Anti-spin function blocked
General guidance for car owners. Diagnosis on the car can point to a different cause.