What does fault code SAS-U001000 mean?

Diagnostic fault code details for SAS-U001000 (Volvo XC90 (2003–), Volvo XC90 (2003–), Volvo XC90 (2003–)). Repair service at OBD Tuning.

VOLVO

SAS-U001000 - Medium speed CAN communication bus. General fault information. No information about the type of fault.

System

Steering Angle Sensor (SAS)

Volvo models this fault code applies to

Applies to the following models:

1 model

XC90 (2003–)

Show models by year and engine (5)

What does this fault code mean?

Although the code is named medium speed CAN, it applies to serious interference on the high speed network that blocks CAN communication. The cause may be a short or open circuit in the CAN wiring, or an internal fault in the sensor or in another control module on the same part of the network. The steering angle sensor then shuts itself off.

Possible causes

Short circuit between the CAN wires.
Open circuit in one of the CAN wires.
Internal fault in the steering angle sensor (SAS).
Internal fault in another control module on the same part of the CAN network.

What you can do

1Check that the battery is charged and the fuses are intact. Low voltage can disturb communication between the control modules.
2Clear the code, start the engine and check whether it returns. If it comes back, the fault has not been fixed.
3With a diagnostic tool, read the fault codes in the other control modules. If several show communication faults, the fault is probably in the network.
4The angle sensor is part of the stability system. Have a workshop do the measurements and fault tracing rather than working on the steering wheel yourself.

Symptoms you may notice1

No noticeable symptoms for the driver

What the fault can affect1

The sensor shuts itself off (bus-off)

General guidance for car owners. Diagnosis on the car can point to a different cause.