Code No. U0126: SAS CAN Timeout

  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
  • When the steering wheel sensor is replaced, calibrate the steering wheel sensor (Refer to GROUP 35C - On-vehicle Service )).


ACC/FCM-ECU communicates with the steering wheel sensor via the CAN bus lines.


This diagnosis code is set when the abnormality below is detected:



STEP 1. M.U.T.-III CAN bus diagnostics.

Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?

Go to Step 2
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).

STEP 2. M.U.T.-III other system diagnosis code.

Check the ASC diagnosis code (Refer to GROUP 35C - Troubleshooting ).

Q. Is the diagnosis code set?

Perform the relevant troubleshooting.
Go to Step 3

STEP 3. M.U.T.-III other system diagnosis code.

Check if the diagnosis code No. U0126 is set to other ECU.

Q. Is diagnosis code set?

Replace the steering wheel sensor (Refer to GROUP 35C - Steering Wheel Sensor ).
Go to Step 4

STEP 4. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.U0126 set?

Replace the ACC/FCM-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).