DTC U0420-00: Invalid Data Received From Power Steering Control Module; DTC U0420-82: Invalid Data Received From Power Steering Control Module Alive / Sequence Counter Incorrect / Not Updated: Procedure

1. Using the Techstream, perform the power steering ECU DTC inspection.

   Refer to DTC CHECK / CLEAR

   Chassis > Electronic-Controlled Power Steering > Trouble Codes 

2. Are any DTCs present?

   Result

   Proceed to
   Yes
   No

Result:  2

Yes 

See step  5

Result:  1

No 

See step  2

1. Using the Techstream, clear the DTC from the laser sensor.

   Refer to DTC CHECK / CLEAR

   Chassis > Smart City Brake Support > Clear DTCs 

2. Using the Techstream, perform the laser sensor DTC inspection.

   Refer to DTC CHECK / CLEAR

   Chassis > Smart City Brake Support > Trouble Codes 

3. Is the same DTC present?

   Result

   Proceed to
   Yes
   No

Result:  2

Yes 

See step  4

Result:  1

No 

See step  3

1. Are any DTCs present?

   Result

   Proceed to
   Yes
   No

Result:  1

No 

DTC TROUBLESHOOTING COMPLETED. 

Result:  2

Yes 

GO TO APPLICABLE DTC INSPECTION.. Refer to  DIAGNOSTIC TROUBLE CODE CHART 

1. Verify that the steering angle sensor is equipped, and its wiring harness connects with engine stop and start ECU.

   Refer to REMOVAL

2. Using the Techstream, select the PID item "Steering Wheel Estimated Absolute Angle" for power steering ECU.
3. Verify the monitor value with steering wheel position 0° (vehicle wheels straight-ahead).
   1. If monitor value is +-20° or less, replace the steering column, then go to the next step.

      Refer to REMOVAL

   2. If monitor value is +-20° or more, verify that the pre-collision warning light (amber) blacks out when vehicle is driven for approx. 5 min after the steering angle signal is reset.

      Refer to ENGINE STOP AND START ECU CONFIGURATION (USING AS-BUILT DATA)

4. If the malfunction recurs, replace the steering column, then go to the next step.

   Refer to REMOVAL

   Result

   Proceed to
   NEXT

Result:  1

NEXT 

See step  2

1. Refer to DIAGNOSTIC TROUBLE CODE CHART
2. DTC troubleshooting completed, then go to the next step.

   Result

   Proceed to
   NEXT

Result:  1

NEXT 

See step  1