DTC U0423-81: Invalid Data Received from Instrument Panel Cluster Control Module Invalid Serial Data Received [07/2020 - 10/2022]: Procedure

1. Check for DTCs.

   Body Electrical > Combination Meter > Trouble Codes 

   HINT: 

   If DTC U0423-81 is output by the dynamic radar cruise control system, perform troubleshooting for the meter/gauge system.

   Result

   Result	Proceed to
   Meter / gauge system DTCs are not output	A
   Meter / gauge system DTCs are output	B

Result: 

A 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [07/2020 - 10/2022] 

Result: 

B 

GO TO METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ]