DTC P1631-81: Communication Error from ECM to VSC Invalid Serial Data Received [09/2020 - ]: Procedure

1. Check for vehicle stability control system DTCs.

   Chassis > Brake/EPB > Trouble Codes 

   Result

   Result	Proceed to
   Vehicle stability control system DTCs are not output	A
   Vehicle stability control system DTCs are output	B

Result: 

B 

GO TO VEHICLE STABILITY CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2020 - ] 

Result: 

A 

See step  2

1. Clear the DTCs.

   Powertrain > Radar Cruise1 > Clear DTCs 

2. Make sure that the DTC detection conditions are met.

   HINT: 

   If the detection conditions are not met, the system cannot detect the malfunction.

3. Check for DTCs.

   Powertrain > Radar Cruise1 > Trouble Codes 

   Result

   Result	Proceed to
   DTC P1631-81 is not output	A
   DTC P1631-81 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 09/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2022 - ] 

Result: 

B 

REPLACE ECM 

for 8AR-FTS: Refer to REMOVAL [08/2015 - ]

for 2GR-FKS: Refer to REMOVAL [10/2017 - ]