Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC B1798: Yaw Rate Sensor Module Malfunction; DTC B1799: Vehicle Stability Control ECU Malfunction [12/2019 - 11/2023]: Procedure
- CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)
- Check for electronically controlled brake system DTCs.
for Gasoline Model: Refer to DTC CHECK / CLEAR [12/2019 - ]
for HV Model: Refer to DTC CHECK / CLEAR [12/2019 - ]
OK
DTCs are not output.
Result
Proceed to OK NG
Result:
NG
GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM
for Gasoline Model: Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2022] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 11/2023]
for HV Model: Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023]
Result:
OK
See step 2
- Check for electronically controlled brake system DTCs.
- CHECK CAN COMMUNICATION SYSTEM
- Using the GTS, check if the CAN communication system is functioning normally.
OK
CAN communication system is functioning normally.
HINT:
Refer to Communication Bus Check in CAN Communication System.
for Gasoline Model: Refer to DIAGNOSIS SYSTEM [12/2019 - 09/2020] , or refer to DIAGNOSIS SYSTEM [09/2020 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 11/2023]
for HV Model: Refer to DIAGNOSIS SYSTEM [12/2019 - 09/2020] , or refer to DIAGNOSIS SYSTEM [09/2020 - 10/2021] , or refer to DIAGNOSIS SYSTEM [10/2021 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 11/2023]
Result
Proceed to OK NG
Result:
NG
GO TO CAN COMMUNICATION SYSTEM
for Gasoline Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 11/2023]
for HV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2021 - 10/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 11/2023]
Result:
OK
See step 3
- Using the GTS, check if the CAN communication system is functioning normally.
- CHECK DTC (HEALTH CHECK)
Result:
OK
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ]
Result:
NG
GO TO OTHER DIAGNOSTIC TROUBLE CODE CHART
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.