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 Troubleshooting: U0420 - 68 (Millimeter Wave Radar) (2025): Notes
DTC U0420-68 : (EPS Control Unit Malfunction)
How to use this service information .
NOTICE:
- Before you troubleshoot, review the How to Troubleshoot - Refer to: How to Troubleshoot the Adaptive Cruise Control (ACC) (Integrated Driver Support System) (2025) or How to Troubleshoot the Adaptive Cruise Control (ACC) (2022 2023 2024) or How to Troubleshoot the Road Departure Mitigation(Integrated Driver Support System) (2025) or How to Troubleshoot the Collision Mitigation Braking System (CMBS) (2022 2023 2024) or How to Troubleshoot the Auto High-Beam (High-Beam Support System) (2022 2023 2024) or How to Troubleshoot the Collision Mitigation Braking System (CMBS) (Integrated Driver Support System) (2025) or How to Troubleshoot the Lane Keeping Assist System (LKAS) (2022 2023 2024) or How to Troubleshoot the Lane Keeping Assist System (LKAS) (Integrated Driver Support System) (2025) or How to Troubleshoot the Road Departure Mitigation (2022 2023 2024) .
- Troubleshoot the following DTCs first, if stored at the same time.
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EPS System [EPS]: Go to the indicated DTC's troubleshooting - Refer to: EPS DTC Troubleshooting Index (2025) or EPS DTC Troubleshooting Index (2022 2023 2024) .
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NOTE: If a DTC is recorded again after it is cleared with the HDS, perform a troubleshooting for the EPS system .
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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.