2021-2023 Toyota Mirai Driving Mode Switch: Function, Diagnosis, and Replacement
Diagnose an unresponsive driving mode selector on your second-generation Mirai and understand why a used OEM switch is the best replacement.
- This switch has no common reported failures, recalls, or TSBs for the 2021-2023 Mirai, indicating high reliability.
- Replacement is extremely easy (Difficulty 1/5) and requires only a plastic trim tool, making it an ideal DIY job.
- Always verify your part number before buying a replacement. The primary number is 84720-62010, but 84720-62040 may also be compatible.
- A used OEM switch is a cost-effective and reliable alternative to an expensive new dealer part, as aftermarket versions are not made.
Symptoms of a Failing Driving Mode Switch
While widespread failures of this specific switch on the 2021-2023 Mirai are not commonly reported, problems with similar switches on other modern vehicles point to a few key symptoms. Failure is more likely to be electronic or from physical wear rather than a major mechanical issue.
- Unresponsive Button: The most common symptom is pressing the switch and having nothing happen. The mode does not change, and no indicator light appears on the dashboard. This could be due to an internal failure in the switch itself or a loose connector.
- Stuck in One Mode: The vehicle may become stuck in Normal, Eco, or Sport mode, and the switch will not allow you to select a different one. This can be frustrating if you are stuck in Eco mode and need more power, or stuck in Sport mode and want better efficiency.
- Intermittent Operation: The switch may work sometimes but not others. This can be caused by worn internal contacts or a developing electronic fault.
- Physical Damage: The button's surface may become worn, cracked, or sticky from use or spills. While this may only be a cosmetic issue at first, it can lead to the button mechanism failing entirely.
Pro Tip: Before assuming the switch is bad, perform a simple vehicle reset. Power the Mirai completely off, wait a few minutes, and power it back on. Sometimes a simple software glitch can cause unresponsiveness, and a power cycle can resolve it.
Known Issues, TSBs, and Recalls
As of mid-2026, there are no specific Technical Service Bulletins (TSBs) or safety recalls issued by Toyota or the NHTSA for the driving mode switch on the 2021-2023 Toyota Mirai. While the vehicle has been subject to other minor recalls and service campaigns, such as for skid control ECU software, none have involved this particular switch. The lack of specific reports indicates that the switch is not a common failure point for this vehicle.
Buying a Used Driving Mode Switch
Since this part is primarily electronic and has a low failure rate, a used OEM switch from a low-mileage vehicle is a smart and cost-effective choice. Aftermarket options are not available for this component, making used OEM the only alternative to a new part from the dealer.
What to Check Before Buying:
- Verify the Part Number: The most critical step is to match the part number. The primary number for 2021-2023 models is 84720-62010. The number 84720-62040 is listed for 2024+ models but may be a compatible superseding part. Always check the number on your original switch before purchasing a replacement.
- Inspect the Connector: Look at the electrical connector on the back of the switch. The pins should be straight, clean, and free of any corrosion or signs of water damage.
- Check for Physical Condition: Ensure the button has a clean, tactile 'click' and isn't mushy or stuck. Check that the graphics are not worn off and there are no cracks, deep scratches, or sticky residue from spills.
- Source Vehicle Mileage: If possible, choose a part from a vehicle with the lowest possible mileage. Since it's a component that gets physically used, lower mileage means less wear.
Warning: Do not confuse this switch with part number 64720-62010, which is a trunk trim panel for the first-generation Mirai. The part numbers are similar but the parts are completely different.
Cost Comparison
Below is an estimated cost breakdown for replacing the driving mode switch. Prices can vary by supplier and location.
| Part Type | Estimated Cost |
|---|---|
| New OEM | $80 - $120 |
| Used OEM | $40 - $75 |
| New Aftermarket | Not Available |
| Shop Labor | $50 - $100 |
Installation Guide
Replacing the driving mode switch is a straightforward task suitable for DIYers with basic tools.
- Difficulty: 1/5 (Very Easy)
- Estimated Time: 15-20 minutes
- Tools Needed: Plastic trim removal tool
Step-by-Step Replacement
- Safety First: Ensure the vehicle is completely powered off.
- Pry Up the Switch Panel: Using a plastic trim removal tool to prevent scratching the console, carefully pry up the edges of the trim piece containing the driving mode switch. It is held in by clips.
- Disconnect the Switch: Once the panel is loose, lift it up to access the underside. Locate the electrical connector attached to the back of the switch. Press the release tab on the connector and pull it straight out.
- Remove the Old Switch: The switch is likely held into the trim panel with small clips. Gently release these clips and push the old switch out of the panel.
- Install the New Switch: Snap the new (or used) switch into place in the trim panel, ensuring it is secure.
- Reconnect and Test: Plug the electrical connector firmly into the new switch until it clicks. Before snapping the trim panel back into place, power on the vehicle to the 'READY' state and test the switch to confirm it cycles through all modes correctly.
- Reassemble: Once you've confirmed it works, align the trim panel with the opening in the console and press down firmly until all the clips snap back into place.
Frequently Asked Questions
Do I need to reprogram my Mirai after replacing the driving mode switch?
No. The driving mode switch is a simple input device. No special programming or calibration is required after replacement. It is a plug-and-play component.
Is it safe to drive with a broken driving mode switch?
Yes, it is generally safe. However, you will be stuck in whichever mode was last active. If you are stuck in Eco mode, you may find acceleration to be sluggish, which could be a consideration when merging onto a highway.
What is the difference between part numbers 84720-62010 and 84720-62040?
Part number 84720-62010 is the original part specified for 2021-2023 models. Part number 84720-62040 is listed for 2024 and newer models but has been seen on used 2023 vehicles, suggesting it may be a later revision or a fully interchangeable part. The safest approach is to match the number from your existing part.
Can a spilled drink cause the driving mode switch to fail?
Yes. Since the switch is located on the center console, it is vulnerable to liquid spills. Sugar from sodas or coffee can make the button sticky and eventually seep into the electronics, causing a short circuit or corrosion that leads to failure.
Technical Specifications
OEM Part Numbers: 84720-62010 84720-62040
Located on the center console. Controls Normal, Eco, and Sport driving modes via electronic signal.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Toyota Mirai: