Hyundai Kona Electric battery warning (2018–2020)

Hyundai Kona Electric · 2018–2020 · all trims

Reported symptoms

Battery state of charge limited by software pending battery replacement
'Check Electric Vehicle System' or 'EV system service required' warning
Manufacturer advisory issued recommending parking outdoors or away from structures
Reduced charging speed or charging interruption following BMS (Battery Management System) software update
Range significantly below original WLTP or EPA estimate
Smoke, fire, or thermal event reported (rare but documented in regulatory filings)

Questions to ask

Pose these to the service advisor at intake. Request answers in writing or via email.

Has VIN (Vehicle Identification Number) [VIN] received the full battery replacement, or only the interim BMS software update?
What is the production date of the replacement battery, if installed?
Is the modified BMS software still active on this vehicle, or has it been removed following physical replacement?
What is the current state of charge limit and the battery state of health reading?
Will the high-voltage battery warranty period be reset or extended following replacement, and is this applied automatically or by request?
What recall or service campaign reference number is being applied to this VIN, and is it the regional campaign or a global program?

Documents to request

Each item should be received in writing before authorizing repair work.

Parts invoice showing the part number and production date of the replacement battery
Repair order documenting the battery replacement procedure and any associated components serviced
Written confirmation of the BMS software version installed before and after the visit
Copy of the recall or service campaign reference number applied to the VIN
Battery state of health readout taken at the conclusion of service
Written warranty coverage statement specific to the replacement battery

Pre-service evidence

Capture before drop-off. Once the vehicle leaves your possession, proving prior condition becomes significantly harder.

Photograph cluster warning messages and any state of charge limitation indicators before drop-off
Record the maximum charge percentage achievable on the existing battery prior to replacement
Save copies of all Hyundai and dealer correspondence regarding the recall, including any parking advisories
Note odometer reading at drop-off and at pickup
Record the service center name, the technician's name, and the date the battery replacement was completed
If the vehicle has been towed at any point during the recall period, retain the tow receipt

Service advisor interaction

Operational notes specific to the conversation at the service desk.

Record the full name of the service advisor and the technician performing the work
Note whether the visit is classified as a recall remedy, a service campaign, or a goodwill repair — the classification affects future warranty rights
If the advisor describes the BMS software update as a complete remedy rather than an interim measure, request written clarification, since the documented remedy in most regions includes physical battery replacement
Document any statement attributing the issue to user behavior (charging habits, third-party charging equipment), as such attributions can affect later coverage determinations

Repair authorization

Cautions before signing.

Recall remedies are performed at no charge to the owner; do not authorize any charge for parts or labor associated with the documented recall
If diagnostic fees are presented for issues the dealer claims are unrelated to the recall, request written documentation distinguishing recall-related and unrelated faults before authorization
Hyundai dealer policies vary by region and franchise; if the regional handling differs from the manufacturer's published remedy, request the difference in writing before signing the repair authorization
Repair authorization signatures often include language permitting additional related work — read the document and decline blanket additional work in advance

Post-service verification

Complete before leaving the service location. Issues that surface after departure are operationally harder to attribute to the visit.

Verify the state of charge limit has been removed and the vehicle charges to its expected maximum
Confirm no warning messages on the cluster after a full ignition cycle and a complete charge cycle
Verify the modified BMS software has been removed if a full battery replacement was performed
Confirm range estimate at full charge is consistent with the original specification for the vehicle
Confirm the repair order identifies the recall reference number and the replacement battery part number
Retain a copy of the post-repair battery state of health reading for ongoing reference

Email templates

Documentation-focused templates for service correspondence. Tap copy to use. Subject and body are kept verbatim — paste them as-is into your email client.

pre-service inquiry

to: dealer service

Service inquiry — Kona Electric battery recall, request for written documentation scope

Service Department, I am scheduling my [YEAR] Hyundai Kona Electric, VIN [VIN], for service related to the high-voltage battery recall. Before the visit, I am requesting written confirmation of the following: 1. The current recall and service campaign status for VIN [VIN], including any open and closed campaigns. 2. The scope of the work to be performed during this visit — specifically, whether it consists of a software update, a battery replacement, or a diagnostic-only visit. 3. The expected duration of the service and any loaner vehicle arrangement. 4. Confirmation that recall remedies are at no charge to the owner. Please reply to this email so the planned scope is on record. Thank you, [NAME]

documentation request

to: dealer service

Documentation request — Kona Electric battery service on [DATE], VIN [VIN]

Service Department, Following the service performed on [DATE] for VIN [VIN], I am requesting the following documents for my ownership records: 1. The repair order detailing the work performed. 2. The parts invoice listing the part number and production date of any replaced components. 3. Written confirmation of the BMS software versions installed before and after the visit. 4. The post-repair battery state of health reading. 5. Written confirmation of the warranty coverage period applicable to any replaced components. These documents form part of the vehicle's service record and may be operationally important for any future battery-related service. Please reply to this email at your convenience. Thank you, [NAME]

Warranty notes

Hyundai has issued recall and service campaigns associated with this battery defect cluster across multiple regions. The applicable campaign and remaining warranty period for VIN [VIN] should be confirmed in writing.
Replacement batteries typically carry their own warranty period from installation date, but the duration and conditions vary by region. Confirmation in writing is operationally important.
Vehicles with ongoing state of charge limitations imposed by modified BMS software remain eligible for full physical battery replacement under the recall in most regions; software-only mitigation has not been treated as a complete remedy.
Repairs performed under goodwill rather than warranty do not extend the warranty period. Confirm in writing which classification applies.

Observational patterns

Software-only mitigation has been characterized in some service interactions as a complete remedy. The documented remedy in most regions includes physical battery replacement, and the distinction matters for ongoing coverage and resale documentation.

Regional handling of the recall has varied. Service interactions that contradict published remedies in the owner's region warrant written clarification rather than verbal acceptance.

User behavior, including charging habits and use of non-OEM (Original Equipment Manufacturer) charging equipment, has been cited in some service interactions as a contributing factor. The recall remedy is not contingent on user behavior, and such attributions are relevant only to the extent they affect non-recall components.

Replacement battery part numbers and production dates have varied across the rollout. Documentation of the installed unit's specifications is operationally important for any future warranty discussion.

Linked recalls: hyundai-kona-electric-battery-fire

All rated vehicles