Hyundai service campaign 9C5
What it saysCertain Kona Electric (OS EV) and Ioniq Electric (AE EV) vehicles are eligible for a Battery Management System (BMS) software update. NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service campaign dated Sep 9, 2026, received Aug 21, 2026, about the electrical system — 4 documents under this number: 9C5 OL, 26-01-065H DCS, 26-01-065H TSB, 26-01-065H DN. It names 8 model years (2019–2023). A service campaign is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
Certain Kona Electric (OS EV) and Ioniq Electric (AE EV) vehicles are eligible for a Battery Management System (BMS) software update. This update to the BMS software improves the system's diagnostic capability. Follow Technical Service Bulletin (TSB) 26-01-065H to complete the BMS software update.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 9C5 OL | Service campaign | Sep 9, 2026 | 11037293 | PDF, 164 KB |
| 26-01-065H DCS | Service campaign | Aug 17, 2026 | 11036686 | PDF, 44 KB |
| 26-01-065H TSB | Service campaign | Aug 14, 2026 | 11036311 | PDF, 409 KB |
| 26-01-065H DN | Service campaign | Aug 13, 2026 | 11036685 | PDF, 519 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 8 model years this bulletin names have filed 877 complaints with NHTSA since 2015. 243 of them name Electrical System, Fuel/Propulsion System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
6/17/2024 12 volt battery was dead; EV was fully charged 6/16/2024 using Level 2 charger in my home garage. AAA charged the battery; I drove to Crossroads Hyundai Loveland, CO and asked to have the converter to the main battery checked; this was not done. Crossroads checked the battery via CADEX with "good battery charge" as result.
2020 Hyundai Kona · Electrical System · filed with NHTSA Feb 10, 2025 · ODI 11641724
VEHICLE SAFETY HAZARD: ACTIVE HIGH-VOLTAGE ISOLATION FAULT (DTC P0AA6) WITH DECEPTIVE DEALER/MANUFACTURER BYPASS & CONCEALMENT. On April 15, 2026, the dealer scanned my 2021 Ioniq EV and uncovered DTC P0AA6 (Hybrid/EV Battery Voltage System Isolation Fault), which denotes a catastrophic high-voltage leak into the chassis.
2021 Hyundai Ioniq · Electrical System · filed with NHTSA Jul 16, 2026 · ODI 11750854
The contact owns a 2019 Hyundai Kona. The contact stated that the battery warning light was illuminated. The contact stated he continued to drive to his destination with the warning light illuminated. The contact took the vehicle to the local dealer and the mechanic was unable to determine the cause of the failure.
2019 Hyundai Kona · Electrical System · filed with NHTSA Aug 16, 2021 · ODI 11429272
In depth: 2019 Hyundai Kona electrical problems →
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the electrical system
Source: same model, same component group31 other manufacturer communications filed against these Hyundai models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Hyundai list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 26-GI-003H | Service bulletin | Oct 27, 2026 | This bulletin provides information related to the navigation and head unit software changes introduced in the 2026 2nd Navigation Map and So… |
| 26-GI-002H | Service bulletin | May 27, 2026 | This bulletin provides information related to the navigation and head unit software changes introduced in the 2026 1st Navigation Map and So… |
| 9C0 | Service campaign | Apr 8, 2026 | Some vehicles may exhibit a loss of connectivity or interruptions in the middle of using Bluelink functions. This may be due to an occasiona… |
| P33 | Other | Dec 19, 2025 | In response to this trend, we engineered a software upgrade that addresses the social media theft method and made it available to owners of… |
| 25-01-089H | Other | Dec 15, 2025 | In addition to the Anti-Theft software provided under Service Campaign 993 (TSB 24-01-009H-1), a zinc reinforced ignition cylinder protector… |
| 25-BE-020H | Service bulletin | Sep 30, 2025 | This bulletin provides information related to the changes introduced in the 2025 1st Navigation Map and Software Update. The changes may var… |
| TBW | Service campaign | Jul 9, 2025 | A software update is available for multiple vehicles equipped with either Display Audio 2.0V or the AVN 5th Gen Wide system. |
| 25-BE-013H | Service bulletin | Jun 14, 2025 | Certain vehicles with the Connected Car Navigation Cockpit (ccNC) Lite units may exhibit connection issues with Bluetooth and wireless phone… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Hyundai, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Hyundai 9C5 a recall?
No. A service campaign is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 9C5 repair free?
A service campaign is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does 9C5 cover?
The manufacturer filed it against 8 model years: 2021 Hyundai Ioniq, 2020 Hyundai Ioniq, 2019 Hyundai Ioniq, 2023 Hyundai Kona, 2022 Hyundai Kona, 2021 Hyundai Kona and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: 2019 -2023MY Kona Electric (OS EV): built 28 Aug 2018 – 26 Jul 2023; 2020 -2021MY Ioniq Electric (AE EV): built 1 Nov 2019 – 17 May 2021 — the build date is on the certification label in the driver’s door jamb.