Genesis bulletin 26-HA-002G
What it saysSome Genesis vehicles (listed below) equipped with Lambda-III 3.5T-GDI engines may exhibit reduced heater performance due to engine coolant deposits clogging the heater core. NHTSA’s full summary ↓
Genesis filed this with NHTSA as a service bulletin dated Jun 10, 2026, received Jun 16, 2026, about the engine — 1 document under this number: 26-HA-002G TSB. It names 18 model years (2021–2026). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
Get the next Genesis bulletin for your model by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
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.
Some Genesis vehicles (listed below) equipped with Lambda-III 3.5T-GDI engines may exhibit reduced heater performance due to engine coolant deposits clogging the heater core. This bulletin provides instructions to verify the concern and to replace the front and rear heater core (if applicable).
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 26-HA-002G TSB | Service bulletin | Jun 10, 2026 | 11033845 | PDF, 1,556 KB |
What the document itself lists
The manufacturer titles it “REDUCED HEATER PERFORMANCE – TEMPERATURE CHECK &”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 97138-T1000QQH | — | — | |
| 97138-T4000QQH | — | — | |
| 97138-AR000QQH | — | — | |
| 97138-T6000QQH | — | — | |
| 97138-T6300QQH | — | — | |
| 97138-T6500QQH | — | — | |
| 00232-19098WAR | Pink Coolant | — | eBay Motors → |
| 85815-C1100 | — | — | |
| 82315-2W000 | — | — | |
| 82315-2P000 | All Models Steering Wheel | — | eBay Motors → |
| 56115-B1000 | All Models Evaporator Core | — | eBay Motors → |
| 97141-4H900 | O-Ring | 2 | eBay Motors → |
Read by machine from the document NHTSA serves (12 pages), read Sep 29, 2026. A part number is shown only where it matches Genesis’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
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.
Email me new Genesis bulletins for one of these models
A weekly email, sent only in a week when Genesis files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 18 model years this bulletin names have filed 487 complaints with NHTSA since 2015. 86 of them name Engine — 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.
I moved to Reno, NV where I need to merge onto route 80 everyday. During several attempts to merge onto 80, my Genesis GV70 stopped accelerating at 42 MPH, roughly 5000 RPMs and I was almost rear ended on two occasions because of the 'stalling' of the vehicle. An 18 wheel truck almost hit me because I couldn't accelerate past 42 MPH.
2024 Genesis GV70 · Engine · filed with NHTSA Feb 14, 2026 · ODI 11717992
The contact owns a 2025 Genesis GV70. The contact stated that while on the highway driving at 55 MPH, the vehicle suddenly stopped. There were no warning lights illuminated. The vehicle was restarted. The vehicle was towed to the local dealer, but they were unable to determine the failure. The vehicle was not diagnosed or repaired.
2025 Genesis GV70 · Engine · filed with NHTSA May 18, 2026 · ODI 11738458
I was driving down the interstate at 70 mph when my gas pedal stopped responding and the car was slowing down. Suddenly the car started beeping at me saying the engine was shut off and I needed to put it into park or neutral immediately. This happened a week prior on a 45 mph road and I was able to restart the car with no issues.
2022 Genesis GV70 · Engine · filed with NHTSA Aug 23, 2023 · ODI 11540239
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 engine
Source: same model, same component group11 other manufacturer communications filed against these Genesis models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Genesis list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LA18 | Warranty extension | Jul 30, 2026 | Certain 2026MY G70 (IK) and 2027MY G80 (RG3) vehicles may exhibit a water-flowing or gurgling noise from the front center air vents during e… |
| L18G | Warranty extension | Jul 30, 2026 | Certain 2026MY G70 (IK) and 2027MY G80 (RG3) vehicles may exhibit a water-flowing or gurgling noise from the front center air vents during e… |
| 26-EE-003G | Service bulletin | Apr 18, 2026 | Some vehicles may exhibit difficulty starting in cold weather. This bulletin provides the procedure to perform an inspection on the starter… |
| 26-EM-008G | Service bulletin | Mar 2, 2026 | Some GV70 (JK1A) vehicles equipped with 2.5T engines may display a check engine light with DTC P04F000… |
| 914G | Service campaign | Nov 13, 2025 | This notice is being sent to you as our records indicate you may have previously received an important Service Campaign notice for Genesis C… |
| 916G | Service campaign | Oct 17, 2025 | Certain GV70 (JK1A) vehicles equipped with 3.5 T-GDI Lambda III engines may exhibit a malfunction indicator light with DTC P26CB00… |
| 914G OL | Service campaign | Sep 20, 2025 | Genesis has become aware that some vehicles may illuminate the Check Engine Light indicator as a result of detected engine misfires. |
| 24-EE-016G | Service bulletin | Dec 20, 2024 | Some 2025MY GV80 (JX1) vehicles may exhibit battery performance degradation due to 12 V battery discharge, affecting customer satisfaction.… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Genesis, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Genesis 26-HA-002G a recall?
No. A service bulletin 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 26-HA-002G repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Hyundai warranty extension on file lists the ones Hyundai has filed.
Which vehicles does 26-HA-002G cover?
The manufacturer filed it against 18 model years: 2025 Genesis G80, 2024 Genesis G80, 2023 Genesis G80, 2022 Genesis G80, 2021 Genesis G80, 2025 Genesis G90 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: built 25 Jul 2020 – 15 Feb 2025; 2023 – 2025 G90 (RS4): built 21 Apr 2022 – 21 Feb 2025; 2022 – 2026 GV70 (JK1): built 10 Mar 2021 – 20 Mar 2025 — the build date is on the certification label in the driver’s door jamb.