# Service bulletin 26\-FL\-002H TSB

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11033838
- Published by NHTSA: 2026\-06\-16
- Manufacturer's number: 26\-FL\-002H TSB
- Manufacturer's date: 2026\-06\-03
- NHTSA component: FUEL/PROPULSION SYSTEM

## NHTSA's summary

Some Sonata Hybrid \(DN8 HEV\) vehicles may display a Check Engine light and store one or more of the DTCs listed below due to an abnormal air\-fuel ratio in a specific cylinder. This bulletin provides instructions to update the Engine Control Module \(ECM\) to resolve the air\-fuel ratio logic.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11033838-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11033838-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Fuel system

## Vehicles listed

- 2024 to 2026 HYUNDAI SONATA HYBRID

JSON: [/v1/bulletins/11033838](/v1/bulletins/11033838)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%2026-FL-002H%20TSB&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11033838&vehicle=Service%20bulletin%2026-FL-002H%20TSB)