HYUNDAI
25-EM-007H TSB
Manufacturer communications
- Publication date
- 2025-12-18
- Received by NHTSA
- 2026-01-06
- NHTSA record numbers
- 11027036
Manufacturer summary
Original wording in English
Some Elantra (CN7, CN7A), Kona (OS, SX2), and Sonata Hybrid (DN8 HEV) vehicles equipped with 2.0L engines may illuminate a warning lamp for DTC P218100 (Cooling System Performance) related to the Integrated Thermal-Management Module (ITM). Follow the service procedure in this bulletin to install a spring onto the thermostat within the ITM, in order to prevent premature opening, and perform an ECU software update on affected vehicles.
Reported code forms
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
Hyundai
P218100Cooling System PerformanceCheck vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Hyundai | ELANTRA | 2023 |
| Hyundai | ELANTRA | 2022 |
| Hyundai | ELANTRA | 2021 |
| Hyundai | KONA | 2025 |
| Hyundai | KONA | 2024 |
| Hyundai | KONA | 2023 |
| Hyundai | KONA | 2022 |
| Hyundai | SONATA HYBRID | 2023 |
| Hyundai | SONATA HYBRID | 2022 |
| Hyundai | SONATA HYBRID | 2021 |
| Hyundai | SONATA HYBRID | 2020 |