NHTSA Complaint #11665576 — 2018 HYUNDAI ELANTRA

I am filing this Vehicle Owner's Questionnaire (VOQ) regarding critical safety defects in my 2018 Hyundai Elantra related to: - Recurrent ignition coil pack failures (3 replacements since 10/2018) - Engine stalling at low speeds (6 incidents since 10/2018) - Dealer refusal to apply TSB 20-01-008H ECM update despite matching symptoms Technical Background: Hyundai Technical Service Bulletin 20-01-008H (February 2020) specifically addresses: - Misfire detection logic flaws in 2018-2019 Elantra 2.0L engines - Required ECM software update (ROM ID AD8SP2AS673D) - Updated ignition coils (P/N 27300-2E601) Safety Incidents: 2025: Stalling event at 25 mph approaching traffic light (no crash) 2021, 2023, 2024: Multiple misfire codes (P0300-P0304) with check engine light Dealer Interactions: - Round Rock Hyundai refused ECM update on 05/2025 claiming "VIN not in campaign" - Round Rock Hyundai refused coil replacements on 05/2025 claiming not under warranty - Service advisor acknowledged stalling/coil failure pattern matches TSB criteria Formal Requests: - Investigate Hyundai's VIN filtering for TSB 20-01-008H applicability Require Hyundai to: - Perform ECM software update per TSB specifications - Replace all coils with updated P/N 27300-2E601 - Reimburse previous coil replacement costs $1700 (6 coils over 7 years) - Open recall investigation for 2018 Elantra ignition systems Attachments available upon request. I authorize NHTSA to share my contact information with Hyundai Motor America. This defect creates unreasonable safety risks through sudden power loss and compromised vehicle control.