Hyundai Elantra 2019–2020 — service campaign
Bulletin 26-01-039H TSB · NHTSA communication 11036202 · issued Aug 6, 2026
Service campaign
communication type
Engine
component
2019–2020
model years
2
vehicle entries
Official summary
Certain Elantra (ADA) vehicles may have been incorrectly updated with Cylinder Noise Detection System (CNDS) software that can set DTC P132700; this software was intended only for Korean-built Elantra (AD) vehicles. This bulletin provides instructions to perform a software update for the Engine Control Module (ECM) to revert to the original ROM ID, apply the emissions label under the hood, and provide the vehicle owner with Proof of Correction.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.