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MANUFACTURER DOCUMENTATION

Hyundai Elantra

2.0L MPI TLL campaign case.

Documented years: 2017

Match the document’s model, years, engine, market and other conditions. This page does not establish every code the vehicle can display.

Diagnostic guides

Hyundai P0128: when the answer is a thermostat, and when it is software

Compare the 2017 Elantra thermostat campaign with the 2018 Elantra GT and 2019 Veloster 1.6T software campaign before authorizing a repair.

Manufacturer bulletins

The diagnostic guides above cite the supporting manufacturer documents. See the sources below for their scope.

Sources and scope

  1. 18-01-012 — TLL thermostat campaign (April 2018)

    Hyundai Motor America · Checked 2026-10-30

  2. 20-01-036H / campaignT3T

    Hyundai Motor America · Checked 2026-10-30

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