TSB ENG257 — Kia Service bulletin
ENG257 is a service bulletin on file with NHTSA for the Kia Sorento, 2021–2023 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. TECHNICAL SERVICE BULLETIN: ITM REPLACEMENT AND ECM & TCM LOGIC IMPROVEMENT (CA2508) - This bulletin provides information to replace the Integrated Thermal Management Module (ITM) and then upgrade the Engine Control Module ‘ECM’ and (if applicable) the Transmission Control…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years ENG257 names
| Vehicle | Model years |
|---|---|
| Kia Sorento | 2021, 2022, 2023 |
Every document filed under ENG257
| Document ID | Filed | Type |
|---|---|---|
| TSB_ENG257 | December 8, 2025 | Service bulletin |
What ENG257 covers
Engine — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB ENG257?
ENG257 is a service bulletin filed with NHTSA by Kia, covering the Kia Sorento across the 2021–2023 model years. NHTSA's summary reads: TECHNICAL SERVICE BULLETIN: ITM REPLACEMENT AND ECM & TCM LOGIC IMPROVEMENT (CA2508) - This bulletin provides information to replace the Integrated Thermal Management Module (ITM) and then upgrade the Engine Control Module ‘ECM’ and (if applicable) the Transmission Control…
Which vehicles does ENG257 cover?
NHTSA's file names Kia Sorento (2021–2023). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB ENG257 a recall, and is the repair free?
No. ENG257 is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of ENG257?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under ENG257, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under ENG257. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.