Theta III 2.5L t-gdi ECM misfire detection logic improvement (SA654)

Bulletin number

TSB_ENG269 (SA654)

Component

Engine

Summary

TECHNICAL SERVICE BULLETIN: SERVICE ACTION: THETA III 2.5L T-GDI ECM MISFIRE DETECTION LOGIC IMPROVEMENT (SA654) - This bulletin provides information to upgrade the ‘ECM’ system software on certain 2024-2026MY Sorento (MQ4a) vehicles equipped with a 2.5L T-GDI SULEV engine produced from December 5, 2023 through May 29, 2026, which may may exhibit an illuminated malfunction indicator lamp (MIL) related to cold-start misfire detection. To address this condition, the Engine Control Module (ECM) software has been updated with revised cold-start misfire diagnostic threshold logic. There is no drivability issue associated with this condition.

Owners of these vehicles have filed 27 complaints in the engine category.