This bulletin provides the procedure to update the Engine Control Module (ECM) and/or the Transmission...

Bulletin number

24-FL-002H

Component

Engine and engine cooling: engine: engine control module (ecu/ECM)

Summary

This bulletin provides the procedure to update the Engine Control Module (ECM) and/or the Transmission Control Module (TCM) for 2020-2023MY Sonata (DN8/DN8a) vehicles to improve operation of the Idle Stop and Go (ISG) system. Under certain circumstances the vehicle may not restart after the ISG system has engaged and requires a manual restart due to the lack of intake manifold pressure recovery.

Owners of these vehicles have filed 122 complaints in the engine category.