TECHNICAL SERVICE BULLETIN: SERVICE ACTION: ACCELERATION LOGIC IMPROVEMENT (ECU & TCU) (SA490) - This bulletin provides the procedure to update the software logic of the Engine Control Unit (ECU) and Transmission Control Unit (TCU) on some 2022MY Sorento (MQ4a) vehicles produced from August 11, 2021 through November 29, 2021 and Telluride (ON) vehicles produced from June 8, 2021 through November 4, 2021, which may exhibit rough shift and hesitation during acceleration.
