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ECU Update became avail June 2013

Every 2011-2012 should get it but you have to complain about hesitation and jerky behavior when the engine is cold. It is a free update that any Hyundai service can perform but some dealers will balk at giving it unless they can duplicate the problem.. It will give you much better performance and many better mpg.

13-FL-004
HEV MULTI-ECU UPDATE – VERSION 2

Description:
This bulletin provides information related to a software update of the following controllers:ECM/TCM/HCU/MCU/AHB/OPU by GDS Event#302, and BMS by Event#303.
This ECU Update will refine vehicle drivability, HEV transaxle shifts, and cruise control.
Applicable Vehicles: 2011-2012MY SONATA (YF) 2.4L Hybrid Electric Vehicle (HEV)


http://www.hyundai-forums.com/229-sonata-yf-hybrid/162191-new-multi-ecu-update.html
 
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