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Service bulletins for the 2012 Hyundai Sonata

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

230 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
5NP-M7Z5K-022019-02-19. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information on how to return a Hyundai HEV/PHEV/EV/Fuel Cell Lithium Battery for proper disposal and safe environmental recycling using Hyundai?s authorized vendor Kinsbursky Brothers Inc. (KBI).
5NP-W4W6L-012019-02-19. Service bulletin. ELECTRICAL SYSTEM. Hyundai is conducting a product improvement campaign to enhance the knock sensor software to detect abnormal engine bearing noise before potentially severe engine damage occurs. If abnormal engine bearing noise is detected, the Malfunction Indicator Lamp (MIL) will blink continuously, a chime will sound on certain vehicles, and the vehicle will be placed in Limp Home Mode allowing the customer to drive to the nearest Hyundai dealer for diagnosis and repair. In addition, DTC P132600 will be recorded in the ECM. The vehicle can continue to be operated for a limited time in Limp Home Mode, but it will accelerate slower and have a reduced maximum speed. Engine RPMs will be limited to approximately 1800-2000 RPM.
5NP-L6Z7X-012019-02-19. Service bulletin. ELECTRICAL SYSTEM. Hyundai has launched a Product Improvement Campaign to perform a knock sensor software update on the subject vehicles. This campaign is being implemented to ensure the satisfaction of Hyundai customers. The software update installs a newly developed Knock Sensor Detection System (KSDS) that detects vibrations indicating the onset of excessive connecting rod bearing wear in the engine. The KSDS is designed to alert a vehicle driver at an early stage of bearing wear before the occurrence of engine damage. If vibrations caused by bearing wear start to occur, the Malfunction Indicator Lamp (MIL) will blink continuously, an audible chime will sound, and the vehicle will be placed in Limp Home Mode. At that time, Diagnostic Trouble Code (DTC) P132600, specific to the KSDS, will be recorded in the ECM. The vehicle can continue to be operated for a limited time in Limp Home Mode, but it will accelerate slowly and have a reduced maximum speed with RPMs limited to approximately 1800-2000 RPM.
5NP-S6S9Z-122018-12-17. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides information related to a BMS (Battery Management System) ECU software update that must be performed after replacing a high voltage Lithium Battery in a Sonata HEV (YF HEV) or Tucson Fuel Cell Electric Vehicle (LM FCEV).
5NP-A5H5K-112017-11-14. Service bulletin. ELECTRICAL SYSTEM. If you are servicing a Sonata Hybrid with any of the warning messages or comments listed below, follow the Service Procedure to diagnose the condition. ? Hybrid Warning Message was illuminated ? Dash displayed a message: ?Check Hybrid System, Turn off engine? ? Diagnostic Trouble Code P0705 ? Transmission range sensor circuit
5NP-E2C3Q-092017-09-14. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This bulletin provides information on how to return a Hyundai HEV/PHEV/EV/Fuel Cell Lithium Battery for proper disposal and safe environmental recycling using Hyundai?s authorized vendor Kinsbursky Brothers Inc. (KBI).
5NP-V6G6F-102016-10-18. Service bulletin. ENGINE; ELECTRICAL SYSTEM:SOFTWARE. "THIS BULLETIN PROVIDES INFORMATION RELATED TO THE ENGINE CONTROL MODULE (ECM) SOFTWARE UPDATE TO PREVENT AN INCREASE IN THE CATALYST TEMPERATURE WHICH MAY RESULT IN ILLUMINATION OF THE MALFUNCTION INDICATOR LIGHT WITH THE FOLLOWING DTC(S): H P0171 - SYSTEM TOO LEAN - BANK 1. H P0420 - CATALYTIC CONVERTER SYSTEM, BANK 1 - EFFICIENCY BELOW THRESHOLD. IN RARE CASES, THERE CAN BE A REDUCTION IN ENGINE POWER IF THE CATALYST IS RESTRICTED."
5NP-M6C8D-102016-10-14. Service bulletin. ELECTRICAL SYSTEM:STARTER ASSEMBLY. THIS BULLETIN DESCRIBES THE PROCEDURE TO VERIFY THAT THE FUSE AND JUMPER SETTINGS FOR THE REMOTE ENGINE START CONTROL MODULE ARE SET FOR THE APPLICABLE VEHICLE, AND IF NECESSARY, HOW TO MAKE ADJUSTMENTS TO THESE SETTINGS.
5NP-E9K5G-092016-09-29. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; ELECTRICAL SYSTEM:SOFTWARE. THIS BULLETIN PROVIDES INFORMATION RELATED TO THE TCU AND HCU SOFTWARE UPDATE FOR CERTAIN 2011~15 SONATA HYBRID (YF-HEV) VEHICLES WITH IMPROVED 100 MESH SOLENOIDS. THESE UPDATES MUST BE PERFORMED FOR THE PART NUMBERS SHOWN BELOW ONLY AFTER THE TRANSMISSION HAS BEEN REPLACED.
16-AT-002-12016-07-14. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. TCU & HCU UPDATE – 2011~15 MY SONATA HYBRID (YF HEV) Description: This bulletin provides information related to the TCU and HCU software update for certain 2011~15 Sonata Hybrid (YF-HEV) vehicles with improved 100 mesh solenoids. These updates must be performed for the part numbers shown below only after the transmission has been replaced. If the update is not completed, the transmission may experience a small shift flare or delayed shift.
13-01-0422016-05-23. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
14-BE-0022016-05-19. Service bulletin. ELECTRICAL SYSTEM. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
14-BE-0122016-03-31. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
13-01-0422016-03-31. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
TSB-14-HC-0022014-10-30. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. HYUNDAI: SOME VEHICLES EXPERIENCE NOT MOVING FROM STOP OR GASOLINE ENGINE NOT TURN ON, CHARGING WARNING LIGHT ON, INSTRUMENT CLUSTER DISPLAY WARNING SAFELY STOP AND DO NOT DRIVE, NO EV READY MODE OR READY LIGHT BLINKS ON/OFF. MODEL 2011-2014 SONATA (YF HEV). *PE UPDATED 3/31/15. *PE
TSB-13-AT-0082013-06-18. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; ELECTRICAL SYSTEM:STARTER ASSEMBLY:SOLENOID. HYUNDAI: INFORMATION HAS BEEN PROVIDED REGARDING PROCEDURE IN REPAIRING AND REPLACING RELATED PART TO TRANSMISSION SOLENOID DTC FOR CERTAIN VEHICLES. MODELS 2010-2013 TUCSON, SANTA FE, 2011-2013 SONATA, ELANTRA, AZERA, 2012-2013 ACCENT, 2013 VELOSTER. *PE

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.