2012 Hyundai Sonata Service and Repair Manual

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Factory-Grade Data

2012 Hyundai Sonata service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Electrical diagnostics with wiring diagrams
  • Coverage across major systems: engine, transmission/driveline, brakes, steering, suspension, HVAC, and more

Trims covered

  • GL Sedan 4-Door
  • Hybrid Sedan 4-Door
  • Hybrid Premium Sedan 4-Door
  • 2.0T Limited Sedan 4-Door
  • 2.0T Sedan 4-Door
  • GLS Sedan 4-Door
  • SE Sedan 4-Door
  • Limited Sedan 4-Door

Engines covered

  • 2.4L 2359CC l4 GAS DOHC Naturally Aspirated
  • 2.4L 2359CC l4 FULL HYBRID EV-GAS (FHEV) DOHC Naturally Aspirated
  • 2.0L 1998CC 122Cu. In. l4 GAS DOHC Turbocharged

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

2012 Hyundai Sonata Recalls & Complaints

NHTSA #18V93400028/12/2018Component: ENGINE

Hyundai Motor America (Hyundai) is recalling certain 2011-2014 Sonata and 2013-2014 Santa Fe Sport vehicles previously repaired under recall numbers 15V-568 and 17V-226. The high pressure fuel pipe t

Consequence

A fuel leak in the presence of an ignition source can increase the risk of a fire.

Remedy

Hyundai will notify owners, and dealers will inspect and replace the fuel pipe, as necessary, free o

NHTSA #12V35200024/07/2012Component: AIR BAGS:SIDE/WINDOW

Hyundai is recalling certain model year 2012-2013 Hyundai Sonata passenger cars, manufactured from January 24, 2012, through June 21, 2012. The curtain side airbags on these vehicles may inflate with

Consequence

The curtain airbag may inflate without deployment command and increase the risk of injury to occupan

Remedy

Hyundai dealers will notify owners, and dealers will replace the curtain side airbags free of charge

NHTSA #15V75900016/11/2015Component: EXTERIOR LIGHTING:BRAKE LIGHTS:SWITCH

Hyundai Motor America (Hyundai) is recalling certain model 2011-2012 Sonata vehicles. The brake pedal stopper pad can deteriorate allowing the brake light switch plunger to remain extended when the b

Consequence

If the brake light switch plunger does not retract as it should when the brake pedal is not being pr

Remedy

Hyundai will notify owners, and dealers will replace the brake pedal stopper pad with an improved pa

NHTSA #17V15200008/03/2017Component: SEAT BELTS:FRONT:ANCHORAGE

Hyundai Motor America (Hyundai) is recalling certain 2011-2014 Sonata and 2011-2015 Sonata Hybrid vehicles. In the affected vehicles, the seat belt linkages for both front seat belts may detach from

Consequence

In the event of a crash, if the seat belts detach from the anchor pretensioners, it can increase the

Remedy

Hyundai will notify owners and dealers will inspect the connection between the seat belt linkages an

TSB #11032523

The National Highway Traffic Safety Administration (NHTSA) has identified the presence of substandard and dangerous drivers-side airbag inflators manufactured by Jilin Province Detiannuo Automobile Safety System Co., Ltd. (DTN). These infla

TSB #11032522

The National Highway Traffic Safety Administration (NHTSA) has issued an urgent safety advisory regarding dangerous, counterfeit driverside airbag inflators manufactured by Jilin Province Detiannuo Automobile Safety System Co., Ltd. (DTN),

TSB #11027047

A Class Action settlement regarding the TRW Airbag was recently decided. Based on the Class Action, customers are eligible for certain settlement benefits. Please see attached for details. Impacted vehicles are also noted below. For further

TSB #11027046

A Class Action settlement regarding the TRW Airbag was recently decided. Based on the Class Action, customers are eligible for certain settlement benefits. Impacted vehicles are also noted below. For further information regarding settlement

TSB #11027045

Hyundai has settled a class action lawsuit that alleges that certain Hyundai and Kia Class Vehicles (defined below) contain defective ZF-TRW airbag control units (ZF-TRW ACUs) that are vulnerable to a condition called electrical overstress,

TSB #11027035

Upon customer's request ONLY, the Technical Service Bulletin (TSB) 25-01-089H provides the service procedure for installation of a key cylinder reinforcement protector assembly and two anti-theft decals on the front windows. This repair pro

TSB #11027034

In addition to the Anti-Theft software provided under Service Campaign 993 (TSB 24-01-009H-1), a zinc reinforced ignition cylinder protector hardware upgrade is being made available to customers upon request. This supplemental security meas

TSB #11027033

This bulletin provides the service procedure for installation of a key cylinder reinforcement protector assembly and two anti-theft decals on the front windows.

Showing the 8 most recent of 177 technical service bulletins on file with NHTSA.

20240422Component: POWER TRAINCrash reported2 injured

The contact owns a 2012 Hyundai Sonata Hybrid. The contact stated that after parking in the driveway and turning the vehicle off, the husband exited the vehicle and walked around to the passenger side

20170210Component: SERVICE BRAKESCrash reported2 injured

I PURCHASED THE CAR IN JUNE 2014 IT WAS USED AND HAD 38,940 MILES. I'VE HAD TO BUY THREE 3 STARTERS & 1 BATTERY SINCE I BOUGHT IT. THE MECHANIC IN FLORIDA STATED THERE WAS AN ELECTRICAL ISSUE WHICH W

20170210Component: ELECTRICAL SYSTEMCrash reported2 injured

I PURCHASED THE CAR IN JUNE 2014 IT WAS USED AND HAD 38,940 MILES. I'VE HAD TO BUY THREE 3 STARTERS & 1 BATTERY SINCE I BOUGHT IT. THE MECHANIC IN FLORIDA STATED THERE WAS AN ELECTRICAL ISSUE WHICH W

20170210Component: ENGINECrash reported2 injured

I PURCHASED THE CAR IN JUNE 2014 IT WAS USED AND HAD 38,940 MILES. I'VE HAD TO BUY THREE 3 STARTERS & 1 BATTERY SINCE I BOUGHT IT. THE MECHANIC IN FLORIDA STATED THERE WAS AN ELECTRICAL ISSUE WHICH W

20170105Component: ELECTRICAL SYSTEMCrash reported2 injured

THIS VEHICLE HAS HAD ELECTRICAL PROBLEMS FROM THE VERY BEGINNING. AS WELL AS THE HORRIBLE TICKING (CYLINDERS NOT INJECTORS!) MAINLY AT FIRST WAS THE RADIO WOULD GO OUT. WAS NOT EVEN A MONTH AFTER PURC

Showing the 5 most serious of 2265 complaints filed with NHTSA.

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