2003 Hyundai Sonata Service and Repair Manual

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Factory-Grade Data

2003 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
  • Base Sedan 4-Door
  • GLS Sedan 4-Door
  • LX Sedan 4-Door

Engines covered

  • 2.4L 2351CC l4 GAS DOHC Naturally Aspirated
  • 2.7L 2656CC V6 GAS DOHC Naturally Aspirated

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

2003 Hyundai Sonata Recalls & Complaints

NHTSA #04V36900026/07/2004Component: FUEL SYSTEM, GASOLINE:STORAGE

CERTAIN PASSENGER VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 301, "FUEL SYSTEM INTEGRITY" A VALVE ON THE FUEL TANK ASSEMBLY MAY NOT CLOSE PROPERLY. IF

Consequence

FUEL SPILLAGE IN THE PRESENCE OF AN IGNITION SOURCE MAY RESULT IN A FIRE.

Remedy

DEALERS WILL INSTALL AN ADDITIONAL FUEL TANK ASSEMBLY VALVE. THE RECALL BEGAN ON OCTOBER 5, 2004.

NHTSA #09V17100021/05/2009Component: LATCHES/LOCKS/LINKAGES:DOORS:LATCH

HYUNDAI IS RECALLING 91,350 MY 2002-2003 HYUNDAI SONATA VEHICLES. REPEATED USE OF THE INTERIOR DOOR HANDLE MAY CAUSE WEAR OF THE CHROME PLATE. IF THE TOP EDGE OF THE HANDLE HAS VERY THIN CHROME PLAT

Consequence

THIS MAY INFLICT LACERATION INJURIES TO ANYONE USING THE DOOR HANDLE.

Remedy

DEALERS WILL REPAIR THE CHROME PLATED INTERIOR DOOR HANDLE FREE OF CHARGE. THE RECALL IS EXPECTED T

NHTSA #03V09700017/03/2003Component: TIRES:TEMPORARY/EMERGENCY SPARE TIRE

ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH A TRACTION CONTROL SYSTEM (TCS), IF THE T125/70D-15 COMPACT SPARE TIRE IS INSTALLED ON A FRONT WHEEL POSITION, THE TCS MAY INADVERTENTLY ACTIVATE BEGINNING

Consequence

INADVERTENT ACTIVATION OF THE TCS WILL CAUSE AUTOMATIC APPLICATION OF THE BRAKE AT THE WHEEL WHERE T

Remedy

DEALERS WILL REPLACE THE SPARE TIRE WITH A NEW LARGER DIAMETER T125/80R-15 COMPACT SPARE TIRE AND A

NHTSA #09V12400016/04/2009Component: SUSPENSION

HYUNDAI IS RECALLING 188,282 MY 2001-2004 SONATA AND MY 2001-2004 XG300 AND XG350 VEHICLES ORIGINALLY SOLD IN OR CURRENTLY REGISTERED IN THE STATES OF CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, IOWA, M

Consequence

IF THAT HAPPENS, THE VEHICLE MAY LOSE DRIVE POWER TO THE WHEELS, AND THE FRONT WHEEL MAY MAKE CONTAC

Remedy

DEALERS WILL MEASURE THE THICKNESS OF THE FRONT SUB-FRAME AND INSPECT THE FRONT SUB-FRAME FOR CORROS

NHTSA #04V17800009/04/2004Component: FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY

SOME PASSENGER VEHICLES CONTAIN A FUEL TANK ASSEMBLY VALVE THAT MAY NOT CLOSE PROPERLY. IF A VEHICLE WITH A FUEL TANK ASSEMBLY VALVE THAT IS NOT PROPERLY CLOSED WERE TO ROLL OVER, FUEL SPILLAGE MAY

Consequence

FUEL SPILLAGE IN THE PRESENCE OF AN IGNITION SOURCE MAY RESULT IN A FIRE.

Remedy

DEALERS WILL INSTALL AN ADDITIONAL FUEL TANK ASSEMBLY VALVE. OWNER NOTIFICATION BEGAN ON JUNE 30, 2

NHTSA #09V31700007/08/2009Component: LATCHES/LOCKS/LINKAGES:DOORS:LATCH

HYUNDAI IS RECALLING 82 MODEL YEAR 2002-2003 SONATA VEHICLES. REPEATED USE OF THE INTERIOR DOOR HANDLE MAY CAUSE WEAR OF THE CHROME PLATING. IF THE TOP EDGE OF THE HANDLE HAS VERY THIN CHROME PLATING

Consequence

A SHARP EDGE COULD LACERATE OR OTHERWISE INJURE A VEHICLE OCCUPANT.

Remedy

DEALERS WILL REPAIR THE CHROME PLATED INTERIOR DOOR HANDLE FREE OF CHARGE. THE RECALL BEGAN ON SEPTE

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 #11025476

This bulletin provides information regarding condensation related to the accumulated moisture in the headlamp, rear combination lamp, daytime running lamp (DRL), or fog lamp. This TSB illustrates the various causes of condensation inside th

TSB #10251285

This bulletin contains information about the proper removal of the windshield wiper blade protective cover on all models. If the protective cover is not removed correctly, there is a possibility of the rubber insert and rail spring becoming

TSB #10247189

This bulletin provides important checkpoint guidelines when performing engine oil and filter change services.

TSB #10235566

Hyundai applies a Paint Protection Film (PPF) on new vehicles before delivery to dealerships. It provides a barrier between the paint and contaminants, such as rail dust, acid rain, and industrial fallout. In rare cases, the paint can becom

TSB #10230904

This bulletin provides information regarding condensation related to the accumulated moisture in the headlamp, rear combination lamp, daytime running lamp (DRL), or fog lamp. This TSB illustrates the various causes of condensation inside th

TSB #10217258

Effective June 2, 2008, Federal Motor Vehicle Safety Standard 110 (FMVSS 110) established a threshold for correcting load carrying capacity information indicated on tire placards when vehicle weight has been increased before retail sale. Th

Showing the 8 most recent of 76 technical service bulletins on file with NHTSA.

20150225Component: AIR BAGSCrash reported2 injured

WE WERE INVOLVED IN AN ACCIDENT AND NONE OF THE AIRBAGS PROPERLY DEPLOYED IT ONLY FELL OUT OF THE SEAT ON THE PASSENGER SIDE OF THE CAR AND IT DEPLOYED FLAT NO AIR IN IT OR NOTHING. MY FIANCEE WAS INJ

20141219Component: AIR BAGSCrash reported2 injured

TWO DAYS AFTER MY GRANDMOTHER PURCHASED A 2003 HYUNDAI SONATA, SHE WAS INVOLVED IN A MINOR ACCIDENT. THE CAR WAS TRAVELING AT 45 MPH WHEN IT REAR ENDED ANOTHER VEHICLE. THE AIRBAG NEVER DEPLOYED AND A

20051114Component: AIR BAGS:FRONTALCrash reported2 injured

WHILE DRIVING SOUTH ON US68, AN ONCOMING NORTHBOUND CONCRETE TRUCK TURNED DIRECTLY IN FRONT OF US. WHEN WE HIT, THE PASSENGER'S SHOULDER HARNESS OF MY 2003 HYUNDAI SONATA FAILED TO "LOCK". I WAS THR

20051114Component: SEAT BELTS:FRONTCrash reported2 injured

WHILE DRIVING SOUTH ON US68, AN ONCOMING NORTHBOUND CONCRETE TRUCK TURNED DIRECTLY IN FRONT OF US. WHEN WE HIT, THE PASSENGER'S SHOULDER HARNESS OF MY 2003 HYUNDAI SONATA FAILED TO "LOCK". I WAS THR

20050909Component: AIR BAGS:FRONTALCrash reported2 injured

CAR STOPPED IN FRONT OF US TO TURN LEFT WITH NO BRAKE LIGHTS AND NO BLINKER. WHEN WE REALIZED HE WAS STOPPED WE IMMEDIATELY HIT THE BRAKES. THE SURFACE (CONCRETE) ON THE BRIDGE WAS SLICK AND DID NOT A

Showing the 5 most serious of 247 complaints filed with NHTSA.

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