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Hyundai · Known Issues

2003 Hyundai XG350 Problems: 4 Known Issues

2003 model year · 150+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 150+ owner reports, the 2003 Hyundai XG350 has 4 documented known issues, with 1 rated critical. The most serious is Timing Belt Tensioner Failure (3.5L Sigma V6) ($500-$1,200 repair). The most commonly reported issue is Power Steering Pump Failure and Line Leaks with 150 owner reports. Across all issues with published estimates, repair costs range from $150 to $1,200. DIY maintenance guides at au7o.io.

In This Article

  • XG350 Engine2
  • XG350 Suspension1
  • XG350 Electrical1
  • Recalls3
  • FAQ
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In This Article

  • Engine2
  • Suspension1
  • Electrical1
  • Recalls3
  • FAQ

All 4 Known Issues

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ALL YEARS20052004200320022001

On the 2001-2005 Hyundai XG350 3.5L Sigma V6, the 3.5L Sigma V6 engine in the XG350 uses a timing belt with a hydraulic tensioner that can fail, allowing the belt to lose tension. The tensioner bearing can seize or the hydraulic damper can leak, both leading to belt slack and potential timing jump. The Sigma V6 is an interference engine, so a timing belt failure or jump causes catastrophic engine damage. Hyundai recommends timing belt replacement at 60,000-mile intervals, but many XG350 owners defer this service due to cost.

Common Symptoms

  • Squealing or chirping from timing cover area
  • Engine vibration and rough idle
  • Check engine light with timing codes
  • Ticking noise from front of engine
  • Sudden engine failure if belt jumps or breaks

How to Fix

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Gates PowerGrip timing-belt component kit with water pump
    OEMGates TCKWP323

    Confirm VIN/engine and separately ide

    PartsGeek

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$500 - $1,200

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence

On the 2002-2005 Hyundai XG350 3.5L V6, the 3.5L V6 intake manifold gaskets deteriorate causing vacuum leaks, rough idle, and lean running conditions. Upper plenum gasket is most common failure point. Can trigger multiple misfire codes.

Common Symptoms

  • Rough idle
  • Lean misfire
  • Hissing noise from engine
  • Check engine light
  • Poor acceleration

How to Fix

Replace upper and lower intake manifold gaskets. Clean manifold mating surfaces. Inspect PCV system and vacuum hoses while manifold is removed. Use OEM gaskets for best seal.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Fel-Pro lower and upper intake-manifold gasket set
    OEMFel-Pro MS 96460

    complete upper/lower intake sealing set after smoke testing confirms manifold-gasket leakage Fitment/availability: Fel-Pro MS 96460 is cataloged as a lower-and-upper intake-manifold gasket set for 2002-2005 Hyundai XG350 3.5L V6. Confirm…

    PartsGeek

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$250 - $500

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence
Community reported
150 owners

On the 2002-2005 Hyundai XG350, the XG350's power steering pump develops internal wear causing whining noise and eventual loss of assist. The high-pressure lines also develop leaks at the crimp fittings. Hot weather and full-lock steering accelerate pump wear.

Common Symptoms

  • Whining when turning
  • Heavy steering
  • Power steering fluid leaking
  • Fluid spraying on engine
  • Groaning at full lock
  • Steering assist intermittent

How to Fix

Replace the power steering pump and inspect all lines. Replace any lines with wet fittings or visible corrosion. Flush the system with fresh power steering fluid and bleed all air from the system.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Aisin new power-steering pump with pulley
    OEMAisin SPK-018

    complete pump replacement after hydraulic testing confirms pump failure Fitment/availability: Aisin SPK-018 is cataloged for 2002-2005 Hyundai XG350 and cross-references OE 57100-39000; it is a new pump with pulley but without reservoir …

    PartsGeek

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Owner tips & cautions

  • TipAvoid holding the steering at full lock for more than a few seconds — this overloads the pump and causes premature failure
Typical repair cost:$200 - $600

Research This Issue

Based on 150 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence150 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026

On the 2002-2005 Hyundai XG350, power window regulators use a cable-driven design that is prone to cable breakage, causing the window to drop into the door or jam in a partially open position. Front windows fail most frequently.

Common Symptoms

  • Window drops into door
  • Window moves slowly
  • Clicking sound from door
  • Window stuck open or closed

How to Fix

Replace window regulator assembly (motor and regulator sold as unit). Lubricate window channel guides with silicone spray. Check door wiring harness for chafing.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Genuine Hyundai front-left power-window regulator
    OEMHyundai 82403-39000

    driver-front regulator-only replacement after cable/mechanism failure is confirmed Fitment/availability: Hyundai 82403-39000 is the front-left regulator for 2002-2005 XG350. It does not include the motor; confirm door position, VIN and o…

    HyundaiPartsDeal
  • Genuine Hyundai front-right power-window regulator
    OEMHyundai 82404-39000

    passenger-front regulator-only replacement after cable/mechanism failure is confirmed Fitment/availability: Hyundai 82404-39000 is the front-right regulator for 2002-2005 XG350. It does not include the motor; confirm door position, VIN a…

    HyundaiPartsDeal
  • Genuine Hyundai rear-left power-window regulator
    OEMHyundai 83403-39000

    driver-rear regulator-only replacement after cable/mechanism failure is confirmed Fitment/availability: Select the exact Hyundai 83403-39000 left regulator line. It is cataloged for XG300/XG350 and does not include the motor; confirm 200…

  • Genuine Hyundai rear-right power-window regulator
    OEMHyundai 83404-39000

    passenger-rear regulator-only replacement after cable/mechanism failure is confirmed Fitment/availability: Hyundai 83404-39000 is the rear-right regulator for 2002-2005 XG350. It does not include the motor; confirm door position, VIN and…

    HyundaiPartsDeal

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$150 - $350

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence
NHTSA Recalls3 recalls

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, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, WEST VIRGINIA, WISCONSIN, AND THE DISTRICT OF COLUMBIA. ROAD SALT APPLIED IN THESE JURISDICTIONS DURING THE WINTER MONTHS MAY RESULT IN PROGRESSIVE, INTERNAL CORROSION OF THE FRONT SUB-FRAME ON THE VEHICLES, AND MAY RESULT IN THINNING OR PERFORATION OF THE SUB-FRAME STEEL. THE CORROSION IS FREQUENTLY VISIBLE AND OFTEN DISCOVERED DURING INSPECTION OR ROUTINE MAINTENANCE, AND OWNERS MAY ALSO HEAR NOISES OR NOTICE TIRE MISALIGNMENT AND STEERING PULL. IF THESE SIGNALS ARE UNDETECTED OR UNHEEDED, THE CORROSION MAY PROGRESS AND THE FORWARD MOUNTING OF THE LOWER CONTROL ARM MAY DETACH FROM THE SUB-FRAME.

Campaign #09V12400016/04/2009

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 A VEHICLE ROLLS OVER AND THE FUEL TANK ASSEMBLY VALVE IS NOT PROPERLY CLOSED, FUEL SPILLAGE MAY OCCUR.

Campaign #04V36900026/07/2004
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Frequently Asked Questions

What are the most common Hyundai XG350 problems?

According to Au7o's analysis of 150+ owner reports, the 2003 Hyundai XG350 has 4 documented issues. The most frequently reported are: Timing Belt Tensioner Failure (3.5L Sigma V6), Power Steering Pump Failure and Line Leaks, Intake Manifold Gasket Leak. Of these, 1 is rated critical and should be addressed promptly.

Is the Hyundai XG350 reliable?

The 2003 Hyundai XG350 has 4 known issues documented across 150+ owner reports. 1 issue is rated critical: Timing Belt Tensioner Failure (3.5L Sigma V6). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Hyundai XG350 problems?

Repair costs for known Hyundai XG350 issues range from $150 to $1,200, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Timing Belt Tensioner Failure (3.5L Sigma V6), typically costs $500-$1,200 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2001-2005 Hyundai XG350 Timing Belt Tensioner Failure (3.5L Sigma V6)?

The 3.5L Sigma V6 engine in the XG350 uses a timing belt with a hydraulic tensioner that can fail, allowing the belt to lose tension. The tensioner bearing can seize or the hydraulic damper can leak, both leading to belt slack and potential timing jump. The Sigma V6 is an interfe… Repairs typically run $500-$1,200. Severity: high.

What is the 2002-2005 Hyundai XG350 Power Steering Pump Failure and Line Leaks?

The XG350's power steering pump develops internal wear causing whining noise and eventual loss of assist. The high-pressure lines also develop leaks at the crimp fittings. Hot weather and full-lock steering accelerate pump wear. Repairs typically run $200-$600. Severity: medium.

What is the 2002-2005 Hyundai XG350 Intake Manifold Gasket Leak?

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data sourced from 150+ owner reports, NHTSA recalls, TSBs, and automotive forums.

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 OCCUR.

Campaign #04V17800009/04/2004

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

The 3.5L V6 intake manifold gaskets deteriorate causing vacuum leaks, rough idle, and lean running conditions. Upper plenum gasket is most common failure point. Can trigger multiple misfire codes. Repairs typically run $250-$500. Severity: medium.

What is the 2002-2005 Hyundai XG350 Power Window Regulator Cable Snap?

Power window regulators use a cable-driven design that is prone to cable breakage, causing the window to drop into the door or jam in a partially open position. Front windows fail most frequently. Repairs typically run $150-$350. Severity: low.