2003 Hyundai Sonata Problems: 1 Known Issue

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2003 Hyundai Sonata has 1 documented issue. None of the listed issues is rated critical; this is not a complete reliability assessment. Across all issues with published estimates, repair costs range from $90 to $450. DIY maintenance guides at au7o.io.

All 1 Known Issue

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On the 2001-2010 Hyundai Sonata, on the EF and NF Sonata the crankshaft position sensor degrades thermally: the car starts and runs fine cold, then stalls once the engine reaches full operating temperature and refuses to restart for five to fifteen minutes until the sensor cools, after which the cycle repeats and eventually becomes a permanent no-start. It is one of the most repeated complaints on the EF and NF sub-forums. A closely related contributor on these cars is the engine wiring harness that runs from the firewall over the valve cover and down behind the power steering pump bracket - the insulation is well known for embrittling and falling away, so a car that keeps failing after a new sensor usually has a chafed sensor circuit rather than a bad sensor. This is a Sirius/Delta and Theta I era failure and should not be confused with the later Theta II GDI stall-from-rod-knock pattern, which is accompanied by knocking and metal in the oil.

This issue also affects: Hyundai Entourage, Kia Forte, Kia Optima

Common Symptoms

Engine stalls once warmed up
Cranks but will not start until it cools for 5-15 minutes
Intermittent stalling while driving
Restarts and runs briefly then dies again
Eventually a permanent no-start
Poor fuel economy before failure

How to Fix

Replace the crankshaft position sensor (typically $30-90 for the part; on the 2.7L V6 access is behind the timing cover area and labor is higher than on the 4-cylinder). Before condemning the sensor a second time, unwrap and inspect the harness section over the valve cover and behind the power steering pump bracket for cracked or missing insulation and repair the sensor circuit. Confirm with a scan tool that the crank signal drops out at the moment of stall - a camshaft position sensor or failing ignition-side component produces similar symptoms. No recall exists; this is normal-wear replacement.

Typical repair cost:$90 - $450

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Community Reported

Low ConfidenceVerifiedReviewed Aug 2026

NHTSA Recalls12 recalls

SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP

Hyundai Motor America (Hyundai) is recalling certain 2006-2011 Hyundai Azera and 2006 Hyundai Sonata vehicles. Water may enter the Anti-lock Brake (ABS) Module and result in an electrical short .

Campaign #18V02600009/01/2018

SUSPENSION:REAR

Hyundai is recalling certain model year 2006-2010 Sonata vehicles manufactured March 1, 2005, through January 21, 2010; and model year 2006-2011 Azera vehicles manufactured September 27, 2005, through November 22, 2010 originally sold in, or currently registered in, 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 and water can enter portions of the rear crossmember, leading to corrosion of the crossmember steel. This may lead to detachment of one of the rear control arms.

Campaign #13V35400012/08/2013

EXTERIOR LIGHTING:BRAKE LIGHTS:SWITCH

Hyundai Motor Company (Hyundai) is recalling certain model year 2006-2009 Accent, model year 2007-2011 Azera, Sonata and Sante Fe,2006-2011 Tucson, 2009-2011 Elantra Touring, 2007-2010 Elantra, 2008-2011 Veracruz, 2009-2011 Genesis, 2010-2011 Genesis Coupe, 2007-2008 Entourage, and 2006-2008 Tiburon vehicles. Originally, in April 2013, Hyundai recalled 1,059,824 model year 2007-2009 Accent and Tucson, model year 2007-2010 Elantra, model year 2007-2011 Santa Fe, model year 2008-2009 Veracruz, model year 2010-2011 Genesis Coupe, and model year 2011 Sonata vehicles. In September 2013, Hyundai informed the agency that it was adding more vehicles to this campaign, representing an additional 652,512 units. The total number of vehicles being recalled is now 1,712,336. In the affected vehicles, the stop lamp switch may malfunction. A malfunctioning stop lamp switch may cause the brake lights to not illuminate when the brake pedal is depressed or may cause an inability to deactivate the cruise control by depressing the brake pedal. Additionally, a malfunctioning stop lamp switch may also result in intermittent operation of the push-button start feature, affect the operation of the brake transmission shift interlock feature, preventing the shifter from being moved out of the PARK position and cause the Electronic Stability Control (ESC) malfunction light to illuminate.

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Frequently Asked Questions

What are the most common Hyundai Sonata problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2003 Hyundai Sonata has 1 documented issue. The documented issue is: Crankshaft Position Sensor Heat-Soak Failure Causing Hot Stall and Extended No-Start (EF/NF). None are rated critical, but regular maintenance is recommended.

Is the Hyundai Sonata reliable?

The 2003 Hyundai Sonata has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

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

Repair costs for known Hyundai Sonata issues range from $90 to $450, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2001-2010 Hyundai Sonata Crankshaft Position Sensor Heat-Soak Failure Causing Hot Stall and Extended No-Start (EF/NF)?

On the EF and NF Sonata the crankshaft position sensor degrades thermally: the car starts and runs fine cold, then stalls once the engine reaches full operating temperature and refuses to restart for five to fifteen minutes until the sensor cools, after which the cycle repeats an… Repairs typically run $90-$450. Severity: medium.

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.