2001-2025 model years · 8,392+ owner reports · Updated September 2026
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According to Au7o's analysis of 8,392+ owner reports, the 2001-2025 Hyundai Sonata has 31 documented known issues, with 13 rated critical. The most serious are Theta II Engine Seizure/Failure ($0-$8,000 repair), Front Radar / Forward Collision-Avoidance Warning Disabled by Sensor or Calibration Faults ($250-$2,200 repair), Hybrid Starter Generator (HSG) Bearing/Pulley Failure Causing Belt Noise and No-Start ($900-$2,200 repair), MDPS / Electronic Power Steering (EPS) sudden assist loss and steering lockup ($0-$1,500 repair), Front Seat Belt Linkage Detaching From Anchor Pretensioner ($0-$0 repair), High-Pressure Fuel Pipe Leak After Theta II Engine Replacement (Recall-on-a-Recall) ($0-$600 repair), ABS/HECU Module Internal Brake Fluid Leak Causing Electrical Short and Engine Compartment Fire ($0-$1,400 repair), Eight-Speed Wet DCT Electric Oil Pump Failure Causing Total Loss of Drive (DN8) ($0-$5,500 repair), Electric Power Steering (EPS) Failure, P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain (Theta II 2.4L GDI) ($500-$2,000 repair), No Engine Immobilizer on Turn-Key Trims Enabling USB-Cable Theft ($0-$900 repair), Theta II 2.0T/2.4L GDI connecting-rod bearing failure (knock, stall, fire) ($4,000-$8,000 repair) and P0420 — Bank 1 Catalytic Converter Failure from Theta II 2.4L GDI Oil Consumption ($900-$2,500 repair). The most commonly reported issue is Theta II Engine Seizure/Failure with 5,632 owner reports. Across all issues with published estimates, repair costs range from $20 to $8,000. DIY maintenance guides at au7o.io.
EXTERIOR LIGHTING:BRAKE LIGHTS
Hyundai Motor America (Hyundai) is recalling certain 2024 Hyundai Sonata vehicles. The software for the brake lights may cause the brake lights to flash and not illuminate properly. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 108, "Lamps, Reflective Devices, and Associated Equipment."
FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS
Hyundai Motor America (Hyundai) is recalling certain 2021-2022 Santa Fe and Sonata vehicles equipped with 2.5L turbocharged engines. Fuel may leak at the pipe connection between the high-pressure fuel pump and fuel rail.
VISIBILITY:WINDSHIELD
Hyundai Motor America (Hyundai) is recalling certain 2020-2021 Santa Fe, 2021 Sonata, and Elantra vehicles. During manufacturing, the windshield may not have been properly bonded to the vehicle, allowing it to detach in a crash.
POWER TRAIN:AUTOMATIC TRANSMISSION
Hyundai Motor Company (Hyundai) is recalling certain 2021-2022 Santa Fe, Sonata, Veloster N, 2022 Santa Cruz, Elantra N, and Kona N vehicles. The vehicle's "fail-safe" limited-mobility drive mode may be impaired, when prompted by a transmission oil pump malfunction, which can result in a complete loss of drive power.
FUEL SYSTEM, GASOLINE
Hyundai Motor America (Hyundai) is recalling certain 2020-2023 Sonata vehicles. A damaged check valve can allow air to enter the fuel tank, causing it to expand and contact hot exhaust components, melting the tank.
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According to Au7o's analysis of 8,392+ owner reports, the 2001-2025 Hyundai Sonata has 31 documented issues. The most frequently reported are: Theta II Engine Seizure/Failure, Front Radar / Forward Collision-Avoidance Warning Disabled by Sensor or Calibration Faults, Hybrid Starter Generator (HSG) Bearing/Pulley Failure Causing Belt Noise and No-Start. Of these, 13 are rated critical and should be addressed promptly.
The 2001-2025 Hyundai Sonata has 31 known issues documented across 8,392+ owner reports. 13 issues are rated critical: Theta II Engine Seizure/Failure and Front Radar / Forward Collision-Avoidance Warning Disabled by Sensor or Calibration Faults and Hybrid Starter Generator (HSG) Bearing/Pulley Failure Causing Belt Noise and No-Start and MDPS / Electronic Power Steering (EPS) sudden assist loss and steering lockup and Front Seat Belt Linkage Detaching From Anchor Pretensioner and High-Pressure Fuel Pipe Leak After Theta II Engine Replacement (Recall-on-a-Recall) and ABS/HECU Module Internal Brake Fluid Leak Causing Electrical Short and Engine Compartment Fire and Eight-Speed Wet DCT Electric Oil Pump Failure Causing Total Loss of Drive (DN8) and Electric Power Steering (EPS) Failure and P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain (Theta II 2.4L GDI) and No Engine Immobilizer on Turn-Key Trims Enabling USB-Cable Theft and Theta II 2.0T/2.4L GDI connecting-rod bearing failure (knock, stall, fire) and P0420 — Bank 1 Catalytic Converter Failure from Theta II 2.4L GDI Oil Consumption. 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.
Repair costs for known Hyundai Sonata issues range from $0 to $8,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Theta II Engine Seizure/Failure, typically costs $0-$8,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
Reliability varies across model years of the Hyundai Sonata. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2001-2025 Hyundai Sonata with 31 documented issues documented across 8,392+ owner reports.
The Theta II engine can seize due to metal debris blocking oil flow to connecting rod bearings. Hyundai issued recalls and extended warranties. Affected engines may need replacement. Repairs typically run $0-$8,000. Severity: high.
Owners have reported the Forward Safety system, Smart Cruise Control, and related ADAS features becoming unavailable with warning messages such as front radar blocked or forward safety system disabled. In some cases the problem appears after minor front-end work, bumper cover rep… Repairs typically run $250-$2,200. Severity: high.
The Sonata Hybrid uses a belt-driven Hybrid Starter Generator in place of a conventional starter and alternator. The HSG's bearing wears and its pulley can loosen on the shaft, which first shows up as a squeal, chirp or abnormal noise plus belt wear, then escalates to a hybrid sy… Repairs typically run $900-$2,200. Severity: high.
The Motor-Driven Power Steering (MDPS) unit can fail, illuminating the EPS warning light and causing sudden loss of power assist or a steering wheel that becomes very tight/hard to turn - sometimes during low-speed maneuvers (parking, tight turns) and sometimes at highway speed (… Repairs typically run $0-$1,500. Severity: high.
On YF-generation Sonatas built at Hyundai Motor Manufacturing Alabama, the front seat belt linkage is pressed onto the anchor pretensioner connector during assembly after the pretensioner is already bolted to the sill. If the connector did not fully latch on the line, the belt ca… Repairs typically run $0-$0. Severity: high.
This is a failure created by the Theta II engine replacement work itself, not by the original engine defect. On Sonatas whose engines were swapped under the earlier Theta II campaigns (15V-568 and 17V-226), the high-pressure fuel pipe joining the pump outlet to the fuel rail was… Repairs typically run $0-$600. Severity: high.
The Hydraulic Electronic Control Unit (HECU) of the anti-lock brake system can leak brake fluid internally past degraded motor shaft seals and O-rings onto the module's printed circuit board. The contaminated board shorts and draws excessive current, which can ignite an engine co… Repairs typically run $0-$1,400. Severity: high.
On the DN8 Sonata the electric oil pump inside the eight-speed wet dual-clutch transmission can fail abruptly, collapsing internal oil pressure. The transmission's limited-mobility fail-safe mode is impaired when the failure is triggered this way, so instead of degrading to a red… Repairs typically run $0-$5,500. Severity: high.
NHTSA recall 16V-190 (Hyundai recall 143) covers certain model-year 2011 Sonata sedans. Damage to the electronic-power-steering control-unit circuit board can illuminate the EPS warning lamp and cause loss of steering assist. The filing states that the vehicle reverts to a manual… Severity: high.
On the 2010-2015 Sonata with the 2.4L Theta II GDI engine, P0016 (Crankshaft/Camshaft Position Correlation, Bank 1 Sensor A) most often signals a stretched timing chain or a worn/failing chain tensioner, letting the intake cam fall out of sync with the crank. Poor oil flow and so… Repairs typically run $500-$2,000. Severity: high.
Sonatas built without a push-button start system were sold in the US without an engine immobilizer, meaning the starter and ignition can be operated with a stripped steering column and a USB plug rather than a coded key. The technique was spread on TikTok from 2021 by the 'Kia Bo… Repairs typically run $0-$900. Severity: high.
The Theta II GDI engine (2.4L MPI/GDI and 2.0T) suffers premature connecting-rod bearing wear. NHTSA determined that metal debris left from crankshaft machining, plus uneven crankpin surface roughness, restricts oil flow to the rod bearings, raising bearing temperatures and causi… Repairs typically run $4,000-$8,000. Severity: high.
On the 2011-2019 Sonata with the 2.4L Theta II GDI engine, P0420 (Catalyst Efficiency Below Threshold, Bank 1) is frequently a downstream symptom of the engine's well-documented excessive oil consumption. As worn rod bearings/rings let the engine burn oil, phosphorus and other co… Repairs typically run $900-$2,500. Severity: high.
Sonatas equipped with the dual-clutch transmission can experience shuddering, hesitation, and jerky engagement at low speeds. The DCT can feel rough in stop-and-go traffic. This is a characteristic of the dry-clutch DCT design. Repairs typically run $0-$2,500. Severity: medium.
The A/C compressor can fail, particularly on vehicles in hot climates with heavy A/C use. Internal compressor failure can contaminate the A/C system. Clutch and bearing failures are also common. Repairs typically run $500-$1,400. Severity: medium.
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.
Hyundai TSB 25-FL-001H covers specified production ranges of model-year 2021-2023 Sonata vehicles equipped with the 2.5-liter GDI Theta III non-turbo engine. Some affected vehicles may store one or more misfire DTCs due to GDI injectors leaking internally; the bulletin says inter… Severity: medium.
P0430 (Catalyst Efficiency Below Threshold, Bank 2) applies only to the V6 Sonata, which has two catalyst banks. On the 2006-2010 Sonata 3.3L Lambda V6 the bank 2 warm-up catalytic converter degrades so the downstream O2 sensor tracks the upstream sensor too closely, indicating t… Repairs typically run $500-$2,500. Severity: medium.
P0174 (System Too Lean, Bank 2) only applies to the V6 Sonata, since the four-cylinder has a single bank. On the 2.7L Delta (2005) and 3.3L Lambda (2006-2010) V6, this code most often appears alongside P0171 and points to a shared, centrally located vacuum leak — most commonly a… Repairs typically run $250-$650. Severity: medium.
On Sonatas equipped with the panoramic sunroof, the wind-deflector anchor plate can be insufficiently bonded; if the deflector partially detaches while the roof is open it can interfere with the closing panel and cause the glass sunroof panel to detach from its mounting tabs and… Repairs typically run $0-$1,500. 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.
