Hyundai · Known Issues
2018 Hyundai Elantra Problems: 12 Known Issues
2018 model year · 912+ owner reports · Updated September 2026
2018 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
2018 model year · 912+ owner reports · Updated September 2026
2018 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 912+ owner reports, the 2018 Hyundai Elantra has 12 documented known issues, with 3 rated critical. The most serious are Electronic Power Steering System Failure ($800-$3,200 repair), Theft Vulnerability — Missing Engine Immobilizer ('Kia Boyz' / TikTok Challenge) and P0016 — Crank/Cam Correlation (Bank 1 Sensor A) from Clogged OCV or Stretched Timing Chain ($150-$1,300 repair). The most commonly reported issue is Electronic Power Steering System Failure with 567 owner reports. Across all issues with published estimates, repair costs range from $50 to $3,200. DIY maintenance guides at au7o.io.
ENGINE
Hyundai Motor America (Hyundai) is recalling certain 2019-2020 Elantra, 2019-2021 Kona and Veloster vehicles equipped with 2.0L Nu MPI engines. The piston oil rings may not have been properly heat-treated, which could result in engine damage.
WHEELS:LUGS/NUTS/BOLTS/STUDS
Hyundai Motor America (Hyundai) is recalling certain 2019 Ioniq Hybrid and 2020 Elantra vehicles. The right-side rear wheel lug nuts may have been insufficiently tightened, allowing the wheel to detach from the vehicle.
SUSPENSION:FRONT:CONTROL ARM:LOWER BALL JOINT
Hyundai Motor America (Hyundai) is recalling certain 2020 Elantra vehicles. The lower control arm ball joint fasteners may have been insufficiently tightened allowing the ball joint to detach from the lower control arm.
SEAT BELTS:FRONT
Hyundai Motor America (Hyundai) is recalling certain 2021 Elantra, Elantra HEV, Venue, Genesis GV80 and 2022 Genesis GV70 vehicles. In the event of a crash, the front driver-side and/or passenger-side seat belt pretensioner(s) may explode upon deployment.
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.
+ 6 more recalls. Check all on NHTSA.gov
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According to Au7o's analysis of 912+ owner reports, the 2018 Hyundai Elantra has 12 documented issues. The most frequently reported are: Electronic Power Steering System Failure, Theft Vulnerability — Missing Engine Immobilizer ('Kia Boyz' / TikTok Challenge), P0016 — Crank/Cam Correlation (Bank 1 Sensor A) from Clogged OCV or Stretched Timing Chain. Of these, 3 are rated critical and should be addressed promptly.
The 2018 Hyundai Elantra has 12 known issues documented across 912+ owner reports. 3 issues are rated critical: Electronic Power Steering System Failure and Theft Vulnerability — Missing Engine Immobilizer ('Kia Boyz' / TikTok Challenge) and P0016 — Crank/Cam Correlation (Bank 1 Sensor A) from Clogged OCV or Stretched Timing Chain. 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 Elantra issues range from $0 to $3,200, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Electronic Power Steering System Failure, typically costs $800-$3,200 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The electronic power steering (EPS) system fails due to a rubber star damper gear inside the steering column that deteriorates. This causes steering play of up to one inch before wheels respond, making the vehicle difficult to control. Over 200,000 vehicles were recalled for torq… Repairs typically run $800-$3,200. Severity: high.
Hyundai identifies certain 2011-2022 Elantra vehicles with traditional turn-key ignitions and without engine immobilizers as affected by theft methods that bypass the vehicles' security features. Vehicles with push-button start or an immobilizer indicator are not in this software… Severity: high.
P0016 means the intake camshaft position no longer correlates with the crankshaft position within the allowed window. On the Elantra's CVVT engines the two dominant causes are (1) a clogged/stuck Oil Control Valve (OCV/CVVT solenoid) — its internal screen loads up with sludge fro… Repairs typically run $150-$1,300. Severity: high.
Panoramic sunroofs in Hyundai Elantras have spontaneously shattered while driving, often described as sounding like a gunshot. Broken glass falls into the cabin, creating safety hazards. A class action settlement provided an extended 10-year/120,000-mile warranty for shattered su… Repairs typically run $800-$1,500. Severity: medium.
Hyundai TSB 21-AT-013H covers certain 2017-2018 Elantra Sport 1.6L Turbo and Elantra 1.4L Turbo vehicles equipped with the 7-speed dual-clutch transmission. The bulletin states that these vehicles may exhibit abnormal vibration at low speeds and provides a GDS clutch-judder inspe… Severity: medium.
P0011 sets when the intake camshaft is more advanced than the PCM commanded (or the CVVT system won't respond correctly). On the Elantra this is most often a stuck/clogged intake Oil Control Valve (CVVT solenoid): the valve's fine internal screen plugs with oil varnish/sludge, so… Repairs typically run $120-$400. Severity: medium.
Elantras run in road-salt regions suffer a consistent rear brake problem: the rear caliper piston and the caliper slide pins corrode and stop retracting, so the pads stay in light contact with the rotor. The tell-tale is rear pads wearing out faster than fronts - the reverse of t… Repairs typically run $250-$900. Severity: medium.
The Elantra Sport's 1.6L Gamma T-GDI is a direct-injection-only engine: no fuel ever washes across the back of the intake valves, so oil vapour drawn in through the PCV system bakes onto the valve stems and seats. Owners on the Elantra Sport community report visible deposits by r… Repairs typically run $450-$1,200. Severity: medium.
Elantras fitted with a sunroof route water that gets past the glass seal into four corner drains and down tubes inside the A-pillars and rear pillars. On cars parked under trees the corner drains silt up with pollen, leaf debris and dirt, and the tubes themselves can pull off the… Repairs typically run $0-$600. Severity: medium.
On the Elantra's inline-4 (Beta II 2.0L in 2007-2010, Nu 2.0L in 2011+), P0171 means fuel trims have gone too positive because unmetered air is entering the engine. The classic Elantra trigger is a vacuum leak — most often a hardened/cracked PCV hose or a leaking intake-manifold… Repairs typically run $50-$450. Severity: medium.
P0420 on the Elantra means the downstream (post-cat) oxygen sensor sees the catalytic converter no longer scrubbing efficiently. On the 2017-2020 Nu 2.0L engine this frequently is not just an aged cat — it is a symptom of the well-documented Nu 2.0L piston-ring/oil-consumption de… Repairs typically run $300-$1,800. Severity: medium.
Hyundai TSB 26-BD-002H covers certain 2015-2016 Elantra UD and 2017-2018 HMMA-built Elantra ADa vehicles finished in Quartz White Pearl paint code W8 or WW8. White paint may peel or bubble on metal body panels including the hood, fenders, roof, doors, quarter panels and trunk. Pl… Severity: low.
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.