2015 HYUNDAI SONATA

Typical onset: 70,000-120,000 mi

Symptoms: Metallic knocking from engine bay, especially cold start, Metal shavings in oil during changes, Sudden loss of power or complete seizure without warning, Check engine light with misfire codes P0300-P0304

Fix: Complete engine replacement or rebuild required — connecting rod bearings fail due to manufacturing debris in oiling system. Hyundai extended warranty to 10yr/100k for some VINs but many owners fall outside coverage. Rebuild involves 18-24 labor hours; most shops recommend reman or used engine swap at 12-16 hours to avoid liability.

Estimated cost: $4,500-7,500

Typical onset: 60,000-100,000 mi

Symptoms: Transmission fluid puddling under vehicle, driver side, Harsh shifting or slipping after fluid loss, Pink/red fluid mixing with coolant in overflow tank, Overheating transmission temp warning

Fix: Factory crimped cooler lines crack at fittings where they enter radiator. Replace both pressure and return lines, flush trans and cooling system if cross-contamination occurred. 2.5-3.5 hours labor. If coolant entered trans, expect full transmission rebuild adding $2,500-3,500.

Estimated cost: $400-650

Symptoms: Heavy steering effort without warning, usually at low speeds, Red steering wheel warning light on dash, Grinding noise from column when turning, Complete loss of power assist

Fix: Motor-driven power steering (MDPS) control unit fails internally, covered under recall 17V-224 for some build dates but many units fail outside recall scope. Replacement requires column removal, 3-4 hours labor. Hyundai updated part design in later production.

Estimated cost: $850-1,400

Typical onset: 80,000-130,000 mi

Symptoms: Clunking when shifting from Park to Drive/Reverse, Excessive vibration at idle, especially in Drive, Visible engine movement when revving in Park, Transmission feels like it's 'jumping' during acceleration

Fix: Rear transmission mount (roll restrictor) rubber deteriorates, allowing excessive drivetrain movement. Common wear item but accelerated by aggressive driving. Replace mount and inspect others, 1.5-2 hours labor. OEM mount recommended over aftermarket.

Estimated cost: $250-400

Typical onset: 70,000-110,000 mi

Symptoms: Strong fuel smell in cabin or near engine bay, Hard starting after sitting overnight, Rough idle and hesitation, Visible fuel wetness on high-pressure fuel pump

Fix: High-pressure fuel pump seal or regulator diaphragm fails on 2.0 Turbo engines. Requires pump replacement and fuel system pressure test. 3-4 hours labor with fuel system depressurization and safety protocols. Can cause fire risk if ignored.

Estimated cost: $650-1,100

Symptoms: Water dripping from headliner onto driver/passenger, Wet carpet in front footwells after rain or car wash, Musty smell inside cabin, Water pooling in sunroof track

Fix: Four drain tubes (one per corner) clog with debris, causing water backup. Most common at front drains exiting behind front wheels. Clear tubes with compressed air or flexible wire, verify exit points. 1-1.5 hours labor if tubes intact; if cracked internally, requires headliner removal adding 4-6 hours.

Estimated cost: $120-250