Hyundai Elantra 2017–2020Common problems, reliability & repair costs

Symptoms: Ticking or knocking that starts faint and grows louder, often with rising oil consumption; oil-pressure light; loss of power or a sudden stall when a bearing lets go. Many owners report failure with full maintenance history and no warning light until the end.

Fix: Once a rod knocks, it's an engine — used or reman swap at an independent shop. Coverage splits sharply by year: 2019–2020 sedans are under NHTSA recall 21V-301 (improperly heat-treated piston oil rings), which gets a free inspection, Piston-ring Noise Sensing System software, and engine replacement if damage is found. 2017–2018 sedans are NOT in that recall, and the Hyundai/Kia connecting-rod-bearing class settlement covered the Nu 2.0 GDI (2014–16 Elantra, Elantra GT) — not this sedan's MPI engine. Out of powertrain warranty, a 2017–2018 failure is out of pocket; some owners have won goodwill assistance from Hyundai by escalating with full records.

Sources: NHTSA recall 21V-301 — improperly heat-treated piston oil rings (2019–2020 Elantra), CarComplaints — 2017 Elantra engine problems, Elantra Forum — 2017 Elantra SE 2.0 Nu MPI engine failure, CarComplaints news — Elantra engine ticking lawsuit

Symptoms: The car itself shows nothing — until it's stolen or the steering column is torn open in an attempt. Key-start Elantras can be started with a USB cable once the column shroud is broken. Push-button-start cars have an immobilizer and are not affected.

Fix: Hyundai released a free anti-theft software update in February 2023 — the 2017–2020 Elantra was in the very first wave — that adds an ignition-kill armed by locking with the fob. The update is free; the real-world costs are repairing a torn-up column and ignition after an attempt ($300–$1,500) and higher insurance premiums in theft-heavy metros. Get the update, use a wheel lock, and keep the window decal.

Sources: NHTSA — Hyundai/Kia anti-theft software campaign, Hyundai newsroom — free anti-theft upgrade, starting with 2017–2020 Elantra

Symptoms: Chips from small road debris that would bounce off other cars, and cracks that spread from the edge of the glass, sometimes within the first months of ownership. Owners report multiple chips in quick succession.

Fix: Windshield replacement. Hyundai routinely denies these as warranty claims by pointing to an impact point, and owners filed suit over it. When replacing, ask the glass shop about brand — some owners report aftermarket glass on this car is even more fragile than OEM. Carry glass coverage on your insurance; on this car it will pay for itself.

Sources: CarComplaints — 2017 Elantra complaints, Torque News — Hyundai windshield cracking lawsuit, Elantra Sport Forum — Cracked Windshield Club

Symptoms: Paint peeling in sheets from the hood, roof, and around panel edges — most reported on white cars. Starts as small chips or bubbles, then spreads. Cosmetic, but it invites rust and kills resale.

Fix: Body-shop respray of affected panels; a hood-and-roof job runs toward the top of the range. It's CarComplaints' worst-rated 2017 Elantra problem category by cost outside the engine. Hyundai has handled some cases as goodwill within ~5–6 years — push with photos before paying — but out-of-warranty owners usually eat this one.

Sources: CarComplaints — 2017 Elantra body/paint problems

Symptoms: Hesitation or a dead pause pulling away from a stop, lurching on hills, shuddering under light throttle at low speed — worse in hot weather and stop-and-go traffic. Distinct from the smooth-but-delayed engagement that is normal dry-DCT behavior.

Fix: First step is a TCM software update and clutch-touchpoint relearn at a dealer (cheap). True shudder usually means a worn clutch pack — a $1,200–$2,500 job out of warranty. Hyundai's DCT drew a class action over exactly this hesitation behavior. If you can't live with dual-clutch manners in traffic, buy a 6-speed auto 2.0L car instead.

Sources: Hyundai Forums — Elantra Eco 1.4T DCT thread, Elantra Sport Forum — hesitation at acceleration, Norman Taylor & Assoc. — Hyundai DCT defects overview

Tools: None (hands only); small screwdriver helps on the airbox clips

1. Open the glovebox, pop the damper arm off the side, and squeeze the stops to drop it down.
2. Slide out the cabin filter tray and insert the new filter with the airflow arrow pointing down.
3. Under the hood, unclip the airbox lid, swap in the new engine filter, and re-clip.
4. Cycle the blower on high and check for whistles or flapping — that means the cabin filter is seated wrong.

Tools: Floor jack + jack stands, Socket set (14/17mm) and breaker bar, C-clamp or caliper piston tool, Torque wrench, Brake cleaner + silicone paste

1. Loosen the lugs, jack the front, set it on stands, and pull the wheels.
2. Remove the two caliper slide bolts, hang the caliper on a hook — never by the hose — and slide out the old pads.
3. Remove the caliper bracket, pull the rotor (it may need a tap with a mallet), and clean the hub face.
4. Install the new rotor and bracket, compress the piston with the clamp, and fit the new pads with a smear of paste on the ears and slide pins.
5. Reinstall the caliper, torque everything to spec, and pump the pedal firm before moving the car.
6. Bed the pads: 6–8 moderate stops from 35 mph without coming to a complete halt.

Tools: 3/8" ratchet with 14mm thin-wall magnetic spark plug socket, 6" extension, 10mm socket (coil bolts), Torque wrench

1. With the engine cold, remove the plastic engine cover and unplug the four ignition coil connectors.
2. Remove each coil hold-down bolt and pull the coils straight up.
3. Blow debris out of the plug wells, then remove the old plugs with the thin-wall socket.
4. Thread the new plugs in by hand first — the aluminum head cross-threads easily — then torque to spec. Do not gap-check iridium plugs against the porcelain.
5. Reinstall coils and connectors, start the engine, and confirm smooth idle with no misfire codes.