This bulletin provides important checkpoint guidelines when performing engine oil and filter change services.
full bulletin at NHTSA ↗2018 Hyundai Elantra engine problems
severe Owners of the 2018 Hyundai Elantra have filed 89 NHTSA complaints about the engine, typically surfacing around 55,000 miles at roughly $3,100 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See engine across all vehicles →
Failure mileage
Complaints
89
Recalls
0
Avg fix
$3,100
| Model year | engine complaints |
|---|---|
| 2014 Elantra | 105 |
| 2015 Elantra | 60 |
| 2016 Elantra | 80 |
| 2017 Elantra | 170 |
| 2018 Elantra (this page) | 89 |
| 2019 Elantra | 98 |
| 2020 Elantra | 74 |
| 2021 Elantra | 9 |
| 2022 Elantra | 8 |
1crash
4fires
What stands out
Engine accounts for 32% of every owner complaint on file for this vehicle — the dominant problem area across 12 categories tracked.
Owners have filed 89 engine complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Follow the guidelines outlined in this bulletin to inspect and clean or replace certain components of the engine intake system accordingly during engine short block or sub-assembly replacement.
full bulletin at NHTSA ↗This bulletin provides information related to an Electronic Control Module (ECM) software update to revise control logic for completion of OBD-II Fuel System Readiness Monitor diagnosis.
full bulletin at NHTSA ↗This update includes information related to Electronic Control Module (ECM) software to revise control logic for completion of OBD-II Fuel System Readiness Monitor diagnosis.
full bulletin at NHTSA ↗This bulletin provides the service procedure for engine connecting rod bearing clearance testing. Perform the procedure outlined in this bulletin to fulfill the Bearing Clearance Test inspection requirements to determine next required steps.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of the 2018 Hyundai Elantra report engine failures across all mileage ranges, with rod bearing wear being the most common cause of complete engine seizure. Connecting rod bearings wear prematurely, producing loud knocking noises that precede catastrophic failure—often with zero warning lights. Many failures occur after recent oil changes or with no low-oil warning despite critically empty dipsticks, pointing to a combination of design defects: manufacturing debris (paint chips found clogging oil pickup tubes), inadequate sensor monitoring, and bearing metallurgy issues.
Excessive oil consumption is endemic, with owners burning a quart every 5,000–7,000 miles on vehicles with perfect maintenance records. Ignition coil packs fail repeatedly, sometimes replaced 3–6 times over the vehicle's life, generating misfire codes and stalling events at traffic lights and highway merges. Hyundai issued Technical Service Bulletin 20-01-008H to address misfire logic flaws, yet many dealers refuse to apply it, claiming VINs aren't in the campaign—even when symptoms match exactly.
Worst-case scenarios include engine fires while driving and sudden stalls on freeways with complete loss of steering and braking. The 2019–2020 models received recalls for identical engine problems; the 2018 did not. Hyundai has acknowledged the defect exists but declined responsibility for out-of-warranty repairs in most cases.
Same Hyundai Elantra engine reports on nearby years: 2015 · 2016 · 2017 · 2019 · 2020
Failure modes owners describe
Rod bearing failure / crank journal wear
Connecting rod bearings wear prematurely, causing metal-to-metal contact, knocking sounds, and catastrophic engine failure. Crankshaft journals become scored and out of tolerance. Owners report finding metal shavings, aluminum chunks, and worn bearing coatings.
When: Reported from 30,000 to 183,000 miles; multiple failures occur after 100,000 miles. Some occur after recent oil changes.
Symptoms owners cite: Loud knocking or clanking noise from engine, especially under acceleration; Metallic rattling sound during startup or at higher RPMs; Engine stalls without warning; Metal shavings or chunks found in oil pan or on road; Complete engine seizure and loss of motive power
Codes mentioned: P0017 - Crankshaft Position Correlation, P0300-P0304 - Cylinder misfire codes
Repairs/costs cited: Full engine replacement required in most cases. Cost approximately $10,000. One owner replaced rod bearings themselves after finding crankshaft journal 0.001" out of tolerance; failure recurred after 5 miles of driving.
Recalls/TSBs owners mention: Hyundai has issued recalls for 2019 and 2020 Elantra engines (2.0L) but not for 2018 model year. Some owners report Hyundai covering 50-70% of replacement cost out of warranty. TSBs exist for earlier Theta 2.0L engines (similar failure mechanism).
Excessive oil consumption / low oil damage
Engine consumes oil at abnormal rates, sometimes burning a quart every 5,000-7,000 miles. Owners report checking dipstick and finding no oil without warning lights activating. Leads to inadequate lubrication, bearing wear, and eventual engine failure.
When: Issues begin around 30,000-100,000 miles on vehicles with regular maintenance. Some owners experience problems even with synthetic oil and proper service intervals.
Symptoms owners cite: Oil level drops rapidly between scheduled changes; Ticking or knocking noise when oil is low; No low-oil warning light despite critically low levels; Overheating issues; Engine stalls due to lack of lubrication
Codes mentioned: P0011 - Camshaft Position Timing - Over Advanced
Repairs/costs cited: Owners add oil frequently to maintain operation. Some dealerships require premium synthetic oil at higher cost or claim warranty will be voided for non-compliance. One owner paid $6,000 for CVVT repair; issue returned.
Recalls/TSBs owners mention: No recall issued for 2018 Elantra despite same issue affecting recalled 2019-2020 models. Dealership service centers acknowledge the issue is widespread. One Valvoline service center imposed surprise requirement for premium oil or warranty voided.
Paint chips and debris in oil system
Manufacturing contamination: paint chips, metal particles, and dirt found in oil pan and oil pickup tube screen. These particles clog the lubrication system and restrict oil flow to critical engine bearings.
When: Present from factory; discovered during repair work when engines seize or fail.
Symptoms owners cite: Low oil pressure warning light; Engine seizure; Timing chain slapping; Metal particles visible in oil upon inspection
Repairs/costs cited: One owner cleaned oil pickup tube screen clogged with paint chips and removed paint from pan. Owner reports widespread issue likely responsible for many Hyundai/Kia vehicles in junkyards.
Ignition coil pack failures and recurring misfires
Ignition coils fail prematurely, causing repeated misfire codes and engine stalling. Some owners have replaced coils multiple times (up to 6 replacements over 7 years). Even OEM coils fail; issue persists despite coil replacement.
When: Can occur as early as 12,000 miles and recur throughout vehicle life. One owner had 3 replacements since 2018; another had multiple failures within years.
Symptoms owners cite: Rough idle or violent shaking when starting; Check engine light with misfire codes (P0300, P0301, P0302, P0303, P0304); Unable to start or difficult starting; Loss of power during acceleration; Engine stall at low speeds (25 mph, stop lights)
Codes mentioned: P0300 - Random/Multiple Cylinder Misfire, P0301 - Cylinder 1 Misfire Detected, P0302 - Cylinder 2 Misfire Detected, P0303 - Cylinder 3 Misfire Detected, P0304 - Cylinder 4 Misfire Detected
Repairs/costs cited: Repeated coil replacements ($1,700+ cited for 6 coils over 7 years). OEM Hyundai coils required; aftermarket coils do not resolve issue. Issue persists even after ECM software update.
Recalls/TSBs owners mention: Hyundai TSB 20-01-008H (February 2020) addresses misfire detection logic flaws and requires ECM software update (ROM ID AD8SP2AS673D) and updated coils (P/N 27300-2E601). Some dealers refuse to apply TSB claiming VIN not in campaign. Dealer service advisors acknowledge TSB criteria match customer symptoms but refuse to apply update.
ECM/software issues causing stalling and misfire
Engine control module logic flaws or software bugs cause engine stalls and misfire detection errors. Stalls occur without warning lights in many cases. One owner documented stalling at 25 mph approaching traffic light.
When: Occurs throughout vehicle life; ECM updates do not permanently resolve issue in some cases.
Symptoms owners cite: Engine stalls without warning light illuminated prior to stall; Vehicle loses all power, power steering, and acceleration; Check engine light with camshaft timing codes (P0011, P0014, P0017); Rough idle at startup; RPMs rise unpredictably; car accelerates on its own
Codes mentioned: P0011 - Camshaft Position Over Advanced, P0014 - Exhaust Camshaft Position Timing Over Advanced, P0017 - Crankshaft Camshaft Position Correlation, P0128 - Coolant Thermostat (Engine Coolant Temp) Does Not Open Properly
Repairs/costs cited: TSB 90C042R1 / 20-01-008H ECM software update applied; issue recurs or improves temporarily. One owner paid $1,700 for CVVT repair; symptoms returned shortly after.
Recalls/TSBs owners mention: Hyundai issued TSB 90C042R1 and 20-01-008H. Dealers sometimes refuse to apply updates or claim VIN not covered in campaign despite matching symptoms.
No warning lights before failure / defective sensors
Low-oil warning and check-engine lights fail to illuminate until engine has already been severely damaged or seized. Owners unaware of problems until catastrophic failure occurs. Oil pressure warning sensor does not activate despite critical levels.
When: Throughout vehicle life; failures occur at 30,000 to 224,000 miles with no advance warning.
Symptoms owners cite: Engine seizes or stalls with no prior warning lights; Oil pressure light illuminates only after failure or shutdown; Low-oil light never activates despite zero/critically low oil; Check engine light appears only after stalling or severe damage
Repairs/costs cited: Owners forced to rely on manual oil level checks. One owner states lack of warning sensors is inexcusable when oil-consumption issue is known.
Catastrophic engine failure with metal ejection
Complete engine failure with violent symptoms: metal shards and fasteners shooting out, hole in engine block, oil spewing, smoke and flames from engine bay or exhaust. Occurs without warning.
When: Various mileages from 70,000 to 224,000 miles; some occur just after recent dealer service.
Symptoms owners cite: Loud popping sound from engine; Flames or smoke from engine bay or beneath vehicle; Loss of all power and motive power; Metal shards on road; Seized crankshaft; Hole in engine block; Oil spewing from engine
Repairs/costs cited: Full engine replacement required. One owner experienced failure at 70,000 miles (out of warranty); Hyundai covered 60% of replacement cost (approximately $6,000 of $10,000). Owner at 224,809 miles had seized crankshaft.
Recalls/TSBs owners mention: Some owners report partial coverage (50-70%) when out of warranty. One case: Hyundai initially refused to cover then offered 60% after owner contacted BBB.
Acceleration loss and lack of throttle response
Engine hesitates or loses power when accelerator pedal is pressed, especially under moderate to heavy throttle. Can occur suddenly or be chronic. One owner reported RPMs surging uncontrollably on freeway.
When: Reported from early ownership (20 miles, new car) through higher mileage (100,000+). Some chronic from purchase, others develop over time.
Symptoms owners cite: Engine lacks power response when accelerating; Hesitation before vehicle accelerates; Loss of acceleration in middle of traffic; Vehicle unresponsive to accelerator pedal; Unintended acceleration / RPMs surge on their own
Codes mentioned: P0014 - Exhaust Camshaft Position Over Advanced
Repairs/costs cited: One owner had this issue reported to dealer at 10 days of ownership; dealer claimed to inspect but issue persisted. Engine replacement indicated in some cases.
Spark knock / engine pinging under load
Abnormal pinging and rattling noises when accelerating moderately to heavily, regardless of fuel octane used. Sounds like spark knock. Dealerships unable or unwilling to diagnose (no check engine light), sometimes dismissing as normal.
When: Present from early ownership (as few as 4,000 miles, brand new off lot).
Symptoms owners cite: Pinging and rattling noises during moderate to heavy acceleration; Metallic noise under load; No check engine light despite noise; Persists across different fuel brands and octane levels
Repairs/costs cited: Dealership unable to diagnose without check engine light. One dealership claimed it was normal for the car.
Vehicle fire from engine bay / exhaust
Engine fire or flames ejecting from underneath vehicle or exhaust while driving. One documented case resulted in fire department response. Flames continue even after vehicle shutdown.
When: Reported at 77,000 miles (one case) and 70,000 miles (another case).
Symptoms owners cite: Smoke and flames from under engine bay or rear of vehicle; Loud popping sound preceding fire; Oil leaking; Engine stalling; Loss of steering control
Repairs/costs cited: Vehicle towed; not repaired in documented cases.
Recalls/TSBs owners mention: Fire department responded in one case; no manufacturer response documented in complaints.
Engine stalling during normal driving at highway and city speeds
Engine shuts off unexpectedly during normal steady driving at various speeds (25 mph to 70 mph), often without warning lights. Loss of power steering and braking. Multiple stall events common.
When: Can occur as early as 100,000 miles; multiple recurring incidents common. One owner had third stall incident at 117,000 miles.
Symptoms owners cite: Complete engine stall with no warning light prior to stall; Loss of power steering and acceleration; All warning lights illuminate after stall; Difficulty restarting or delay in restart; Multiple recurring stall events; Stalling during acceleration or turning
Codes mentioned: P0017 - Crankshaft Position Correlation, P0014 - Exhaust Camshaft Position Over Advanced, Camshaft/CCV timing codes
Repairs/costs cited: Engine replacement recommended in most cases. One owner had loud knock develop after stall.
Recalls/TSBs owners mention: Hyundai aware of issue; similar mechanism to recalled Theta 2.0L engines in other models. Some owners refused help due to mileage/warranty status.
Vehicle theft due to immobilizer defect / anti-theft software
Multiple vehicles stolen due to lack of immobilizer or immobilization fault in anti-theft system. Hyundai issued recall campaign 24-01-009H-1 and Service Campaign 993 for anti-theft software upgrade, but upgrade does not remediate theft damage. One vehicle was stolen due to immobilization fault and recovered with blown engine.
When: Theft incidents reported; one documented at 81,000 miles post-service. Hundreds of 2018 Elantras reportedly stolen and destroyed.
Symptoms owners cite: Vehicle stolen despite having keys; No immobilizer warning or prevention; Ignition and wiper control harness damaged in recovered vehicles; Engine blown after theft recovery
Repairs/costs cited: Repairs include harness replacement if recovered. Engine replacement often necessary on recovered vehicles.
Recalls/TSBs owners mention: Hyundai issued Service Campaign 993 (anti-theft software) and Recall 24-01-009H-1. Software update does not remedy existing damage from theft. Hyundai's response limited to software installation after-the-fact.
Synthesized from 89 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 4 most recent
I noticed around 100,000 miles that my car was going through oil when I heard a ticking in the engine. I pulled over and checked and there was no oil on the dipstick. No warning lights or nothing. I just kept adding oil after that and thinking that I will never buy another Hyundai again but never thinking my engine would fail full of oil. In June of 2023 my car lost power just as I got off the…
I have a 2018 Hyundai Elantra with about 155k miles. It has been consuming oil excessively and has developed serious drivability issues. If I try to accelerate even slightly harder than normal—especially above 2,000 RPM—it makes a metallic, chain-type rattling noise, loses power, and produces heavy smoke from the exhaust. The smoke sometimes continues even after shutting the engine off and…
My car lost power on a busy highway which almost caused a tractor trailer to rear end me. I had the car towed and the mechanic said the engine is bad because of issues with this engine losing oil quickly and there is no recall on it but on other years. Now I have no car but still owe money on it and can’t get to work. Luckily i wasn’t hit by the tractor trailer but this should be a recall and i…
It is showing signs of excessive oil consumption. 200 miles before my next scheduled oil change there was no oil in the car, causing overheating issues. It uses the same engine as other recalled years for the same issue. However they never issued a recall for the 2018. The only update I've ever received was a surprise notice from Valvoline, mid oil change, that if I didn't use the more expensive…
Had engine trouble with your 2018 Hyundai Elantra?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2018 Hyundai Elantra?
It's a meaningful issue. 89 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Across the 26 complaints that reported odometer mileage, most engine failures cluster between 14,000 and 86,151 miles, with the median around 55,000. A quarter of owners report trouble before 14,000; a quarter make it past 86,151. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2018/Hyundai/Elantra.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.