Some vehicles may exhibit difficulty starting in cold weather. This bulletin provides the procedure to perform an inspection on the starter magnetic switch for potential freezing and, if necessary, replace the starter magnetic switch (solenoid) assembly.
full bulletin at NHTSA ↗2018 Hyundai Kona engine problems
severe 23 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Complaints
23
Recalls
0
Avg fix
$3,100
3fires
1injury
When does it fail?
Of the 23 engine complaints filed for the 2018 Hyundai Kona, here's the actual mileage breakdown — failures cluster heaviest at 100,000-125,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Engine accounts for 32% of every owner complaint on file for this vehicle — the dominant problem area across 4 categories tracked.
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.
This bulletin provides important checkpoint guidelines when performing engine oil and filter change services.
full bulletin at NHTSA ↗Certain 2018-2022MY Kona (OS) vehicles equipped with 2.0L engines and 4WD may exhibit transfer case oil leaks and/or an oil smell caused by the transfer case pinion oil seal overheating. This bulletin describes the procedure to update the 4WD electronic control module (ECU) and to inspect the transfer pinion area for leakage. If a leak is detected, the transfer case pinion oil seal will need to be replaced.
full bulletin at NHTSA ↗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 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
The 2018 Hyundai Kona engine failures cluster into three catastrophic patterns. First are fires: engine compartments ignite during normal operation or immediately after short trips, with no warning lights or symptoms—one at 17k miles, another at 63k miles after recent service. Owners report smoke followed by flames, destroyed vehicles, damaged adjacent property, and injuries including smoke inhalation and collapsed lung. Fire investigators and Hyundai both inspected burned vehicles; Hyundai denied responsibility in at least one case.
Second is rapid oil consumption paired with engine knock, power loss, and eventual stall or seizure. Owners report burning 0.5 to 1+ quart per week, loud engine knock (especially under acceleration), and low oil warnings despite regular top-ups. Diagnostics show piston ring failure, low compression in affected cylinders, and timing chain slip. Engine replacement is quoted at $11k–$17k. Third is sudden stall at highway speed with no advance warning—vehicles lose acceleration, shudder violently, and die, sometimes four times over weeks. Check engine lights appear only *after* the event.
Owners consistently note the 2018 carries no recall despite the 2019 Kona having a recall for the same G4FJ engine and identical oil consumption issues, and despite similar recalls in Australia (2019) and for related Hyundai models (Veloster, Tucson). Warranty claims are regularly denied, with one owner denied a promised 10-year powertrain warranty due to dealership fraud.
Same Hyundai Kona engine reports on nearby years: 2019 · 2020 · 2021
Failure modes owners describe
Engine fire—unwarned combustion in engine compartment
Engine compartment caught fire during normal operation or immediately after short trip/highway driving. In one case, fire investigator confirmed origin in Kona. In another, vehicle had no warning lights or symptoms; it simply ignited at gas pump with only 17k miles. A third case involved fire after recent service work. No diagnostic codes or warning lights preceded fires in any case.
When: One case at 17k miles, another around 63k miles; one during recent service; one burst into flames in garage after routine store trip
Symptoms owners cite: Engine compartment flames with no advance warning; Smoke visible from engine compartment; Electric door locks failed during fire incident
Repairs/costs cited: Vehicle destroyed in all cases. Fire investigator and Hyundai both inspected one vehicle; Hyundai denied responsibility. Insurance companies declared vehicles total losses.
Recalls/TSBs owners mention: Hyundai inspected at least one burned vehicle and failed to take responsibility or notify other 2018 Kona owners. Owner notes 2018 Kona has no recalls despite same G4FJ engine as recalled Veloster and shared layout with recalled Tucson; Australia issued fire-related recall for Kona in 2019 for brake tube routing near exhaust.
Engine knock with oil consumption—piston/ring degradation
Engine develops progressive knocking (especially under acceleration or uphill), often accompanied by rapid oil consumption (0.5–1+ quart per week). Knocking may appear intermittent at first, then become constant. Power loss, hesitation, and vibration follow. Oil consumption test shows elevated burn rate. In one case, piston rings diagnosed as failed; another found significantly lowered cylinder compression (105 vs 140 PSI). No check engine light in early stages; light may appear only after failure becomes severe.
When: Typically 50k–126k miles; some reports before 100k, others after
Symptoms owners cite: Loud knocking from engine; Oil consumption: 0.5–1+ quart per week; Loss of power/poor acceleration; Vibration and shuddering; Engine hesitation; Check engine light (sometimes delayed); Low/no oil despite recent fill-ups
Codes mentioned: P0301 (cylinder 1 misfire), Hall sensor error, Cam shaft timing error, No compression in cylinders 1 and 3 (reported in one case), Misfire in cylinders 1, 2, 4
Repairs/costs cited: Diagnostic cost $189–$3600 range. Engine replacement quoted at $11,000–$17,000. One dealer performed combustion chamber cleaning per Technical Service Bulletin; owner reports lack of confidence in fix. Piston ring failure confirmed in one case by dealer.
Recalls/TSBs owners mention: Owners note 2018 Kona has no recall despite 2019 Kona recall for same G4FJ engine and same oil consumption issue. One owner told after oil change that problem 'wasn't reproducible.' Hyundai warranty expired or claim denied in multiple cases; one owner denied full 10-year powertrain warranty despite salesman promise due to dealership fraud (embezzlement case). Combustion chamber cleaning offered as TSB fix in one case.
Sudden loss of power and stall—no warning
Vehicle loses acceleration ability or stalls abruptly while driving at highway speed or from stop, often with no preceding warning lights or symptoms. In one case, vehicle stalled four times over several months; dealer replaced ignition coil but problem recurred. In another, loss of power and stall with check engine light only appearing *after* event. Multiple cases of stall at 65–70 MPH requiring hazard lights and roadside pull-over or towing.
When: 17k miles to 100k+ miles; one case repeated stalls over one month post-repair
Symptoms owners cite: Sudden loss of acceleration; Uncontrollable shuddering/vibrations; Engine stall while driving; Inability to restart or restart with max ~10 MPH capability; Check engine light (often appearing after event); Sputtering before stall
Codes mentioned: P0301 (in context of stall), Check engine light (timing varies)
Repairs/costs cited: Dealer replaced ignition coil in one case (ineffective). Mechanic found timing chain slipped a tooth and one piston at 105 PSI vs. 140 PSI normal. Dealer quoted $12k–$17k for engine replacement.
Recalls/TSBs owners mention: One case referred owner to NHTSA Hotline; manufacturer opened case but VIN not under recall. No repair covered under warranty.
Engine seizure due to oil starvation
Engine seizes after oil depletion, often following an oil leak. Owner reported no visual warning or check engine light until vehicle lost power; oil and battery warning lights then illuminated simultaneously. In at least one case, engine was bone dry when inspected post-failure.
When: 35,300 miles in one reported case; another at 63,000 miles
Symptoms owners cite: Oil warning light (appears at time of failure); Battery warning light; Vehicle will not accelerate; Oil leak beneath vehicle; Engine seizes; no restart
Repairs/costs cited: Engine replacement required in both cases; one cost estimate not provided. One owner had just completed 60k mile service a few days before seizure.
Recalls/TSBs owners mention: Warranty expired or claim denied; manufacturer stated warranty had elapsed at 35,300 miles.
Timing chain slip and cam timing error
Timing chain slips a tooth, causing Hall sensor and cam shaft timing diagnostic codes. Accompanied by sudden shudder/vibration and power loss while driving. Results in misfire and significantly lowered compression in affected cylinder(s).
When: 87,000 miles in reported case
Symptoms owners cite: Large shudder/vibration through vehicle; Loss of power; Check engine light; Audible knock
Codes mentioned: Hall sensor error, Cam shaft timing error
Repairs/costs cited: Mechanic found timing chain had slipped a tooth and one piston at 105 PSI vs. 140 PSI (indicative of pending total engine failure). Engine replacement quoted $12k–$17k.
Recalls/TSBs owners mention: Recall issued for 2019 model for same issue and symptom, but Hyundai stated it does not apply to 2018 model.
Synthesized from 23 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 5 most recent
Felt a large shudder/vibration go through the whole car while on the highway and lost some power. The check engine light came on immediately after so we took it to a mechanic. Diagnostics came back as Hall sensor and cam shaft timing errors. It was found that the timing chain had slipped a tooth. Additionally, one of the pistons was found to have significantly lower PSI than the rest (105 vs 140)…
I am having issues with my oil consumption and my car is going through a quart of oil every 1-1.5 weeks. There have been similar recalls on the 2019 Kona’s which have the same 1.6L 4-cylinder engine. My car is currently a little over 126,000 miles
Vehicle was traveling down the highway with cruise control on and suddenly proceeded to not maintain speed and lost the ability to accelerate and shake in the middle of the interstate. Check engine light came on after this and we were able to limp it off the highway onto the ramp. No warning lights, no over heating, or any signs were given prior to this incident to give the impression this…
The contact owns a 2018 Hyundai Kona. The contact stated while her daughter was driving at undisclosed speeds, the engine warning light illuminated. There was an abnormal knocking sound coming from the vehicle. The vehicle was taken to an independent mechanic, who determined there was knock in the cylinder. The vehicle was taken to the local dealer, where it was determined that the cam was…
Pulled into driveway and saw smoke coming from engine. Popped hood and saw engine block was on fire. Quickly closed the hood and called 911. Within a few minutes the car was completely engulfed. I just had the car serviced a few days earlier and prior to that i had the 60k mile maintenance service done. There was around 63k miles on the car.
Had engine trouble with your 2018 Hyundai Kona?
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 Kona?
It's a meaningful issue. 23 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?
Based on the 23 complaints filed, engine issues most often appear around 70,721 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
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/Kona.
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.