Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2018 Hyundai Elantra owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2018 Hyundai Elantra. The contact stated that the vehicle was consuming excessive amounts of fuel. The contact stated that there was no evidence of a fuel leak nor an abnormal fuel odor. The contact compared the fuel consumption to a previous vehicle owned that was the same year, make, and model. The contact needed to add $10-20 daily whenever the fuel gauge showed a half tank of gasoline. The contact's one-way trip from her residence to work was 35.3 miles. The vehicle was taken to the dealer and diagnosed however, the mechanic was unable to retrieve a fault code. The vehicle was test-driven for 7 miles and it was confirmed that the fuel gauge was providing inaccurate fuel readings. The dealer informed the contact to bring the vehicle back when the fuel gauge was empty to be able to have a code reading. …
The contact owns a 2018 Hyundai Elantra. The contact stated while driving 65 MPH, the vehicle hesitated, and the vehicle lost motive power. The driver was able to pull over to the shoulder of the roadway, where the vehicle failed to restart. The check engine warning light was illuminated. The vehicle was towed to an independent mechanic, who diagnosed a failure with the fuel pump. The vehicle was repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 24V528000 (Fuel System, Gasoline), but the VIN was not included. The manufacturer was not notified of the failure. The failure mileage was 6,300. The VIN was not available.
The contact owns a 2018 Hyundai Elantra. The contact stated that after refueling, the fuel gauge indicated that the fuel economy was 20 miles/gal. The contact stated that the fuel economy should have been 28 miles/gal. The contact stated that the fuel gauge was proving an incorrect reading. The vehicle was taken to the dealer however, the cause of the failure was not yet determined. The vehicle had not been repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 50,000.
The contact owns a 2018 Hyundai Elantra. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed however, the vehicle did not drive smoothly. The contact stated that the vehicle was consuming an excessive amount of oil and fuel. There were no warning lights illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The approximate failure mileage was 130,000.
On July 11, 2022 I was driving home when the MIL warning started flashing on my dashboard, and then my car began to stall. I was able to drive the car home and then have it towed to a local shop, who said that my oil was nearly gone and refilled it. The shop recommended that I take my car to the Hyundai dealership to have it checked out as it should have had at least 200 more miles before it needed an oil change. This is supported by my Hyundai dealership's sticker stating that my next oil change was due August 15 or at 52350 miles. As of today, July 23, my car has 52,209 miles on it. On Monday, July 18 I dropped off my car at the Killeen Servicemax center and asked them to run a diagnostic check and they couldn't find anything wrong with the car. My service advisor never spoke to me in person about my concerns and wouldn't answer my calls or text messages. …
Engine stalls while driving. No warning, intermitted full shut down of the engine. Can happen multiple times in a row, only making it a few hundred feet before stalling again. The only remedy is to put the car in park and start the engine again, however, that is not always easy to do when on the road, and the car can only drift and brake. It is not safe when the car stalls, especially in traffic -- can be dangerous to myself and others on the road if I am unable to pull the car over or get it to start up again on the interstate. I have been to a mechanic, and 2 dealerships who claim they cannot replicate the problem, and even when it stalled in the parking lot when I was leaving, there were no error codes on the computer. This being said, without a code or a proper diagnosis, I am at a standstill because "nothing can be done or authorized' by Hyundai without a code. …
Initial Fault Code: P0303 Replaced all 4 spark plugs and all 4 ignition coils. The check engine light extinguished momentarily but returned, logging P0303 and a new P0301 Replaced all 4 fuel injectors. CEL extinguished momentarily and then returned, logging P0303. Replaced the entire engine electrical harness. Concurrently, all related electrical components and connectors were meticulously cleaned with professional contact cleaner. CEL extinguished for significantly longer period of time, and then returned, re-logging P0303 and P0301. Thid suggested the ECU was "handshaking" with new components but re-logging the fault upon detecting the persistent core issue. A full compression test was performed. All cylinders reported results within specification. Using a borescope I inspected cylinder walls in piston tops. …
I had to replace my Cadillac converter twice and it keeps messing up on my car and I have to keep replacing my headlight bulbs on my vehicle. They keep going bad and the vehicle tells me when the headlight bulbs is out, but I don't replace the headlight bulbs, four times and the catalytic converter three times And my Blindspot detection system and rear across traffic alert system keeps going out on my car and I done replaced it and recalibrated it six times already and there should be recalls for all this on the vehicle and my license plate lights keep blowing out on my car and placed those seven times All this need to be recalled for 2018 Hyundai ELANTRA and there is loud clicking noises from the steering wheel when I turn left to right on 2018 Hyundai ELANTRA that also needs to be recalled that's a safety issue and I replaced my brakes six times and the rotors on my 2018 Hyundai …
Financed last year (2021) at 38,000 miles, financing a vehicle i wish I knew to do research before hestitly excepting my first offer, first waring was on the test drive. The car had to be towed back to dealership because the battery was dead. In the sub-zero cold, the battery with read low and this causes electrical issues, from remote start not working to unable to open the doors. The more common and reaccuring issue that is getting worst is the lack of excellaration when taking off. Realizing this drastic difference recently, I know there is some thing happening, but I have not had much good customer service when I have brought issues to dealership and services center. Also issues with harness for the back left lights. The harness that holds the bulb keeps burning out. …
This has happened a couple of times where in the middle of driving, my car automatically shuts off, I can not turn my steering wheel I can not push the brakes, everything stops working. I have to wait till my car comes to a complete stop on its own, put the car in park, turn off the ignition, turn my keys and start my car again. Then it sometimes acts like there is no power to accelerate when I'm at a full stop. RPMs go crazy, but acceleration doesn't occur. No warnings have ever come up. I received an notice about a recall, but it's for 2019 Elantra and up. Mine is a 2018, but the issues for that recall is the same thing that is happening with my car. This is DANGEROUS and can lead to serious repercussions or even death. Something needs to be done to fix this. I don't not have thousands of dollars to pay for an issue with the manufacturer.
Fuel System complaints in other Elantra years
Frequently asked questions
How common are fuel system problems on the 2018 Hyundai Elantra?
NHTSA has 27 complaints about the fuel & propulsion system of the 2018 Hyundai Elantra, 8% of the model year's 335 complaints.
Is there a recall for 2018 Hyundai Elantra fuel system problems?
No. NHTSA lists no fuel & propulsion system recall for the 2018 Hyundai Elantra, though it has 1 recall for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2018 Hyundai Elantra fuel system problems start?
Half of the complaints with a recorded mileage happened before about 10,000 miles, and 70% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 0 fires and 1 injury to fuel & propulsion system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.