FaultScore

KIA K5 fuel system problems

152 of the 748 complaints filed about the KIA K5 are about the fuel system — 20% of everything owners reported. The worst model year for it is 2021.

152

Complaints

20%

Share of all complaints

0

Crashes

2

Fires

Fuel & Propulsion complaints by model year

2021 K5 54 35.5%

Median failure at 113,000 miles

2022 K5 43 28.3%

Median failure at 85,000 miles

2023 K5 51 33.6%

Median failure at 60,000 miles

2024 K5 4 2.6%

What owners said

2021 KIA K5 at 111,000 miles Milledgeville, GA

FUEL SYSTEM, GASOLINE

The contact owns a 2021 Kia K5. The contact received notification of NHTSA Campaign Number: 25V794000 (Fuel System, Gasoline). The vehicle was taken to a dealer for the recall repair. The contact was struggling to receive updates on the status of the vehicle. The contact spoke with a service clerk and was informed that the repair was going well and that only one recall test remained. However, a supervisor later called and stated that the recall repair could not be completed. The vehicle could not be repaired. The vehicle was no longer functional due to a high risk of catching fire from fuel tank swelling caused by the recall defect. The contact stated that prior to the dealer visit, the vehicle had no issues but became inoperable. The vehicle was not repaired, and the dealer stated that the vehicle could not be repaired. The manufacturer was made aware of the issue. The failure mileage was approximately 111,000.

NHTSA complaint #11757490 — an unverified report by a vehicle owner.

2021 KIA K5 National City, CA

FUEL/PROPULSION SYSTEM

I am reporting a violation of the National Traffic and Motor Vehicle Safety Act by Ball Kia (National City, CA). The dealer tried to deny service for recall 25V794000 (SC356) for a melted, leaking fuel tank, fabricated a false diagnostic narrative of road impact to exploit me, and tried to charge $3,000 out-of-pocket for a federally mandated free repair.My vehicle has a severe fuel leak from a compromised fuel tank. Ball Kia service refused the recall, claiming "external aesthetic factors" or "road debris impact" caused it, and pressured me to tow it away.Using my military infantry experience in mechanical damage assessment, I inspected the vehicle in the service bay. I verified there is absolutely no puncture, tear, scrape, or kinetic impact on the fuel tank assembly. The dealer pointed to a split in the fuel tank protector panel, but a professional assessment shows this is false. The plastic protector panel failed due to extreme thermal exposure; the expanding tank pressed it against the hot exhaust, causing it to melt and tear under heat/pressure, not a kinetic strike.The tank itself is structurally melted and deformed with zero signs of road impact. This physical evidence matches the exact defect mechanism in the NHTSA recall: a deteriorated check valve allows intake pressure into the fuel tank, causing it to expand, hit hot exhaust components, melt, and leak.Only after I read the exact NHTSA safety risk and remedy text verbatim did the service manager back down and open a manufacturer Tech Line.Because I had to fight a fraudulent diagnosis to get this safety mandate acknowledged, I fear internal dealership retaliation, being blacklisted, or receiving a subpar, dangerous repair. Leaving a high-risk fire defect unaddressed is a public safety hazard. Please audit Ball Kia's handling of campaign 25V794000 to ensure they are not endangering or defrauding other affected Kia K5 owners.

NHTSA complaint #11757545 — an unverified report by a vehicle owner.

2023 KIA K5 Port ST Lucie, FL

FUEL/PROPULSION SYSTEM

What component or system failed or malfunctioned, and is it available for inspection upon request? Fuel pump, fuel tank and valve check. How was your safety or the safety of others put at risk? SEE PHOTO. on turnpike 95. Has the problem been reproduced or confirmed by a dealer or independent service center? Confirmed by the dealer yes. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Bev smith KIA sent my info to KIA America when they saw it. SEE PHOTO. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? It blew up on me.

NHTSA complaint #11754095 — an unverified report by a vehicle owner.

2021 KIA K5 Lake Park, GA

FUEL/PROPULSION SYSTEM

Recall NNK post-repair failure. Dealership: Kia of Valdosta (RO# XXX). After ECU update NNK-02-0118, my K5 suffered a severe loss of acceleration and torque. The car cannot safely merge on highways. The dealer’s own live scan data sheet proves that at 4,997 RPM under full load, the Turbo Recirculation (Dump) Valve reads "OFF". The factory tool key explicitly states (OFF = Open). The service manager is misreading the tool, claiming "OFF" means closed, and refuses to fix it. The boost gauge only rises under heavy floor acceleration, proving an uncalibrated boost leak. I have uploaded a photo of the technician's data sheet directly to the attachments and will also drop link to videos of my car in normal and sport mode. I have also opened Kia Corporate Case #XXX. I demand a corporate Regional Technical Manager review this data and authorize a Turbocharger Recirculation Valve (RCV) and Wastegate Adaptation Relearn at an alternate dealer...... 1. [XXX] 2. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11753897 — an unverified report by a vehicle owner.

2022 KIA K5 Fairdale, KY

FUEL/PROPULSION SYSTEM

On XXX, while traveling to [XXX], I experienced serious fuel system problems after filling my vehicle. The fuel gauge fluctuated from full to empty, and a loud pop caused the rear seat, where my two children were sitting, to lift upward. The vehicle would not accept more fuel despite the empty reading. I called AAA, but before the tow arrived, the gauge returned to normal, so I continued my trip. After returning to [XXX], I checked my Kia app and discovered active Recall SC356 describing a damaged check valve that could cause fuel tank expansion, rear seat lifting, and abnormal fuel gauge behavior—the same symptoms I experienced. On XXX, I brought the vehicle to The Kia Store in Louisville, advised them of the recall and my symptoms, and requested an inspection. Service Advisor Sidney Daub stated the issue was caused by a scratched muffler, not the recall, and no recall repair was performed. Relying on that assessment, I continued driving. From XXX, while traveling to [XXX], the same problems returned. Smoke came from the fuel tank area, fuel sprayed onto me when I opened the fuel door, and the vehicle became disabled and required towing home. I then took it to Kia Store East on June 10. There, [XXX] advised the failure was related to Recall SC356, and Haley informed me Kia Consumer Affairs would contact me. After weeks of communications, Kia advised on XXX that the vehicle was unrepairable and requested ownership documents. On XXX, Kia offered only to satisfy my loan balance through a buyback. I believe the dealership's failure to properly diagnose & repair the recall condition in April directly contributed to the later failure, safety hazards, towing expenses, and loss of my vehicle. I respectfully request that NHTSA investigate Kia's handling of Recall SC356 and the dealership's actions, & encourage Kia to consider a replacement vehicle, collateral swap, or another equitable resolution. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11753652 — an unverified report by a vehicle owner.

2023 KIA K5 Bear Branch, KY

FUEL/PROPULSION SYSTEM

The vehicle is grounded at the dealership due to NHTSA Campaign 25V794 (Kia Recall SC356). The vehicle's fuel tank has critically expanded and swollen, causing permanent structural and chassis deformation inside the vehicle. The dealership service department has documented this structural damage, confirmed the vehicle is entirely unsafe to operate due to an immediate fuel system fire hazard, and stated the vehicle is likely unrepairable. The manufacturer is currently holding the hazardous vehicle but is failing to provide immediate alternative transportation, leaving the consumer stranded and creating severe financial hardship. I do not have the financial means to pay rental car fees up front for an extended and undetermined amount of time while waiting for Kia to decide the next step. All of the issues with the vehicle are directly related to the manufacturer defect. My safety was at risk while operating the vehicle due to a severe fire risk.

NHTSA complaint #11753686 — an unverified report by a vehicle owner.

2023 KIA K5 Warner Robins, GA

FUEL/PROPULSION SYSTEM

car taken to Hutchenson Kia of Macon for Kia recall Campaign SC356. I heard loud pop a few days before appointment. The dealership stated the gas tank failed structural inspection and has already expanded. This put me and my children in danger. The dealership kept my vehicle and will not give me me a loaner. They left me stranded without a way to get home or pick up my kids from daycare. the 1800 # said my car isnt under warranty so they arent obligated. If they keep my car an say its a safety hazard they should be obligated. im told i have to wait 3-5 business day to get a case manager to see how they can assist me,

NHTSA complaint #11753777 — an unverified report by a vehicle owner.

2022 KIA K5 Zachary, LA

FUEL/PROPULSION SYSTEM

As I was driving down the road, I began to hear a loud, forceful noise. I assumed it was something in my trunk rolling against the rear seats. The noise kept getting louder, and I pulled over, very frightened, as several warning lights came on, including the low fuel light and check engine light, and the fuel gauge needle was past “E.” Before the incident, the GPM reading was 400. After a while, I made it home, but the car started making loud noises and then died. That’s when I noticed my back seats were lifted. I called Kia customer service and had the car towed to the Kia dealership on Seigan Lane, where it is now. Something needs to be done about this.

NHTSA complaint #11753188 — an unverified report by a vehicle owner.

2023 KIA K5 Eastvale, CA

FUEL/PROPULSION SYSTEM

I brought my 2023 Kia K5 to Citrus Kia in Ontario, California on 2/20/2026 for two safety recalls, including Recall SC356 involving a defective fuel check valve that can cause the fuel tank to expand, melt, and potentially catch fire. When I picked up my vehicle on XXX, I was given a repair invoice stating that both recalls had been completed. Four months later, I received another recall notice by mail for SC356. After contacting Kia corporate, they confirmed that Citrus Kia had never completed the recall, despite providing me with paperwork stating that it had been done. I made multiple attempts to contact the dealership for an explanation but my calls were never returned. Kia corporate also had difficulty reaching the dealership. They ultimately confirmed with Citrus Kia that the recall had NOT been performed and instructed me to have it completed at another dealership. This was not a minor paperwork error. Citrus Kia falsely represented that a serious safety recall involving a potential fire hazard had been completed when it had not. I have the dealership's own repair invoice documenting that they claimed the work was finished. I also have a voicemail recording from Kia corporate stating they were told by Citrus Kia that the recall was actually not completed. What is most alarming is that Kia corporate never asked the dealership why they provided an invoice stating the safety recall was completed when it had not. Attachments: page 3 of invoice from 2/23/2026 shows Recall SC356 as completed; 2 screenshots from NHTSA and [XXX] on 7/23/2026 shows Recall SC356 as not completed. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11752750 — an unverified report by a vehicle owner.

2021 KIA K5 at 119,185 miles Laurel, MD

FUEL SYSTEM, GASOLINE

The contact owns a 2021 Kia K5. The contact stated that while driving approximately 55 MPH, the fuel gauge suddenly went from one-half tank to empty. The fuel level displayed 120 miles to empty. The contact attempted to refuel the vehicle but was unable to add fuel to the tank. The contact also stated that the oil warning light and the TPMS warning light was illuminated. The contact associated the failure with NHTSA Campaign Number: 25V794000 (Fuel System, Gasoline). The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 119,185.

NHTSA complaint #11752335 — an unverified report by a vehicle owner.

2021 KIA K5 at 120,000 miles Miramar, FL

FUEL SYSTEM, GASOLINE

The contact owns a 2021 Kia K5. The contact stated that there were failures with the spark plugs. While driving at an undisclosed speed, the vehicle shuddered, and the engine sputtered. The contact stated that fuel spewed out of the filler neck while refueling the vehicle, and the fuel gauge incorrectly indicated that the fuel tank was empty after refueling. Additionally, there was an abnormal egg and sulfur odor coming from the vehicle with the check engine warning light intermittently illuminated. The contact stated that the vehicle was taken to a local dealer and inspected under NHTSA Campaign Number: 25V794000 (Fuel System, Gasoline). During the inspection, the seats were damaged. The vehicle was not repaired. The manufacturer was notified of the failure and was negotiating a buyback. The failure mileage was approximately 120,000.

NHTSA complaint #11752163 — an unverified report by a vehicle owner.

2023 KIA K5 Lake Charles, LA

FUEL/PROPULSION SYSTEM

7/20/26 My 17 year old daughter was on the way to work and heard a loud noise like an explosion in her car. She, new to driving, scared and in a panic just assumed this was a blowout on a tire and pulled over to check the tires. All tires were clear so she proceeded to work cautiously, on her way home she noticed her check engine light had come on and noticed there was some road noise coming from the back. She then called me, note this is the first I heard of the situation. While on the phone with her I pulled up the CarFax to check when it had last been maintenanced, while doing that I saw for the first time TWO RECALLS on this car we had just purchased 3 months ago! By this time she was home and I instructed her to get out of the car while I Immediately called our local Kia dealership to schedule an appt to have the two recalls fixed (7/20/26 at 4:38pm). I gave the make and model to the service department and they informed me they couldn’t see me till Wed July 29th,at 8:00 am. When my husband and I further assessed the car after we got home we found that an explosion had occurred around her fuel tank, which was full at the time of the incident! The fuel tank expanded enough to completely rupture and detach her entire backseat! This incident was due to a recall replacing a valve on the fuel tank that was not conducted on the car from prior owners nor communication to the new owners (ME) upon my purchase of the vehicle. This could have been catastrophic to my daughter and anyone else in the vehicle had she kept driving the car and could have very easily been engulfed with flames and loss of life especially with a full tank of gas. The car has been towed to the local Kia dealership and leaked gas all in our driveway as it sat there. We are still awaiting response from Kia on our case it has been over 48 hours now and we have received no communication from them. KIA NEEDS TO DEEM THIS RECALL AS POSSIBLY FATAL AND ACT IMMEDIATELY TO SAVE LIVES!

NHTSA complaint #11752175 — an unverified report by a vehicle owner.

2023 KIA K5 Lauderhill, FL

FUEL/PROPULSION SYSTEM

I am filing this complaint regarding Kia America’s handling of a safety recall and repurchase of my 2023 Kia K5 GT-Line (VIN: [XXX]. I purchased this vehicle used on XXX, and financed it through Capital One. After taking my vehicle to an authorized Kia dealership for the fuel tank valve safety recall, I was informed that my vehicle was unsafe to drive and could not be repaired. The dealership advised me that Kia would be repurchasing the vehicle. Kia has offered to buy back the vehicle, but the settlement being offered does not appear fair under the circumstances. Although Kia has determined that my vehicle is unsafe and unrepairable due to a manufacturer safety defect, I have only been provided with 15 days of rental vehicle coverage while Kia’s own repurchase letter states that the process may take 60 to 90 days to complete. This could leave me without transportation through no fault of my own. Additionally, Kia has refused to reimburse my $4,000 down payment or provide any additional compensation related to the loss of use of my vehicle. Their offer also includes a substantial mileage deduction under certain options, despite the fact that this repurchase is the result of a manufacturer safety defect rather than a voluntary sale or trade-in. I requested written clarification regarding my settlement options, rental coverage, loan payoff, and reimbursement of my expenses. Rather than answering my questions, Kia responded only that the offer was “firm” and compliant with Florida law, without addressing the specific concerns I raised. I am requesting that this matter be reviewed to determine whether Kia is handling this safety recall and repurchase fairly and whether consumers whose vehicles are deemed unsafe and unrepairable should receive adequate transportation assistance and fair compensation while waiting for the manufacturer to complete the repurchase process. I respectfully request assistance in reviewing Kia America’s handling this case. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA

NHTSA complaint #11752242 — an unverified report by a vehicle owner.

2021 KIA K5 at 115,000 miles Macclenny, FL

FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY

The contact owns a 2021 Kia K5. The contact stated that while driving approximately 55-60 MPH, the fuel tank expanded. There were no warning lights illuminated. The vehicle was towed to the local dealer, where it was determined that the fuel tank had expanded, and that the vehicle was unrepairable. The vehicle was not repaired. The dealer offered a buyback. The manufacturer was not contacted. The failure mileage was approximately 115,000.

NHTSA complaint #11751470 — an unverified report by a vehicle owner.

2021 KIA K5 at 90,000 miles Indianapolis, IN

FUEL SYSTEM, GASOLINE

The contact owns a 2021 Kia K5. The contact received notification of NHTSA Campaign Number: 25V794000 (Fuel System, Gasoline); however, the part to do the recall repair was not yet available. The contact stated that while driving approximately 70 MPH, upon further inspection the fuel level was lowering unexpectedly. The check engine warning light was illuminated. The vehicle was taken to a local Auto Zone and was scanned with an OBD2 scanner and diagnosed with a recall-related failure. The vehicle was taken to a local dealer, where it was diagnosed with an expanded fuel tank; however, the vehicle was not repaired because the dealer was short-staffed. The dealer associated the failure with NHTSA Campaign Number: 25V794000 (Fuel System, Gasoline). The manufacturer was made aware of the failure; a case was filed; however, no assistance was provided. The failure mileage was approximately 90,000.

NHTSA complaint #11751597 — an unverified report by a vehicle owner.

2021 KIA K5 West Palm Beach, FL

FUEL/PROPULSION SYSTEM

My car is losing power upon acceleration causing a loss of power upon take off upon taking off and when gears are shifting. Told by dealer it is a problem with fuel injection. Replaced several coil packs and spark plugs on my own. Dealer repair shop had my car for 4 days for the fuel talk and valve issues and did not repair anything. Losing power when I drive in traffic and on highway is a huge safety issue causing loss of power when at highway speeds. I plugged in a code reader bought by myself which is telling me it’s coil packs. We have replaced several with no luck. There is a smell of fuel and with all the other fuel system recalls and after reading other complaints on this site that sounds similar, I fear this is a safety issue with the vehicle. They checked my fuel tank and valve but didn’t replace either. I believe this is related to all the other fuel system recalls and should be repaired free of charge by dealer as a dysfunctional fuel problem as nothing we’ve done to repair with the code reader has fixed this issue. I fear a loss of power of fire caused by the mounting fuel system issues of these issues have caused the issue I’m having. Please look into this as several other complaints I’ve read online by owners are having same issue. My car only has 68,000 miles. I’m in fear of serious injury as a cause of these issues. Also concerned dealer had my car 4 days and DID. NOT repair or replace fuel tank or fuel valve, why did they have my car this long and DID NOT REPAIR the recall that the vehicle was there and the appointment was scheduled for such? I really have a fear there is an accident in my vehicle travels caused by mounting fuel issue recalls and problems. Please please look into this and help with these mounting fuel system issues before serious injury or death!

NHTSA complaint #11749168 — an unverified report by a vehicle owner.

2022 KIA K5 Miami Gardens, FL

FUEL/PROPULSION SYSTEM

Driving anywhere in general and which ever speed my gas would leak and smell would over take the car and I have a [XXX] and [XXX] babies. This is not the first but the third recall and this is a fire hazard I can’t imagine my car going in flames while we’re already suffering with a leaking gas smell every time we drive the car I can loose my whole family I will soon being filing a lawsuit against this I want a new vehicle completely I do not feel safe in this car with my kids at all there’s always an issue and my dealership is over 40min away to be going so often throughout the years of having this car this is completely unsafe dangerous and just out right unexpectedable and will be filing soon for a new car and compensation INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11748609 — an unverified report by a vehicle owner.

2022 KIA K5 at 91,000 miles North Richland Hills, TX

FUEL SYSTEM, GASOLINE

The contact owns a 2022 Kia K5. The contact stated that while attempting to reverse her vehicle and then shifting the gear shift into drive, the contact noticed her check engine warning illuminated, and she heard an abnormal noise coming from the front of the vehicle. The contact then parked the vehicle, went into the dealer, and let them know about the failure, but they offered no assistance. The vehicle was initially taken to the dealer, where NHTSA Campaign Number: 25V794000 (FUEL SYSTEM, GASOLINE) was completed. It was after the recall was completed that it was discovered that the check engine light illuminated, and the vehicle was not driving properly. The dealer took the vehicle back and provided a loaner. The contact mentioned that the engine was replaced, and then a catalytic converter was replaced. Most recently, the fuel oxygen sensor was discovered to be melted. The vehicle was repaired; however, the failure persisted. The manufacturer was notified of the failure and informed that the recall was complete with no other assistance offered. The failure mileage was 91,000.

NHTSA complaint #11747936 — an unverified report by a vehicle owner.

2021 KIA K5 Marietta, GA

FUEL/PROPULSION SYSTEM

I Heard a loud noise in the backseat twice and noticed the back seat raise up also the check engine light came on but also the fuel was going down and up (the gauge), is currently at the kia dealership and has been reported fail recall

NHTSA complaint #11747487 — an unverified report by a vehicle owner.

2021 KIA K5 Franklinton, LA

FUEL/PROPULSION SYSTEM

I took my 2021 KIA K5 to the dealership in March of 2025 for an oil change. While I was there, a diagnostic test was conducted to determine if my vehicle was affected by a damaged check valve. Therefore, the car could have caught on fire while it was being driven. I was given a rental car while my vehicle was supposed to be fixed. KIA deemed my 2021 K5 to be a hazard to the road. In June of 2025, KIA offered to pay my loan balance off and give me less than $250 for the "down payment." Please note when I purchased the KIA K5 in 2021, I traded my 2018 KIA Optima. Now, in June of 2026, KIA in offering me $13,200 for my KIA K5. I have until June 29, 2026, to accept the offer. The balance on my loan will come out of that so, I will receive approximately $7000 for a car I will pay a total of $44,000 for. I never once stopped making my monthly payment and my car has been deemed a hazard for the road since March of 2025. For years, I drove a vehicle that could have potentially caused a death or injury.

NHTSA complaint #11746075 — an unverified report by a vehicle owner.

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