Problems · NHTSA complaints

2021 Kia K5 problems

Owners filed 169 complaints about the 2021 Kia K5 with NHTSA between Nov 2020 and Oct 2026. The most-cited component is electrical system (46).

Complaints
169
Filed with NHTSA
Crashes
8
Reported by owners
Fires
2
Reported by owners
Injuries
7
People reported injured
Deaths
1
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Electrical system46
  2. Fuel/propulsion system44
  3. Engine30
  4. Power train19
  5. Fuel system, gasoline13
  6. Service brakes10
  7. Structure10
  8. Air bags10
  9. Lane departure9
  10. Forward collision avoidance9
  11. Seats8
  12. Steering7
  13. Visibility/wiper5
  14. Engine and engine cooling3

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

Data from NHTSA Complaints API · synced Oct 30, 2026NHTSA vehicle page
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20203
202113
202219
202315
202432
202545
202642

Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.

03 —Owner reports

Top problems in owners’ words

Verbatim from NHTSA complaints, newest first

Electrical system

46 reports2 fires
“65k miles. Started driving, 20 minutes into driving i was stopped at a round about then I went to accelerate and nothing happened my engine revd really loud and after about 10 seconds my car jolted forward and I was able to accelerate, this would happen every time I stopped and anytime a wanted to accelerate to another gear”
Owner complaint to NHTSAFiled Sep 23, 2026Power train, Electrical systemODI 11766532

Fuel/propulsion system

44 reports
“I am filing a safety complaint regarding my Kia K5 because I am concerned about a potentially dangerous mechanical defect. I purchased this vehicle used from CarMax approximately two years ago. Within the first 30 days of ownership, the steering wheel began shaking. CarMax repaired the problem at no cost after ordering a replacement part. Approximately two weeks ago, the steering wheel began shaking again. The problem has now progressed to the vehicle shaking, feeling as though it is skidding or slipping, and failing to accelerate properly. The check-engine light is illuminated. I contacted Kia regarding recall SC250 and was told that my vehicle does not qualify. I am concerned because my vehicle is now experiencing symptoms that I believe warrant investigation into whether they could be related to the defect addressed by this recall. I am requesting that NHTSA investigate whether my vehicle may have an unresolved or related safety defect, and whether other vehicles excluded from the recall could be experiencing similar problems. I am concerned about the risk of losing acceleration while driving, potentially putting me and other motorists in danger. I can…”
Owner complaint to NHTSAFiled Oct 9, 2026Service brakes, Engine, Fuel/propulsion systemODI 11770020

Engine

30 reports1 fire
“Vehicle experienced a severe engine misfire (P0302), rough running, and loss of power while driving. Dealership confirmed the Purge Control / PCV valve failed (replaced under Recall SC356 / 25V-794), but charged out-of-pocket for the Cylinder 2 ignition coil that failed as a direct result of the PCV valve failure. The Dealership replaced the Purge Control/PCV valve at this time - the recall was not resolved until this time - I wasn't even aware of this recall until this incident. This ocurred on XXX and as a result I was stranded 1500 miles from home in [XXX] (I live in [XXX] and was driving the vehicle to my son at the University of XXX in [XXX]. The car was running fine until I stopped briefly in [XXX] and when I started the car, the engine light came on and the car's engine started sputtering and losing power as I was driving. Due to the fact that I was not in the vicinity of any Kia Dealerships or any open mechanics as it was Labor Day, I somehow managed to drive the car all the way to [XXX] as this was the closest dealership (over 120 miles away from where I was when the engine light came on). Once I arrived in [XXX], I checked into a hotel. I then…”
Owner complaint to NHTSAFiled Sep 16, 2026Engine, Fuel/propulsion systemODI 11764825

Power train

19 reports1 related recall
“From the get-go seemed to have trouble with transmission once in a while Little jerk when shifting gears, reported this, they could find nothing. It has become a lot worse. It has caused the car to shut down into limp mode with engine light on. So I had a problem from the beginning with my new car. But when they check it, they can’t find a problem. So I’m just checking to see if anybody else with this car make, model, year have reported anything the same.”
Owner complaint to NHTSAFiled Oct 12, 2026Power trainODI 11770564

Fuel system, gasoline

13 reports2 related recalls
“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.”
Owner complaint to NHTSAFiled Aug 17, 2026Fuel system, gasolineODI 11757490

Service brakes

10 reports
“After coming to a stop brake pedal slowly sinks to floor. First noticed around 40,000 miles, inspected by team kia el cajon at 41,500 miles. Not dash lights associated. Brakes losing pressure is a major safety issue. Kia dealership had car over 30 days replaced brake master cylinder, booster and abs unit. Returned vehicle with same issue claimed normal operation.”
Owner complaint to NHTSAFiled Jun 27, 2026Service brakesODI 11746884
Data from NHTSA Complaints API (owner reports, unverified) · synced Oct 30, 2026

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.