What breaks most · 2025 to 2026 model years
Kia K4 problems by year
Owners have filed 52 safety complaints with NHTSA about the Kia K4 across model years 2025 to 2026. Two years stand out: 2025 for electrical system complaints and 2026 for lane departure system complaints.
- Years to check closely: 2025, 2026
- Complaints on file
- 522025 to 2026, all trims
- Worst year
- 202545 complaints
- Crashes reported
- 130 fires · 9 injuries · 0 deaths
- Typical failure mileage
- 29kMedian where owners gave mileage
- Recall campaigns
- 3Across the years shown
Complaints by model year
Raw filings with NHTSA, not adjusted for how many were sold.
| Model year | Complaints | Crashes | Recalls | Most-reported component |
|---|---|---|---|---|
| 45 | 10 | 2 | Unknown or other (12) | |
| 7 | 3 | 1 | Lane departure system (4) |
What fails on the 2025 Kia K4
| Component | Share of complaints | Filings | Crashes | Parts for this job |
|---|---|---|---|---|
| Unknown or other | 27% |
12 | 0 | — |
| Electrical systemAlternators, starters and ignition | 27% |
12 | 1 | Shop all electrical system parts, not filtered to this vehicle |
| Powertrain and transmissionTransmission parts | 16% |
7 | 0 | Shop all powertrain and transmission parts, not filtered to this vehicle |
| Lane departure systemCamera sensors | 16% |
7 | 3 | Shop all lane departure system parts, not filtered to this vehicle |
| EngineEngine gaskets and seals | 16% |
7 | 0 | Shop all engine parts, not filtered to this vehicle |
| Air bags | 13% |
6 | 4 | Check recalls for air bags on NHTSA.gov |
| Forward collision systemRadar and camera sensors | 13% |
6 | 4 | Shop all forward collision system parts, not filtered to this vehicle |
| SteeringPower steering pumps, racks and hoses | 11% |
5 | 2 | Shop all steering parts, not filtered to this vehicle |
One complaint can name more than one component, so shares add to more than 100%. "Unknown or other" is NHTSA's uncategorized bucket and is shown but never ranked.
In owners' words
Complaint narratives as filed with NHTSA, trimmed for length.
-
Blind spot and front collision features inactive. Seat belt didn't unlock after crash. Airbags deployed no passenger didn't work on driver airbag b1652 dtc codes on recall for another vehicle
-
Sometimes when I’m driving the steering wheel just jerks to the left sometimes causing me to swerve into incoming traffic. It’s very scary. Luckily I’m holding tight to the steering wheel to keep myself from hitting someone.
How to read this page
Every figure comes from the National Highway Traffic Safety Administration's public complaint database, which holds every safety-related defect complaint filed by owners since 1995. We refresh it monthly and count each complaint once per component it names. Data through September 6, 2026.
NHTSA only accepts safety-related complaints. Rattles, paint, infotainment bugs and other annoyances are under-reported here, so this page is a map of what fails in ways owners consider dangerous, not a full reliability score.
Counts are raw. Use the year-over-year shape and the component mix, not the absolute numbers. Where a component maps to parts we stock, the row links to that category filtered to the year you are viewing. Air bag and seat belt complaints link to the recall checker instead, because those repairs are almost always covered.
Common questions
Which Kia K4 years have the most problems?
By NHTSA complaint volume, 2025, 2026 carry the most filings on the Kia K4. The 2025 alone has 45 complaints, led by unknown or other.
What is the most common Kia K4 problem?
On the 2025 model year, the most-reported component is unknown or other with 12 complaints. The table above lists the top components for every year.
At what mileage do Kia K4 problems start?
The median mileage at failure across all Kia K4 complaints that include mileage is about 29,000 miles. Older model years skew higher; the per-year figure is in the "at a glance" card.
Are these complaints verified?
No. NHTSA publishes complaints as submitted and does not investigate individual filings. Patterns across hundreds of complaints are meaningful; a single one is not.