Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2026 K4.
The 2026 Kia K4 is a sedan equipped with an eight-speed automatic transmission and achieves EPA-estimated fuel economy of 26 mpg in the city, 33 mpg on the highway, and 28 mpg combined, positioning it competitively within its segment for efficiency; reliability data for this model year shows a total of six owner complaints filed, with forward collision avoidance emerging as the most frequently cited concern alongside a single recall, suggesting that while early reliability indicators are relatively clean, prospective buyers should monitor this model's performance trajectory as more long-term data becomes available.
Fluid capacities, tune-up values and fuel economy at a glance.
Engine, drivetrain, dimensions and economy.
| Transmission | Automatic (S8) |
| Overall length | 185.4 in |
| Overall width | 72.8 in |
| Overall height | 55.9 in |
| Wheelbase | 107.1 in |
| Curb weight | 2954 lb |
| Track (front / rear) | 62.2 / 62.6 in |
| Weight distribution (front / rear) | 61/39 |
| EPA city / highway / combined | 26 / 33 / 28 mpg |
| Drivetrain | Front-Wheel Drive |
| Passenger volume | 99 cu ft |
| Cargo volume | 15 cu ft |
| Recommended fuel | Regular Gasoline |
0–60 mph, quarter-mile, horsepower and torque from independent road tests.
Independent road tests for the K4 of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.
| Year | Trim / engine | 0–60 | ¼ mile | HP | Drivetrain |
|---|---|---|---|---|---|
| 2025 | GT-Line Turbo 1.6L Turbo I-4 | 6.70 sec | 15.30 sec | 190 hp | FWD |
| 2025 | GT-Line Turbo 1.6L Turbo I-4 | 7.10 sec | 15.50 sec | 190 hp | FWD |
| 2025 | GT-Line Turbo 1.6L Turbo I-4 | 7.30 sec | 15.70 sec | 190 hp | FWD |
| 2025 | LXS 2.0L I-4 | 8.10 sec | 16.20 sec | 147 hp | FWD |
| 2025 | GT-Line 2.0L I-4 | 9.10 sec | 17.00 sec | 147 hp | FWD |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
The 2026 Kia K4 carries a cleaner federal record than its 2025 predecessor across every tracked metric: complaints fell from 42 to 6, recalls from 2 to 1, and TSBs from 18 to 6, with no NHTSA investigations in either year. That downward arc suggests the second model year on record has generated materially less owner-reported and manufacturer-acknowledged activity, though the two-year window is short. The 2026 complaints are spread thinly across single reports for forward collision avoidance, unknown/other, tires with lane departure, and steering with lane departure, so the data does not point to a common root cause or concentrated defect. Three of the six complaints involve crashes, but the filings do not specify whether the crashes were caused by a vehicle fault or external factors. With zero fire complaints and only one recall, the 2026 K4 looks relatively benign on paper. For a buyer weighing this model year, the 2026 K4 appears to be the better bet of the two years shown, provided a pre-purchase inspection still confirms the single recall has been addressed.
All 6 complaints on record, top 6 components.
Source: NHTSA Office of Defects Investigation complaint database.
Showing 1 of 1 campaigns on record for this vehicle.
Kia America, Inc (Kia) is recalling certain 2027 Kia Telluride and 2026 Kia K4 vehicles. The rear center seat belt anchor buckle in the 2026 K4 and the third-row center seat belt anchor buckle in the 2027 Telluride may… Remedy: Dealers will inspect and replace the anchor buckle assembly, as necessary, free of charge. Owner notification letters were mailed May 5, 2026. Owners may contact Kia at…
Showing 5 of 6 bulletins on record with NHTSA.
| Bulletin | Date | Component | Summary |
|---|---|---|---|
| TSB_ELE422 | 2026-05-27 | Electrical System | TECHNICAL SERVICE BULLETIN: INFOTAINMENT SYSTEM SOFTWARE UPDATE USING UPDATE.KIA.COM… |
| TSB_ELE414 | 2026-04-28 | Electrical System | TECHNICAL SERVICE BULLETIN: BODY DOMAIN CONTROLLER (BDC) REPLACEMENT (CA2515) - This… |
| TSB_ELE417 | 2026-04-14 | Electrical System | TECHNICAL SERVICE BULLETIN: INFOTAINMENT SOFTWARE UPDATE PROCEDURE - This bulletin… |
| TSB_ELE413 | 2026-03-20 | Electrical System | TECHNICAL SERVICE BULLETIN: DCU COMMUNICATION LOGIC IMPROVEMENT - This bulletin provides… |
| TSB_ENG261_R1 | 2026-02-10 | Engine | TECHNICAL SERVICE BULLETIN: DATA COLLECTION: EXTRACT CALIFORNIA EMISSIONS DATA FROM ECU… |
The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.
Decode factory build data for a specific vehicle by VIN.
Cross-vehicle references for the kinds of data on this page.
NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.
EPA figures are 26 city / 33 highway / 28 combined mpg.