Is the 2021 Kia K5 a bad year?
170 owner complaints to NHTSA. Engine and transmission complaints are in line with other K5 years.
Keep it
Engine and transmission complaints for the 2021 Kia K5 are in line with other K5 years. Fuel system stands out for this year: see below.
The verdict moves with mileage: the same car reads differently at 30,000 and at 150,000 miles.
What 2021 K5 owners report, by mileage
Each system owners named in five or more complaints, with the mileage range where the middle half of those complaints were filed. Read at 90,000 miles.
| SYSTEM | COMPLAINTS | MIDDLE HALF FILED AT | TYPICAL US REPAIR BILLS |
|---|---|---|---|
| Fuel systemSTANDS OUT | 58 (34%) | 80k–115k miles · around this mileage | Fuel pump replacement $220–$1,500 · Fuel injector replacement (one injector) $300–$1,200 |
| Electrical system | 46 (27%) | too few with a mileage | — |
| Engine | 32 (19%) | too few with a mileage | — |
| Transmission and drivetrain | 19 (11%) | too few with a mileage | — |
| Air bags | 10 (6%) | too few with a mileage | — |
| Body structure | 10 (6%) | too few with a mileage | — |
| Brakes | 10 (6%) | too few with a mileage | — |
| Collision avoidance | 9 (5%) | too few with a mileage | — |
| Lane assist | 9 (5%) | too few with a mileage | — |
| Seats | 8 (5%) | too few with a mileage | — |
| Steering | 7 (4%) | too few with a mileage | — |
| Visibility and wipers | 5 (3%) | too few with a mileage | — |
Bills are typical US ranges from the sources named in the tool (J.D. Power, Kelley Blue Book, CarParts.com and others), printed only for systems that stand out or sit at or ahead of 90,000 miles. Not a quote.
What owners reported alongside their complaints
Of 170 complaints: 8 mention a crash · 2 mention a fire · 6 report an injury · 13 say the car was towed.
52 complaints were filed in the last 12 months, the newest in Nov 2026.
Counts of what owners wrote in their complaints, not verified by anyone.
Recalls for the 2021 Kia K5: 6
A damaged check valve can allow air to enter the fuel tank, causing it to expand and contact hot exhaust components, melting the tank. A melted fuel tank can leak, increasing the risk of a fire.
The side curtain air bags may have been installed incorrectly, causing them not to deploy properly in the event of a crash. Air bags that do not deploy as intended can increase the risk of injury in a crash.
The vehicle's "fail-safe" limited-mobility drive mode may be impaired, when prompted by a transmission oil pump malfunction, which can result in a complete loss of drive power. Loss of drive power increases the risk of a crash.
Fuel may leak at the pipe connection between the high-pressure fuel pump and fuel rail. A fuel leak increases the risk of a fire.
The Rack-Mounted Motor Driven Power Steering (R-MDPS) system lacks the ability to diagnose communication faults. A sudden increase in steering effort can increase the risk of a crash.
The Occupant Classification and Detection System (OCS/ODS) unit may not detect the presence of a child restraint system in the front passenger seat. In the event of a crash, deployment of the front passenger air bag, with a child in that seat, can increase the risk of injury to the child.
A recall may cover only some cars of a model year; the campaign size counts every model and year it lists. Enter your VIN at nhtsa.gov/recalls: dealers fix open recalls free.
Service bulletins from Kia: 83
Repair instructions Kia sent its dealers for symptoms seen in the shop on the 2021 Kia K5. Ask a dealer or mechanic for a bulletin by its number.
Itm replacement and ECM logic improvement (CA2511)
Precautions for transmissions with isg/eop
8-SPEED dual clutch transmission eop sensorless logic improvement
4WD coupling noise inspection and snap ring replacement
Neighbouring years
2022 K5: 130 complaints, keep it.
Every Kia K5 year
2021 · 2022 · 2023 · 2024 · 2025 · 2026 · All K5 years side by side
Other Kia models: Kia Amanti · Kia Cadenza · Kia Carnival · Kia EV6 · Kia EV9 · Kia Forte · Kia Niro · Kia Optima · Kia Optima Hybrid · Kia Rio · Kia Rondo · Kia Sedona · Kia Seltos · Kia Sephia · Kia Sorento · Kia Soul · Kia Spectra · Kia Sportage · Kia Stinger · Kia Telluride. All makes and models.
Questions
Is the 2021 Kia K5 a bad year?
170 owner complaints to NHTSA. Engine and transmission complaints are in line with other K5 years. At 90,000 miles the tool says: Keep it.
What are the most common problems with the 2021 Kia K5?
By owner complaints to NHTSA: fuel system (58), electrical system (46), engine (32), transmission and drivetrain (19), air bags (10).
How many recalls does the 2021 Kia K5 have?
6 recall campaigns list this model year: Fuel system (NHTSA 25V-794), Air bags (NHTSA 23V-149), Transmission and drivetrain (NHTSA 22V-760), Fuel system (NHTSA 21V-519) and more. A recall may cover only some cars; check by VIN at nhtsa.gov/recalls.
Method: counts of unverified owner complaints filed with NHTSA, compared only with other years of the same model (sales volumes are unknown, so no failure rate is computed). A system stands out at 40+ complaints and at least twice the model's quiet (lower-quartile) year, or twice the share across every vehicle of that model year. The mileage range is the 25th to 75th percentile of the mileages owners reported. Data received by NHTSA through November 5, 2026. Repair prices are typical US ranges from named sources, not quotes. Not a diagnosis and not financial advice. PulsCar is not affiliated with NHTSA. Check this car at your own mileage.