Kia K4
Kia · Carros · 2025
Kia K4
86
25 complaints
status.verdict
status.safe
status.safe_sub
product.specifications
specs.g_fuel_economy
specs.city_mpg26
specs.highway_mpg36
specs.combined_mpg29
specs.annual_fuel_cost$2350
specs.ghg_score6 / 10
specs.g_engine_drivetrain
specs.engine_size1.6 L
specs.cylinders4
specs.fuel_typeRegular
specs.transmissionAutomatic (S8)
specs.drivetrainFront-Wheel Drive
CO₂303 g/mi
specs.g_classification
specs.vehicle_classMidsize Cars

specs.data_sourced_from FuelEconomy.gov (specs.energy_dept)

product.complaints_section25 total
KIA K4 2025 FORWARD COLLISION AVOIDANCE: WARNINGS
high
Vehicle's forward collision warnings did not sound. Airbags did not deploy. Vehicle in front end collision at 40mph
NHTSAUSMay 2026Source →
KIA K4 2025 LANE DEPARTURE: ASSIST
high
The warnings on the car all failed and I was lead off the road while going on a roundabout. This has trigged my car to completely lose all control and even though I was attentive to my steering wheel I still didn’t stop the car from leading me to that curb and off road onto grass etc.
NHTSAUSMay 2026Source →
KIA K4 2025 FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL
low
To whom this may concern, I was using my cruise control on my way to work. I usually set it to 80 because police are okay with that speed on I-75. I braked before my automatic brakes hit after I got cut off. I pressed resume in the cruise control and it accelerated pretty quick. I’ve experienced that quite a bit, but there’s been a few times that the car exceeded the set cruising speed while trying to resume. I forget it happens because it’s happened about 4 times since purchasing the vehicle. I noticed an officer on the shoulder leaving the shoulder as I got closer, and he got right behind me and cut his lights on, I look down and the cruise control shows 80 above the speedometer (photo attached taken while pulled over), BUT the arm was past the tick for 90. The officer clocked me at 92 apparently. This is the only time this issue has occurred, and I informed the officer that this happens. I have a court date set for July 9th now. I Googled to see if other owners have this problem. There are others who expressed experiencing this in their K4s and K5s. The AI tool explained the following • "Resume" Behavior: When you press the resume button, the car attempts to get back to 80 mph as quickly as possible. This aggressive acceleration can cause it to temporarily overshoot the target speed before settling down. • Settings Sensitivity: The acceleration strength and reaction speed can be set to "Fast" in your infotainment system, causing more aggressive throttle input.
NHTSAUSMay 2026Source →
KIA K4 2025 AIR BAGS
high
I was hit on the driver side of the car infront of the driver door side of the hood and it took out my wheel and the car is totaled with how hard the hit was made my car bounce but the air bags never deployed and the fireman and the police officer said with as hard as I was hit it should have deployed
NHTSAUSApr 2026Source →
KIA K4 2025 ENGINE
low
As I entered onto i4 reaching the speed of 60 miles an hour my vehicle began to make a high pitched whining noise that got louder as I pressed on the gas pedal, noise dissipated when I let off the gas pedal. Vehicle began to slow down on its own , even when applying pressure to the gas pedal, I had no choice but to pull over on i4, error message displayed “RED CAUTION EMBLEM” error message “Transmission Control Unit” Kia k4 app displayed Diagnostic Alert AT PO72200
NHTSAUSApr 2026Source →
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product.status_history
status.certifiedstatus.safe1 Jun 2026
Lemon Score: 89. 12 data points. v3 scoring.
status.uncertainstatus.certified31 May 2026
Lemon Score: 91. 9 data points. v3 scoring.
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