Kia K5 hesitation problems

Filed Aug 28, 2026 · Acceleration, Driver assistance · CO

I bought this vehicle less than 60 days ago and there is transmission hesitation, hard engagement in lower gears, Rough jerking shifting along with acceleration lag. Erracric shifting and phantom braking. I have taken it into the dealership I bought it at at they are not seeing anything. It currently is at another Kia dealership for the past two days. This vehicle is going to cause an accident that puts my safety and others at risk. There is no warning lights that come on. I have done my research and there has been other complaints from other consumers having the same issues. I do have video of in town driving but have not been on the highway

Filed Mar 18, 2026 · Electrical, Engine · CA

Shortly after a routine oil change performed at a Kia dealership, I discovered a significant oil leak underneath the vehicle the following day. Within a short period of time, the vehicle began experiencing engine-related issues including a cylinder misfire, noticeable shaking while driving, and loss of power, particularly when accelerating or driving on inclines. The vehicle also displayed a check engine light and a warning related to 12-volt battery drain. In addition, I noticed a strong burning odor coming from the engine area, which raised concerns about a possible fluid leak or internal engine issue. These conditions created a safety concern because the vehicle would hesitate and lose power during normal driving, which could increase the risk of an accident, especially in traffic or when merging or climbing inclines. The vehicle was returned to a Kia dealership for inspection. I was informed that a cylinder issue was suspected; however, only a temporary repair involving a coil swap was performed. No comprehensive diagnostic testing was completed to confirm the root cause of the problem. After the repair, the vehicle continued to exhibit abnormal behavior, including shaking and lack of power. Due to ongoing safety concerns and lack of confidence in the vehicle’s reliability, I stopped driving the vehicle. This issue occurred at relatively low mileage, raising concerns about a potential engine defect or unresolved mechanical failure.

Filed Jan 30, 2026 · Driver assistance · TX · crash

The car was in an accident with the previous owner I bout the car and the carfax showed rear end collision I told the car worked perfectly. After purchase the car brakes have built up 2 times in 5 months the car stalled it has rpm issues lagging and hesitation as well as the safety front end collision has malfunctioned and it locked my brakes up I did all the steps to try to fix it and I ended up having to disconnect the battery. I sent it to the dealer and they said it was fine I now see the carfax as showing front end collision was reported and has been in the shop multiple times for the hesitation and stalling issue which now that my blue certificated warranty is out they found the issue (pcv valve etc) I’ve asked for a remedy with the dealer and they won’t budge this car is a safety liability.

Filed Dec 22, 2025 · Fuel system · 77,000 miles · FL

The contact owns a 2023 Kia K5. The contact stated that while driving at various speeds, the check engine warning light intermittently flashed on the instrument panel. The contact used a code reader to diagnose the failure and received a code for a defective valve with an excessive amount of air. The contact then stated that while driving 80 MPH, there were three loud booming sounds coming from the rear end of the vehicle. The contact inspected the vehicle but found no external damage; however, the vehicle was hesitating while depressing the accelerator pedal. The contact then received a call from the dealer and was informed that the VIN was included in the federal safety agency Campaign Number: 25V794000 (Fuel System, Gasoline). The contact was instructed to bring the vehicle to the dealer for immediate service. The vehicle was taken to the dealer and remained with the dealer after the contact was informed that the vehicle had failed the recall inspection. The contact was provided a rental vehicle and was informed that he would be updated on what the manufacturer had decided about the vehicle. The contact called the manufacturer but had not yet received an update about the vehicle. The vehicle was not repaired. The failure mileage was approximately 77,000.

Filed Dec 17, 2025 · Engine, Fuel system · 103,000 miles · GA

The contact owns a 2022 Kia K5. The contact received notification of the federal safety agency Campaign Number: 25V794000 (FUEL SYSTEM, GASOLINE); however, the part to do the recall repair was unavailable. The local dealer was contacted, and it was confirmed that the part was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact experienced the failure, causing the check engine warning light to remain illuminated, and the vehicle hesitated while accelerating. The vehicle was taken to the local mechanic, who diagnosed the vehicle and determined that the check valve was faulty and needed to be replaced. The vehicle was not repaired. Additionally, the contact stated that while the AC was activated, one vent was blowing hot air while the other vent was blowing cold air. No further information was available. The failure mileage was 103,000.

Filed Dec 16, 2025 · Electrical, Engine · TX

The vehicle experiences severe stalling and loss of power while driving. When attempting to accelerate, the vehicle hesitates, shakes violently, and will not accelerate beyond approximately 10–20 mph. The vehicle then stalls completely and shuts off. These failures occur both after the vehicle has been parked and while actively driving. When placed in drive, the vehicle shakes aggressively and stalls. The check engine light is illuminated. The stalling has occurred multiple times in the middle of freeway traffic, creating an extreme safety hazard. My child has been in the vehicle during every occurrence. On one occasion, the vehicle shut off completely while on the freeway, placing our lives at risk and nearly resulting in a serious collision. This issue is unpredictable, persistent, and prevents safe operation of the vehicle. The vehicle has been inspected and worked on by Southwest Kia and A-Z Auto, but the defect continues to occur. I believe this is a manufacturing or design defect related to the engine or powertrain that poses a serious safety risk and should be investigated to determine whether other vehicles are affected.

Filed Oct 28, 2025 · Engine, Fuel system · VA

10/25 I was traveling, and my car sudden loss of power, while in traffic.. almost causing accident. 10/28 I was traveling on interstate, and my car sudden loss of power, while in traffic.. almost causing accident. This is ridiculous.. When I hit the gas sometimes, feels like it fluttering and jerking. I’ve reported multiple times over the years and this one having hesitation when driving this car. Manager drove it was concern, mechanic talking about it’s the way the car supposed to be.

Filed Apr 24, 2025 · Engine, Fuel system · NJ

The vehicle has experienced repeated transmission-related issues, including erratic shifting, delayed response, slippage, and sudden loss of power while driving. These symptoms significantly impact drivability and pose a safety risk, especially when accelerating or merging in traffic. The issue was previously addressed by the dealership under a recall repair. However, the same transmission behavior has returned approximately 3–4 months after the repair. The dealership performed repairs multiple times before, and the symptoms have now recurred. The problem has been confirmed by the authorized dealership and is scheduled for another inspection. There have been warning symptoms such as hesitation during gear shifts and intermittent power dips while in motion, which began reappearing recently. The component remains available for inspection. Given the repeat nature of the issue following an official recall, I believe this may be part of a broader unresolved defect in the vehicle’s transmission system. The issue initially reappeared briefly after the recall repair, then subsided. However, it returned more consistently and noticeably after a couple of months, and is now ongoing.

Filed Aug 21, 2024 · Transmission · WV

Transmission is itself in neutral while driving. Resulting in irratic RPMs, hesitating acceleration and rough transition to gears. Took care into dealership service department. They seemed that I would need a transmission replacement. Kia approved the request. Still waiting on transmission to be put in.

Filed Aug 14, 2024 · Transmission · 34,000 miles · FL

The contact owns a 2023 Kia K5. The contact stated that while driving on several occasions at various speeds, while the transmission was changing gear, the vehicle hesitated and jerked abnormally. The vehicle was taken to a dealer however, the failure could not be replicated. The manufacturer was notified of the failure. The failure mileage was approximately 34,000.