Engine complaints by model year
Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
Mileage when the problem started
What owners report
The contact owns a 2026 Kia K5. The contact stated that after starting the vehicle, the engine immediately started to rev extremely high, and smoke was coming from under the hood, and the front passenger side lights failed to illuminate. There was a sizzling sound coming from the engine compartment, and the hood was very hot to the touch. The contact turned off the vehicle, and a tow truck company was contacted. The contact stated that while raising the vehicle onto the tow truck, hundreds of shards of black plastic fell from the vehicle onto the driveway along with a pink colored liquid. The vehicle was towed to the local dealer. The cause of the failure was not yet determined. The manufacturer was not yet contacted. After the failure, the contact received several engine failure codes on the Phone App. No further information was available. The failure mileage was 110.
The contact owns a 2026 Kia K5. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed with an engine harness failure. The contact was informed that the engine harness needed to be replaced. The vehicle was not repaired. The contact was informed that the parts were ordered and would be delivered within a week. The manufacturer was made aware of the failure. The contact was informed that the dealer would be contacted. The failure mileage was approximately 89.
The contact owns a 2025 Kia K5. The contact stated that the engine made an abnormally loud sound while driving and idling. The vehicle was taken to the dealer several times, but the failure could not be duplicated. The vehicle was taken to the dealer, where it was diagnosed that the tensioner and the pulley were worn out and needed to be replaced. The vehicle was repaired; however, the contact stated while driving 55 MPH six days later, the service, the battery, the low-pressure oil warning lights, and several other unknown warning lights were illuminated. The contact stated that the steering wheel and the brakes locked, causing the contact to lose control of the vehicle. The vehicle then stalled in the middle of the road. The contact stated that the vehicle that was behind swerved to avoid hitting the contact's vehicle and unexpectedly crashed into another vehicle. …
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 driving on the expressway and the engine made a noise and I lost power. I was in the left lane of the expressway. I did not have any warning lights or signs or symptoms prior to this incident. No oil ever leaked prior to this incident. When it occurred, oil was pouring out of the engine all over the ground. The engine was smoking. And a warning message came across the entertainment screen that said, "A possible condition with your engine control system has been detected, recommend service soon" I never received any notification of any oil pressure loss, oil loss, warning lights, nothing. My car has been at the dealership for over 60 days, and KIA is refusing to cover the engine under warranty, blaming an oil change place that did an oil change over a month prior to this incident, and I drive 100 to 200 miles per day for work, so this would have occurred sooner. …
The contact owns a 2024 Kia K5. The contact stated while driving 80 MPH, the vehicle lost motive power. The contact stated that several unknown warning lights were illuminated. The vehicle was restarted; however, the failure recurred. The vehicle was taken to the dealer but was not diagnosed. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 12,780.
The contact owns a 2023 Kia K5. The contact stated while making a turn from a complete stop, the check engine warning light and several other unknown warning lights illuminated. The message "A possible condition with your engine control system has been detected" was displayed on the infotainment screen display. The accelerator pedal was depressed, but the vehicle failed to respond as needed. The contact was able to drive back to her nearby residence at a significantly slow speed. The vehicle was towed to the dealer, where the failure could not be replicated. The contact stated that the vehicle operated as needed; however, the failure recurred while making a left turn in a parking lot. The vehicle was towed to the dealer, where it was diagnosed that the throttle body had failed and needed to be replaced. The vehicle was repaired; however, the failure persisted. …
The contact owns a 2023 Kia K5. The contact stated that upon purchasing the vehicle new and driving off the dealer lot, the message "Radar Sensor Blocked" was displayed. The dealer was informed but no assistance was provided. The vehicle was driven to the residence. The contact stated that another message indicating that a sensor was blocked was displayed, and the check engine warning light was illuminated. The vehicle was taken to the dealer, where it was diagnosed and determined that the engine had imploded. The vehicle was not repaired. The manufacturer was notified of the failure and a case was filed. The manufacturer offered buyback assistance; however, the dealer had not returned the owner's or the manufacturer's calls. The failure mileage was approximately 74.
NHTSA investigations
Loss of Motive Power
The National Highway Traffic Safety Administration (NHTSA) received a letter dated July 13, 2022, petitioning the Agency to initiate a safety defect investigation into loss of motive power allegations attributed to oil drain pan assembly failures on certain Hyundai Motor America, Inc. and Kia America, Inc. vehicles spanning Model Years (MY) 2005-2021.
Frequently asked questions
Which Kia K5 years have engine problems?
By NHTSA complaints, the 2021 (32), 2022 (30), 2023 (13), 2024 (9) and 2026 (5) model years. Engine complaints make up 19% of all complaints for the 2021.
Is there a recall for Kia K5 engine problems?
No. NHTSA lists no engine & cooling recall for any Kia K5 model year. A widespread problem may still be covered by an extended warranty or a manufacturer service bulletin, so ask a dealer.
At what mileage do Kia K5 engine problems start?
Across all years, half of the complaints with a recorded mileage happened before about 41,000 miles; 62% happened before 50,000 miles.
What part fails most often?
Owners most often name the exhaust system › emission control › gas recirculation valve (egr valve) (1 mentions).
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.