The contact owns a 2026 Kia K4. While driving 37 MPH, the vehicle lost motive power. After restarting the vehicle, the failure persisted, and the message "Press Engine Start/Stop" was displayed with the key warning light illuminated. The following night, the contact started and then turned off the vehicle; however, the vehicle restarted independently without the Engine Start/Stop button being pressed. The vehicle was towed to the dealer but was not yet diagnosed. The manufacturer was notified by phone, and a case was filed. The failure mileage was 25,352.
Engine & cooling
2026 Kia K4 Engine problems
Owners have filed 1 complaint about the 2026 Kia K4's engine & cooling with NHTSA - 8% of all its complaints, most recently on October 8, 2026. Stalling, loss of power, oil consumption, overheating, head gaskets, timing chains and engine failure.
- Complaints
- 1
- Recalls
- 0
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
Engine complaints
Kia K4 engine complaints by year
K4 engine problems, every yearSource: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data