2021 Kia K5 Problems: 24 Issues Every Owner Should Know
2021 model year · 1,951+ owner reports · Updated May 2026
According to Au7o's analysis of 1,951+ owner reports, the 2021 Kia K5 has 24 documented known issues, with 9 rated critical. The most serious are 8-Speed DCT Electric Oil Pump Failure ($0-$0 repair), Fuel Tank Expansion and Fire Risk ($0-$0 repair), Battery Drain / No-Start After Sitting (Telematics/Module Sleep Issue) ($180-$1,200 repair), Forward Collision Avoidance Assist (FCA) Phantom Braking Events, SmartStream G2.5 GDI Engine Piston Ring/Oil Consumption Issue, Electronic Parking Brake (EPB) Warning / Auto-Hold Malfunction ($180-$900 repair), Rear Wheel Bearing Premature Failure and Humming Noise ($250-$650 repair), Transmission Control Unit (TCU) Software Fault Causing Harsh Upshifts or Limp Mode (8-Speed AT) and Windshield Optical/Rain Sensor Bracket Detachment (ADAS/Auto Wipers Inoperative) ($250-$1,400 repair). The most commonly reported issue is with 345 owner reports. Across all issues, repair costs range from $10 to $2,000. at .