EngineMedium
1.6L/2.5L turbo oil consumption and rare bearing issues.
- Typically appears
- 50,000+ miles
- What to inspect
- Check oil level and confirm any engine recall completion.
2021–2024 Kia K5 · common problems & known faults
The K5 (formerly Optima) is a sharp midsize sedan. It's reliable but the turbo engines warrant a used-car check.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed July 2026
Quick answer
The most commonly reported faults on the 2021–2024 Kia K5 are 1.6L/2.5L turbo oil consumption and rare bearing issues, 8-speed DCT on turbo can hesitate at low speed and Infotainment reboots and USB/charging faults. Most reported issues are medium or low severity, but a pre-purchase inspection is still recommended. Full inspection points, onset mileage and what to check are listed below.
Reliability snapshot
Based on the documented faults on this page for the Kia K5.
8.5/ 10
- Critical
- 0
- High
- 0
- Medium
- 2
- Low
- 2
Guidance only · reflects reported patterns, not a specific car's condition.
Kia K5 problems by year
Which faults an average example has usually reached depends on its age. Pick a model year for the faults that matter on that build.
Known faults to check
TransmissionMedium
8-speed DCT on turbo can hesitate at low speed.
- Typically appears
- Any
- What to inspect
- Test-drive slow-speed take-up for jerkiness.
ElectricalLow
Infotainment reboots and USB/charging faults.
- Typically appears
- Any
- What to inspect
- Test the touchscreen and charging ports.
BrakesLow
Front pad wear on city cars.
- Typically appears
- 40,000+ miles
- What to inspect
- Inspect pad thickness.
Inspecting a Kia K5?
Generate a full, tickable pre-purchase checklist tailored to this exact vehicle · add photos and notes as you inspect. Try it free.
Check this exact carFrequently asked questions
Is the Kia K5 reliable?
Yes overall — check the turbo engine's oil use and the dual-clutch feel.
Does the K5 have transmission problems?
The DCT can hesitate; a careful test-drive will reveal it.
What should I check on a used K5?
Engine oil use, DCT smoothness and infotainment.
Sources & further reading
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.