Early-build 2025 Kia K4 sedans have reported instrument panel failures and inoperable power sunroofs, which appear to be electrical or assembly-quality defects rather than normal wear. These issues have not become a widespread recurring defect, and JD Power gave the 2025 and 2026 K4 models a reliability score of 86. The likely consequence is the need for dealer repair, typically covered under warranty, but no independent out-of-pocket cost estimate is available.

Fewer than 30 early-production 2025 Kia K4 vehicles were recalled for loose engine bolts, which can cause engine noise, vibration, oil leaks, or potentially engine damage. This is a safety compliance recall, so repairs are performed at no charge to the owner. Affected owners should contact a Kia dealer for inspection and repair.