GarageCalc What the data says
Fuel/propulsion system accounts for about 30% of this year's Kia K5 complaints. That is a moderate concentration; worth knowing, but complaints are spread across several areas.
The 2021 model year contributes 35 complaints (27%). No single model year dominates, so this looks like a line-wide pattern rather than one bad year.
Complaints are up year over year, 94 to 128 (+36%), against a market that rose about 2%. Year-over-year movement is the most useful signal here: a model's sales are roughly stable from one year to the next, so a sharp rise means the per-vehicle complaint rate genuinely moved, not just that the model is popular.
How to read this
Raw complaint totals track how many Kia K5s are on the road as much as they track quality, so a high count on a best-seller is partly a volume story. Complaints are also self-reported: they capture what owners chose to file, not a controlled survey. Use these numbers to know where to look during a pre-purchase inspection and which recalls to check, not as a verdict on their own. Compare any car instantly in the Car Complaint Checker, or read the full 2026 study for the market-wide picture and methodology.
Frequently asked questions
Is the Kia K5 reliable?
Complaint counts alone cannot answer that, because they track how many are on the road as much as build quality. What the 2026 data shows: 128 NHTSA complaints so far (rank 99 of 765 models), +36% year over year, with fuel/propulsion system the most-cited area. Treat it as a starting point and cross-check recalls and a pre-purchase inspection for the specific vehicle.
What is the most common Kia K5 complaint?
Fuel/propulsion system: 39 of the 128 complaints filed in 2026 cite it (about 30%). That is a moderate concentration; worth knowing, but complaints are spread across several areas.
Which Kia K5 model year has the most complaints?
The 2021 model year, with 35 of this year's 128 complaints (about 27%). No single model year dominates, so this looks like a line-wide pattern rather than one bad year.
Source: NHTSA Office of Defects Investigation complaint database, complaints received 2026-01-01..2026-08-24, compared with 2025-01-01..2025-08-24 (same window). Counted once per complaint ID, vehicles only. Aggregated data is available under CC BY 4.0 with a link to GarageCalc.