2021 Kia K5 Fuel/propulsion System Problems
NHTSA component category: FUEL/PROPULSION SYSTEM · data through 07/14/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How fuel/propulsion system ranks on this vehicle
Share of the 154 complaints citing each category; one complaint can cite several. Full breakdown on the 2021 Kia K5 overview page.
What owners report
“My fuel tank expanded while I was driving on the highway, causing my car to stall and would not respond to me pushing on the…”NHTSA complaint 11675207 — filed 07/21/2025
“Expansion of air tank, causing to pop up frame in backseat and total car deemed unsafe to drive. No warnings car had never been in…”NHTSA complaint 11674722 — filed 07/19/2025
“Driving down highway, gas hand was on half a tank then all of a sudden gas hand drops to empty and light comes on, engine…”NHTSA complaint 11671235 — filed 07/04/2025
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Fuel/propulsion System complaints by year filed
Frequently asked questions
Does the 2021 Kia K5 have fuel/propulsion system problems?
Fuel/propulsion System is the #2 most-reported problem area on the 2021 Kia K5: 39 of 154 complaints on file (25.3%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2021 Kia K5 have in total?
154 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 7 involved a crash, 2 involved a fire, 7 reported injuries, and 1 reported deaths.
What does NHTSA's fuel/propulsion system category include?
NHTSA assigns each complaint to standard component categories; this page reports the FUEL/PROPULSION SYSTEM category exactly as NHTSA defines and records it.
